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Clinical Updates
Vitamin D Supplements
Plant-Based Calcium?
November 11, 2024
Are algae-based forms of calcium (such as AlgaeCal and Aquamin) any better than other forms of calcium, and is one of these better than the other? Find out in the ConsumerTips section of our Calcium Supplements Review, which includes our Top Picks among calcium supplements.
Keeping Up Vitamin D
October 24, 2024
With less daylight now in the Northern Hemisphere, it's a good time to consider ways to keep vitamin D levels up. In addition to supplements, foods like salmon can help – but how and when you consume these can make a big difference, as shown in a recent study. For details, see the Getting Vitamin D From Foods section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Also see our Top Picks among canned and packaged fish products, including salmon.
Vitamin D to Prevent Winter Colds & Flu?
September 26, 2024
Does taking vitamin D help prevent respiratory infections during winter? Find out what a recent study showed in the Respiratory infections, colds and influenza section of our Vitamin D Supplements Review, which includes our Top Picks.
Vitamin D for Vertigo?
September 03, 2024
Taking vitamin D may prevent the recurrence of episodes of a common form of vertigo known as benign paroxysmal positional vertigo (or BPPV), according to a recent study. Get the details in the Vertigo section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Vitamin D for Restless Legs?
August 12, 2024
Did taking vitamin D reduce the severity of restless legs syndrome in women? See what a recent study found in the Restless legs syndrome (RLS) section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Exercise and Vitamin D
August 12, 2024
Be aware that exercise may temporarily raise blood levels of vitamin D, according to a recent study. Learn more and how this might affect timing of blood tests for vitamin D in the ConsumerTips section of our Vitamin D Supplements Review.
Vitamin D for Asthma?
May 21, 2024
Does high-dose vitamin D improve asthma? Find out what a recent study showed in the Asthma section of our Vitamin D Supplements Review, which includes our Top Picks.
Vitamin D & Age
April 16, 2024
Do older people produce less vitamin D from sunlight than younger people? Find out in the ConsumerTips section of our Vitamin D Supplements Review, which explains who is most likely to have low levels of vitamin D. Also see our Top Picks among vitamin D supplements.
Vitamin D & Prostate Cancer-Related Bone Loss
March 29, 2024
Taking high-dose vitamin D during androgen deprivation therapy for prostate cancer may help some men prevent bone loss, according to a recent study. Get the details in the Prostate Cancer section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Vitamin D for ED?
March 19, 2024
Did taking vitamin D improve sexual function among older men? Find out what a recent study showed in our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Back Pain & Vitamin D
March 15, 2024
Are low levels of vitamin D linked with increased risk of lower back pain? See what a recent study found in the Bones and fractures section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Vertigo
February 23, 2024
Taking vitamin D may reduce episodes of vertigo in certain people. Get the details in the What It Does section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Vitamin D & Menopause
February 21, 2024
Does vitamin D supplementation affect the time of menopause onset? See what a recent study showed in the Early Menopause section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Crohn’s Disease, Colitis & Key Nutrients
February 13, 2024
Experts are advising that people with inflammatory bowel disease, including Crohn’s disease and ulcerative colitis, be monitored for deficiencies in vitamin D and iron.
Also see our Top Picks among vitamin D and iron supplements.
Also see our Top Picks among vitamin D and iron supplements.
Vitamin D For Cough & Colds?
January 05, 2024
Does taking vitamin D prevent upper respiratory infections, including colds and coughs, in older people? Find out what a recent study showed in our Vitamin D Review, which includes our Top Picks for vitamin D.
Also see: Do any supplements help prevent or treat a cold?
Also see: Do any supplements help prevent or treat a cold?
Vitamin D & Multiple Sclerosis?
December 22, 2023
Having low blood levels of vitamin D may be a risk factor for multiple sclerosis (MS), but does taking vitamin D help? See what a new study found in the Multiple Sclerosis section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Also see our article about supplements for multiple sclerosis.
Also see our article about supplements for multiple sclerosis.
Vitamin D & Statin Side Effects
December 18, 2023
Does taking vitamin D prevent or reverse statin-related muscle symptoms? Find out what a recent study showed in the Statins section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Vitamin D for Thyroid Disease?
November 21, 2023
Does taking vitamin D improve thyroid function in women with Hashimoto’s thyroiditis? See what a recent study found in the What It Does section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Also see: I take levothyroxine (Synthroid), a thyroid hormone to treat hypothyroidism. Are there supplements or foods I should avoid, or be taking?
Also see: I take levothyroxine (Synthroid), a thyroid hormone to treat hypothyroidism. Are there supplements or foods I should avoid, or be taking?
Vitamin D for Knee Pain?
October 03, 2023
Does taking vitamin D reduce knee pain or improve function in people with knee osteoarthritis? See what a recent study suggests in the Osteoarthritis section of our Vitamin D Supplements Review, which includes our Top Pick for vitamin D.
Also see: Which supplements help with arthritis?
Vitamin D for Strength?
September 26, 2023
Does supplementing with vitamin D during winter improve strength among people with low levels of vitamin D? Find out what a recent study showed in the Strength and muscle function section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Gingivitis?
September 19, 2023
A recent study showed that taking vitamin D reduced gum inflammation. Get the details in the Periodontal disease section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
How Much Sun for Vitamin D?
September 15, 2023
How much time in the sun is required to maintain adequate vitamin D levels in the winter versus the summer? Find out in the Getting vitamin D from sunlight section of our Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
Vitamin D for Cancer?
September 12, 2023
Does supplementing with vitamin D improve survival for people with solid tumors and low levels of vitamin D? See what a recent study showed in the Cancer section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for GI Cancers
August 25, 2023
Taking high-dose vitamin D greatly improved the outcomes of a large subgroup of people with gastrointestinal cancers (colorectal, gastric, esophageal). Get the details in the Cancer section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D & COVID-19
August 15, 2023
Did supplementing with vitamin D reduce symptoms or improve outcomes among people hospitalized with COVID-19? Find out what a recent study showed in our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Also see if zinc helped in the same study.
Vitamin D and Doxycycline
July 18, 2023
Should I take vitamin D when on doxycycline (used to treat Lyme disease)? Read why you may want to supplement with vitamin D if you’re on a long course of treatment with a medication that causes photosensitivity, such as doxycycline.
Vitamin D for Strength?
June 27, 2023
Does supplementing with vitamin D improve strength and muscle function among older men and women with slightly low or adequate blood levels of vitamin D? Find out what research suggests in the Strength and muscle function section of our Vitamin D Supplements Review.
Also see our Top Picks for vitamin D.
Vitamin D & Diabetes Risk
June 23, 2023
In people with prediabetes, does taking vitamin D improve blood sugar regulation and decrease diabetes risk? Find out what a recent study showed in the Diabetes, insulin resistance and glucose control section of our Vitamin D Supplements Review.
Also see our Top Picks for vitamin D.
Vitamin D & Grave’s Disease
June 02, 2023
Did high-dose vitamin D improve outcomes in people with Grave’s disease? See what a recent study found in the What It Does section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for ED?
May 19, 2023
Does taking vitamin D improve the effects in men of prescription medication for ED? Find out in the What It Does section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Prenatal Vitamin D
April 21, 2023
Does taking vitamin D during pregnancy help prevent asthma in offspring? Find out in the Asthma section of our Vitamin D Supplements Review.
Also see our Top Picks for vitamin D.
MS and Vitamin D
April 18, 2023
Does vitamin D supplementation reduce relapse rates in people with multiple sclerosis? See what a recent study found in the What It Does section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Also see: Supplements for multiple sclerosis (MS): Do any supplements reduce symptoms or relapse?
Vitamin D for Psoriasis?
April 04, 2023
Did vitamin D supplementation decrease symptoms in people with plaque psoriasis? See what a new study found in the What It Does section of our Vitamin D Supplements Review.
Also see our Top Picks for vitamin D.
Vitamin D Cream?
March 14, 2023
Can you absorb vitamin D if applied to the skin as a cream? Find out what research suggests in the Topical Vitamin D section of our Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
High-Dose Vitamin D & DNA Damage
February 24, 2023
High-dose vitamin D supplementation may damage DNA, according to a recent study. Get the details in the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Urinary Symptoms?
February 17, 2023
Does taking vitamin D reduce frequent urination and other lower urinary symptoms in men with low levels of vitamin D? See what a recent study found in the What It Does section our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Also see: 9 Supplements That May Help Reduce Nighttime Urination (And 4 That May Not)
Vitamin D & Cognition
February 03, 2023
Does taking vitamin D improve cognition or slow cognitive decline among older people with already sufficient blood levels of vitamin D? Find out what a recent study showed in the What It Does section of our Vitamin D Supplements Review.
Also see our CL Answer about supplements, foods and lifestyle modifications for brain function.
Vitamin D and Risk of Death
January 17, 2023
Taking a large, monthly dose of vitamin D was associated with a 29% increase in the risk of death in older men and women, according to a recent study. Get the details in the How Much Is Too Much section of our Vitamin D Supplements Review, which explains additional risks of getting too much vitamin D, as well as how much is needed.
More Vitamin D in Cereals
January 10, 2023
Be aware that more vitamin D can now be added to breakfast cereals and nutrition bars based on a recent FDA ruling. Get the details in the What to Consider When Buying section of our Vitamin D Supplements Review.
Vitamin D and Mild Cognitive Impairment
December 23, 2022
Did high-dose vitamin D supplementation improve cognition in older men and women with mild cognitive impairment? See what a recent study found in the Cognitive Decline section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Also see our article about supplements and lifestyle modifications for improving memory and cognition.
Vitamin D & Statin-Related Muscle Pain
November 29, 2022
Does taking vitamin D reduce the risk of statin-related muscle pain? Find out what a recent study found in the Statins section of our Vitamin D Supplements Review.
Also, see our article about supplements to take or avoid when taking statins.
Vitamin D & Depression
November 25, 2022
Find out if and when taking vitamin D may possibly help or worsen depression in some people, including findings from a recent study. Get the details in the Depression & Mood section of our Vitamin D Supplements Review.
Statins & Vitamin D
November 18, 2022
Can taking vitamin D reduce statin-related muscle pain? See what a recent study found in the What It Does section of our Vitamin D Supplements Review.
Also, see our article about supplements to take or avoid when taking statins.
Vitamin D for Gum Disease?
October 25, 2022
Does supplementing with vitamin D help treat gum disease? Find out what research suggests in the Periodontal Disease section of our Vitamin D Supplements Review.
Also, see our article about supplements for gum disease or periodontitis.
Sunscreen & Vitamin D Deficiency?
October 07, 2022
Is the use of sunscreen associated with vitamin D deficiency? Find out what a recent analysis showed in the Getting vitamin D from sunlight section of our Vitamin D Supplements Review.
Also see our comparisons of sunscreens in our answer to the question: What is the best sunscreen based on safety and efficacy?
Vitamin D & Frailty
September 16, 2022
Did giving vitamin D to older women and men reduce their risk of becoming frail? See what happened in a major clinical study in the What It Does section of the Vitamin D Review. Also see our Top Picks for vitamin D.
Vitamin D for COVID-19?
July 29, 2022
A recent study suggested that supplementing with high-dose vitamin D could improve clinical outcomes for people hospitalized with COVID-19. Learn more in the COVID section of our Vitamin D Supplements Review.
Does Vitamin D Reduce Fracture Risk?
July 29, 2022
A new study indicates that high-dose vitamin D does not reduce the risk of bone fractures in older adults. Get the details in the What It Does section of the Vitamin D Supplements Review.
Vitamin D and Heart Failure
July 26, 2022
Does high-dose vitamin D improve heart function in people with chronic heart failure? Find out what a recent study showed in the Cardiovascular disease, blood pressure, and cholesterol section of our Vitamin D Supplements Review.
Vitamin D & Alzheimer's Caution
July 19, 2022
Although several studies suggest that maintaining an adequate level of vitamin D may help reduce the risk of Alzheimer's, a recent study provided a cautionary note. See the details in the Alzheimer's and Dementia section of the Vitamin D Supplements Review.
Vitamin D & Cancer
June 28, 2022
Does vitamin D decrease the risk of cancer or cancer mortality? See the latest evidence in the Cancer section of our Vitamin D Supplements Review.
Supplements Reduce Invasive Cancer Risk
May 17, 2022
Supplementing with vitamin D and omega-3 reduced the risk of invasive cancer in older men and women, according to a recent analysis. Adding resistance exercise further decreased this risk. Get the details in our Vitamin D Supplements and Fish and Marine Oil Supplements Reviews.
Magnesium for Boosting Vitamin D
April 05, 2022
Did you know that supplementing with magnesium can help boost low vitamin D levels in some people? See what a recent study showed in the ConsumerTips section of our Vitamin D Supplements Review.
Vitamin D in Fish
March 22, 2022
Which fish contain the highest levels of vitamin D, and how does cooking effect these levels? Find out what a recent study showed in the What to Consider When Buying section of our Vitamin D Supplements Review.
Also see our Review of Canned Fish for information about levels of vitamin D in canned fish.
Do Vitamin D & Whey Protein Help After a Stroke?
February 18, 2022
Can taking vitamin D and whey protein after a stroke help improve muscle strength and physical function? Find out what a recent study suggests in the Muscle, balance and falls section of our Vitamin D Supplements Review.
Also see our article about supplements and stroke risk.
Vitamin D & COVID
February 11, 2022
What vitamin D levels are associated with the lowest risk of getting severe COVID?
Does raising vitamin D levels shorten the duration of COVID symptoms? See what a recent study found.
Also see our Top Picks for vitamin D.
Vitamin D & Infant Bone Density
February 11, 2022
Does vitamin D supplementation improve bone density in breast-fed infants? Find out what a recent study suggests in the Bones and Fractures section of our Vitamin D Supplements Review.
Vitamin D & Death From COVID
February 04, 2022
Some research suggests that low blood levels of vitamin D increase the risk of death from COVID, but a new study suggests that high levels also increase risk. Get the details in the COVID section of our Vitamin D Supplements Review.
Also see our answer to the question: Do any supplements help with the coronavirus (COVID-19)?
Vitamin D & Autoimmune Disease
January 31, 2022
A major study suggests that supplementing with vitamin D may reduce the risk of some autoimmune diseases, such as rheumatoid arthritis. Fish oil may also have some benefit. But there are important caveats to the findings, and thyroid disease and psoriasis appear to be impacted. Use the above links for details.
Vitamin D for Diabetic Nerve Pain?
January 03, 2022
Can vitamin D supplementation reduce nerve pain or other symptoms of peripheral neuropathy, such as numbness and tingling, in people with type 2 diabetes? See what a new study found in the Diabetes section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
For information about other supplements that may help, see our answer to the question: Do any supplements, like Nervive, help with nerve pain, like sciatica or diabetic neuropathy?
Vitamin D Affected by Medication
December 06, 2021
A specific medication for cystic fibrosis seems to increase the absorption of vitamin D, requiring the adjustment to supplementation, according to a recent study. Get the details in the Concerns and Cautions section of our Vitamin D Supplements Review.
Sun Protection and Bone Health
November 01, 2021
Does staying out of the sun or using sunscreen increase the risk of osteoporosis or bone fracture? Find out what a recent study suggests in the Getting vitamin D from sunlight section of our Vitamin D Supplements Review.
Vitamin D and Insomnia
October 26, 2021
Does vitamin D supplementation improve sleep or reduce insomnia in people with low blood levels of vitamin D? See what a new study found in the What It Does section of our Vitamin D Supplements Review.
Vitamin D Supplements: Same Dose, Different Results?
September 24, 2021
Taking the same dose of vitamin D may lead to greater increases in vitamin D status in some people than in others, according to recent research. Find out why in the How Much Do You Need section of our Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
Vitamin D & Risk of Falls
August 09, 2021
A recent study showed that high-dose vitamin D may increase the risk of falls for certain people. Get the details in the Muscle, Balance, and Falls section of our Vitamin D Supplements Review.
Vitamin D and Palliative Cancer Care
August 06, 2021
Can high-dose vitamin D supplementation in palliative care cancer patients reduce pain and fatigue? Find out what a recent study showed in the Cancer section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for IBS?
August 02, 2021
Can vitamin D supplementation reduce the severity of symptoms in people with irritable bowel syndrome (IBS)? See what a new study found in the What It Does section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D and Pregnancy Outcomes
July 23, 2021
Can taking vitamin D during pregnancy reduce the risk of preterm labor, low birth weight or pregnancy loss? Find out what a recent study showed in the Pregnancy section of our Vitamin D Supplements Review. Also, see our Top Picks among vitamin D supplement.
Vitamin D & Triglycerides?
June 18, 2021
Can taking high-dose vitamin D increase triglyceride levels? See what a new analysis found in the Concerns and Cautions section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D May Increase the Risk of Fractures from Falls
June 14, 2021
Taking doses of vitamin D above the RDA when not necessary may increase the risk of first-time falls with fractures, according to a recent analysis. Get the details in the Muscle, Balance and Falls section of the Vitamin D Supplements Review. Also see our Top Picks for low, moderate and high-dose vitamin D supplements.
Vitamin D and Melanoma
June 11, 2021
Can vitamin D supplementation improve outcomes in people with melanoma skin cancer? See what a new study found in the What It Does section of the Vitamin D Supplements Review.
Also see our answer to the question: Do any supplements or foods help prevent sunburn or skin damage from sun exposure? Can any increase your risk of sun-related skin damage?
Also see our answer to the question: Do any supplements or foods help prevent sunburn or skin damage from sun exposure? Can any increase your risk of sun-related skin damage?
Vitamin D for Asthma?
June 11, 2021
Can vitamin D supplementation reduce immune reactions to common asthma triggers, such as dust mites? Find out what a recent analysis showed in the What It Does section of our Vitamin D Supplements Review.
Vitamin D for Orthostatic Hypotension?
May 31, 2021
Can supplementing with vitamin D reduce the risk of orthostatic hypotension (low blood pressure when standing)? Find out what a recent study showed in the What It Does section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
How Well Do Vitamin D Supplements Raise Levels?
May 21, 2021
A recent study shows the law of diminishing returns when taking high doses of vitamin D. For details, see the How Much Do You Need section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D Supplements.
High-Dose Vitamin D?
May 14, 2021
Giving a single large dose of vitamin D doesn't help people already getting sufficient vitamin D, according to a recent study. And too much vitamin D can have negative effects. Get the details in the How Much Do You Need and How Much Is Too Much section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
Vitamin D for Healing Fractures?
April 23, 2021
Does vitamin D supplementation improve healing of bone fractures in postmenopausal women? See what a new study found in the Bone and Fractures section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D & Muscle
April 08, 2021
Can taking high-dose vitamin D improve strength gains from exercise? See what a new study found in the What It Does section of our Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
Vitamin D for ED?
April 05, 2021
Taking vitamin D may increase the benefits of a common medication for men, according to a recent study. Get the details in the What It Does section of our Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
Vitamin D & Healing Bones
March 29, 2021
Broke a bone? A recent case shows how important sufficient vitamin D can be to properly heal a fracture. See the Bones and Fractures section of the Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
How Much Sun to Boost Vitamin D?
March 22, 2021
Find out how much sun exposure was needed in a recent study to significantly increase vitamin D levels in older people in the Getting Vitamin D from Sunlight section of our Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
Birth Control and Vitamin D
March 22, 2021
Can taking birth control pills affect vitamin D levels? Find out what a recent study found in the Concerns and Cautions section of our Vitamin D Supplements Review.
Vitamin D for COPD and Asthma?
March 02, 2021
Does high-dose vitamin D help treat COPD or asthma? See what a new study found in the What It Does section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
Vitamin D for Fibromyalgia?
February 12, 2021
Does vitamin D supplementation help women with fibromyalgia? See what a new study found in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D and Prediabetes
January 19, 2021
Can vitamin D supplementation improve insulin resistance in people with prediabetes? See what a recent study found in the Prediabetes section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
Vitamin D for Colds and Flu?
January 14, 2021
Does monthly high-dose vitamin D help prevent colds and flu or lessen symptoms in older people? Find out what a recent study showed in the What It Does section of our Vitamin D Supplement Review. Also, see our Top Pick for vitamin D.
Vitamin D & Risk of COVID Death
January 12, 2021
A recent study in the U.S. found that people hospitalized with COVID had much lower rates of death with certain blood levels of vitamin D. Get the details in the COVID-19 section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
Vitamin D and COVID-19
January 09, 2021
Many preliminary studies have linked adequate vitamin D levels with reduced risk of COVID-19 or less severe disease. However, a recent study did not find a benefit among people who had been supplementing with amounts generally above the recommended daily intake requirement for vitamin D. See the details in the COVID-19 section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
How Important Is Prenatal Vitamin D?
December 12, 2020
Does high-dose vitamin D during pregnancy improve motor skills and cognition in offspring? Learn what a recent study showed in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Cholesterol-lowering Statins May Affect Vitamin D Levels
December 08, 2020
Statin medications may increase or decrease blood levels of vitamin D depending on the version. Get the details in the Statins and Vitamin D section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Too Much Vitamin D
December 08, 2020
A 2-year study suggests risks with vitamin D at daily doses of 1,000 IU and higher. Get the details in the Muscle, balance and falls section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D and Hearing Loss
December 01, 2020
A recent analysis showed low levels of vitamin D to be associated with hearing loss. Learn more in the What It Does section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for COVID-19
November 25, 2020
Can high doses of vitamin D help COVID-19 patients recover? Find out what two new studies showed in the COVID-19 section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
Vitamin D and Arthritis
November 25, 2020
Studies are showing an association between vitamin D levels and rheumatoid arthritis. Learn more in the What It Does section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
Vitamin D & Cancer Prevention
November 21, 2020
Taking vitamin D may modestly reduce the risk of advanced cancer in some people, according to a recent study. Learn the details in the What It Does section of our Vitamin D Supplements Review. Also, see our Top Picks for vitamin D.
Vitamin D for Cognitive Impairment?
November 13, 2020
Can taking vitamin D improvement memory and thinking in people with mild cognitive impairment? Find out what a recent study showed in the What It Does section of our Vitamin D Review. Also, see our Top Picks for vitamin D.
Vitamin D For Eczema?
November 06, 2020
Can taking vitamin D help improve eczema? Find out what a recent study showed in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D and COVID-19
October 26, 2020
Can taking vitamin D after getting sick with COVID-19 reduce the risk of death? Find out in the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
High-Dose Vitamin D for COVID?
October 23, 2020
Elderly nursing home residents given high-dose vitamin D had much better survival rates from COVID-19 than other residents, according to a new study. However, the dose given has potential risks. Get the details in the COVID-19 section of the Vitamin D Supplements Review.
Vitamin D & Pregnancy
October 23, 2020
Maintaining sufficient blood levels of vitamin D during pregnancy is associated with better health for both mother and baby, including a decreased risk of gestational diabetes, according to a new study. Get the details in the Pregnancy section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Low Vitamin D & COVID-19 Risk
October 12, 2020
Vitamin D & Depression
October 08, 2020
Do low levels of vitamin D increase the risk of depression? Find out what a recent study showed in the What It Does section of Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D and PCOS
September 28, 2020
Can vitamin D improve symptoms of (polycystic ovary syndrome (PCOS)? Find out what a recent study showed in the What It Does section of Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Dizziness When Rising?
September 24, 2020
Can vitamin D reduce symptoms of orthostatic intolerance (low blood pressure when standing up)? Find out what a new study in adolescents showed in the What It Does section of Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Failing Hearts?
September 17, 2020
Does high-dose vitamin D help or hurt people with chronic heart failure? Find out what a new study showed in the Cardiovascular Disease section of Vitamin D Supplements Review, which also discusses cholesterol, blood pressure and heart attack risk. Also see our Top Picks for vitamin D.
Too Much Vitamin D Bad for Bone?
September 14, 2020
High doses of vitamin D may lead to loss of bone mineral density in women, according to a recent study. Get the details in the How Much Is Too Much section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Low Vitamin D and Low Blood Pressure?
September 12, 2020
Vitamin D deficiency has been linked with a form of low blood pressure (orthostatic hypotension) in older men. Get the details in the What It Does section of Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D and Risk of Death
September 07, 2020
Middle-aged men with very low blood levels of vitamin D were found to be much more likely to die over the next dozen years than men with the highest levels, according to a recent study. Learn more in the What It Does section of Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Autism Spectrum Disorder?
September 07, 2020
Can vitamin D improve symptoms of autism spectrum disorder? Find out what a recent study showed in the What It Does section of Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Seasonal Use of Vitamin D
September 03, 2020
The airway's ability to fight infections is reduced during the winter/spring and vitamin D might help, according to a recent study. For details, see the What It Does section of vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Asthma?
August 28, 2020
Does giving high-dose vitamin D to children with asthma reduce their need for inhaled steroids or allow them to go longer between attacks? Find out what a recent study showed in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D Deficiency & COVID Death Risk
August 17, 2020
Vitamin D and Vertigo
August 07, 2020
A common form of vertigo has been linked to vitamin D deficiency, but can taking a vitamin D supplement help prevent episodes of vertigo? Find out what a recent study showed in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D and Depression
August 03, 2020
Can taking 2,000 IU of vitamin D daily lower the chance of developing depression? Find out what a major study showed in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
Magnesium Helps Vitamin D
August 01, 2020
Magnesium can boost blood levels of an important form of vitamin D, according to a recent study. For details on how much magnesium to take and when, see the Magnesium affects vitamin D levels section of the Vitamin D Supplements Review. To find a good magnesium supplement, see our Top Picks for magnesium.
How Much Vitamin D from Sunshine?
July 27, 2020
Does exposure to midday sun increase already sufficient vitamin D blood levels? Get the surprising answer from a new study in the Getting vitamin D from sunlight section of the Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
Vitamin D and Risk of Death
July 17, 2020
Increasing vitamin D blood levels was associated with a lower risk of death over time in a recently published long-term study, but only up to a certain level. Find out at what vitamin D blood level the benefit ended in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D and be aware of how much is too much vitamin D.
Vitamin D and COVID Severity
July 07, 2020
Vitamin D & Osteoarthritis
July 07, 2020
Vitamin D may, in certain situations, reduce knee pain and improve function in people with knee osteoarthritis (due to worn cartilage). Vitamin D may also reduce foot pain associated with knee osteoarthritis, according to a recently published study. For details, see the Osteoarthritis section of the Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
Vitamin D & Coronavirus
July 03, 2020
Studies are linking low blood levels of vitamin D to higher risk of testing positive for the coronavirus and/or developing more severe disease. Find out what blood levels appear to be protective, as well as the results of the most recent study, in the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Signs of Too Much Vitamin D
June 26, 2020
Doctors were surprised to discover that symptoms exhibited by a 64-year old woman were due to very high levels of vitamin D from supplements. Learn about the symptoms of too much vitamin D in the Concerns and Cautions section of the Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements and learn How Much Is Too Much vitamin D.
Does Vitamin D Harden Arteries?
June 23, 2020
Vitamin D regulates calcium levels in the body but does taking high-dose vitamin D lead to arterial calcifications (hardening of the arteries)? Find out what a 3-year study showed in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks among vitamin D supplements.
Vitamin D and COVID-19 Risk
June 12, 2020
Vitamin D deficiency was associated with an increased risk of testing positive for coronavirus according to a recent study. For details see the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for COVID-19 Patients
June 01, 2020
A study evaluated the effects of giving vitamin D, magnesium, and vitamin B12 to COVID-19 patients. See the results in the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Does Too Much Vitamin D Hurt Muscle?
May 04, 2020
A study among women given moderately high doses of vitamin D found that they lost strength. Further analysis of the data suggests why. Get the details in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
How Much Sun for Vitamin D?
February 28, 2020
Is sun exposure to the hands, arms, and legs enough to boost or maintain adequate vitamin D levels? See what a recent study showed in the Getting Vitamin D from Sunlight section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Mom Affects Baby's Bones
February 24, 2020
Taking high-dose versus very-low-dose vitamin D during pregnancy led to greater bone density in offspring, according to a recent study. But, there are important caveats. Get the details in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Hives
February 07, 2020
If you suffer from chronic hives (or chronic urticaria) and are deficient in vitamin D, taking vitamin D may be helpful, according to a new study. (Vitamin D may also be helpful for other skin conditions such as eczema and psoriasis.) Get the details in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D & Bone Density
January 13, 2020
Does taking vitamin D improve bone mineral density in older men and women who are not deficient in vitamin D? See what a major study found in the Bones and fractures section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
What Happens With Too Much Vitamin D
December 16, 2019
A 50-year-old woman learned the hard way about the risks of taking far too much vitamin D. If you take a very high dose of vitamin D, be aware of the symptoms of vitamin D toxicity, as explained in the Concerns and Cautions section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
High-Dose Vitamin D for the Critically Ill?
December 13, 2019
Critically ill patients with vitamin D deficiency were given an extremely high dose of vitamin D to see if it would reduce deaths. Find out if it helped in the How Much Do You Need and How Much is Too Much? section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
Vitamin D & Muscle
December 06, 2019
If you are looking to increase muscle mass, make sure you're getting adequate vitamin D. Raising deficient levels has been shown to increase muscle in seniors, and more recently, in men and women in their 40s. For details see the Muscle, balance and falls section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D & Blood Sugar Control
October 14, 2019
Maintaining moderate levels of vitamin D may aid blood sugar control, but, according to a recently published study, high-dose vitamin D supplementation may not help. For details, see the Diabetes, insulin resistance and glucose control section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D and Risk of Cancer Death
September 30, 2019
Vitamin D Sprays
September 23, 2019
Are oral vitamin D sprays better than vitamin D capsules? Find out what studies are showing in the Oral Sprays section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Effect of High-Dose Vitamin D on Bones
August 26, 2019
A 3-year study among people with osteoporosis compared the effects of moderate vs. high doses of vitamin D on bone density and bone strength. The results may surprise you. Get the details in the How Much Do You Need and How Much is Too Much? section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
Vitamin D for Breast Cancer?
August 12, 2019
Some evidence suggests that having higher blood levels of vitamin D lowers the risk of breast cancer. Can very high-dose vitamin D slow tumor growth in women with breast cancer? See what a new study found in the Cancer section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
Vitamin D During Pregnancy
August 08, 2019
Does giving expectant mothers a high dose of vitamin D reduce the risk of tooth defects in their children? Find out in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D & Diabetes
August 02, 2019
Vitamin D supplementation can improve insulin sensitivity in some people at risk for type 2 diabetes according to a recent clinical study. For details about this, as well as related research, see the Diabetes, insulin resistance and glucose control section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Depression?
July 26, 2019
Low blood levels of vitamin D are associated with a higher risk of depression. But does taking vitamin D reduce this risk or improve mood in depressed people? Find out what recent studies have shown in the What It Does: Depression section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D among products.
Vitamin D for Allergies?
July 26, 2019
If you already take an antihistamine for allergies, will adding vitamin D provide further benefit? Find out what a recent study showed in the What It Does: Allergies section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D among products.
Vitamin D for Depression?
July 08, 2019
Can supplementing with vitamin D help people who suffer from depression? Recent studies suggest it may benefit some. See the details in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Diabetes Prevention
June 08, 2019
Does high-dose vitamin D help prevent people with pre-diabetes from progressing to type 2 diabetes? See the results of a major new study in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Psoriasis?
June 01, 2019
A recent study evaluated the effects of giving high-dose vitamin D to people with plaque psoriasis. See the results in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D-Autism Study Retracted
May 19, 2019
A study that showed a benefit in giving high-dose vitamin D to children with autism spectrum disorder has been retracted due to a lack of confidence in the findings by the editors of the journal in which it appeared. For details, see the What It Does section of the Vitamin D Supplements Review.
Vitamin D and Sunscreen
May 14, 2019
Is it possible to protect your skin from sunburn but still produce vitamin D? See what a recent study found in the Getting vitamin D from sunlight section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Gummies vs. Tablets for Vitamin D
May 10, 2019
Are gummy supplements better than tablets for getting vitamin D? See the results in the What to Consider When Buying section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D for Vertigo?
May 06, 2019
Vitamin D may be beneficial in preventing recurrence of a common form of vertigo known as benign paroxysmal positional vertigo (or BPPV) according to a preliminary study. For details, see the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Vitamin D & Incontinence
April 26, 2019
Does giving high-dose vitamin D help women who have urinary incontinence? See what a recent study found in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Does Vitamin D Improve Cancer Survival?
April 12, 2019
Does giving high-dose vitamin D to people with cancer of the colon or other parts of the digestive tract improve survival rates? Find out what recent studies are showing in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
Vitamin D & Kidney Failure
April 08, 2019
Although rare, excess intake of vitamin D can lead to kidney failure. This recently happened to a man taking a higher dose of vitamin D than he thought. Learn more in the Concerns and Cautions section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
Vitamin D for Depression?
April 05, 2019
Can supplementation with vitamin D help people diagnosed with depression? Learn what the latest studies are showing in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
Vitamin D for Overactive Bladder?
March 15, 2019
Vitamin D supplementation may help vitamin D-deficient people who suffer from urinary urgency or frequency. Get the details in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
Right Amount of D for Cognition
February 18, 2019
Three different doses of vitamin D were given to older women in a one-year study of cognition. Find out which dose resulted in the best performance on cognitive tests in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Does Vitamin D Reduce Risk of Falls?
February 01, 2019
Vitamin D can reduce the risk of falls when given to people deficient in vitamin D. But what happens when you give high-dose vitamin D to people who are not deficient? Find out in the What It Does section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D supplements.
Vitamin D for Muscle
December 24, 2018
Vitamin D increased muscle mass in older men and women with low levels of vitamin D in a recent study. Get the details in the Muscle, balance and falls section of the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D.)
Magnesium for Optimal Vitamin D Level
December 14, 2018
Magnesium intake significantly affects levels of active vitamin D in the blood, according to a new study. This helps keep vitamin D in an optimal range and is another reason to get sufficient magnesium — which many people don't. For details, see the new information in the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D and magnesium supplements).
How Important Is Vitamin D for Bones?
December 10, 2018
Many women take vitamin D supplements to maintain bone mineral density, but does it really help? A new study provides an answer. See What It Does in the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D).
Vitamin D for Restless Legs?
November 30, 2018
Does high-dose vitamin D help women and men with restless legs syndrome? Find out what a recent study reported in the What It Does section of the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D.)
Can Vitamin D Boost Cognition?
November 26, 2018
Middle-aged people with low levels of vitamin D were given high-dose vitamin D for four months. Find out if this boosted their cognitive performance in the Alzheimer's disease, dementia, memory and cognitive decline section of the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D.)
Vitamin D May Prevent Cancer Deaths
November 13, 2018
A major 5-year study in which a cross-section of Americans were given high-dose vitamin D daily found no overall reductions in cardiovascular disease or cancer or death from these causes. However, when excluding the first two years of the study, the rate of death from cancer was 25% lower with vitamin D than with placebo — a finding consistent with other studies. See the details in the Cancer section of the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D.)
No Bone Benefit with Vitamin D -- Really?
October 08, 2018
You may have read that a recent analysis of 81 controlled studies concluded that "vitamin D supplementation does not prevent fractures or falls, or have meaningful benefits on bone mineral density." In general, this is true, but there are important caveats. Learn more in the What It Does section of the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D.)
Vitamin D and Cognition
October 04, 2018
Does taking vitamin D help older individuals with mild cognitive impairment? Learn what a new study found in the What It Does section of the Vitamin D Supplements Review. (Also see our Top Picks among vitamin D supplements.)
Vitamin D for Eczema?
September 24, 2018
Can vitamin D help with eczema? See what a new study found in the What It Does section of the Vitamin D Supplements Review. (Also see our Top Picks among Vitamin D supplements).
Vitamin D for Back Pain?
September 17, 2018
High-Dose Vitamin D Risk
September 10, 2018
A new study suggests that very high-dose vitamin D may increase the risk of kidney stones. For details, see the What It Does section of the Vitamin D Supplements Review. (Also see our Top Picks among vitamin D supplements.)
Vitamin D for Mood?
September 03, 2018
Can supplementing with vitamin D improve mood during the winter? Find out what a recent study showed in the Depression & Mood section of the Vitamin D Supplements Review. (Also see our Top Picks among vitamin D supplements.)
Vitamin D and Blood Sugar Control
August 06, 2018
A recent study adds to the growing evidence that obtaining and maintaining adequate vitamin D levels can help with blood sugar control. For details about this and studies regarding vitamin D and diabetes, see the Diabetes, insulin resistance and glucose control section of the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D supplements.)
Vitamin D and Leg Muscle Strength
July 23, 2018
Giving a moderate amount of vitamin D to women deficient in vitamin D was shown to improve leg muscle strength. A much higher dose did not. Get the details, including dosage, and learn about vitamin D for strength and balance in the Muscle, Balance, and Falls section of the Vitamin D Supplements Review. (Also see our Top Picks among vitamin D supplements.)
Cancer & High-Dose Vitamin D
July 20, 2018
Lower Cancer Risk With High Vitamin D?
July 16, 2018
A recent analysis suggests that breast cancer risk is lowest with vitamin D blood levels at or above 60 ng/mL -- an unusually high level. Before you try this at home, be sure to read our commentary in the What It Does section of the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D.)
Vitamin D & Headache
July 06, 2018
Vitamin D for Strength?
June 22, 2018
Muscles contain vitamin D receptors, but does giving high-dose vitamin D to women deficient in vitamin D improve their muscle strength? Get the answer in the recent update to the Muscle, balance and falls section of the Vitamin D Supplements Review.
Vitamin D & Colorectal Cancer Risk
June 14, 2018
What level of vitamin D is associated with the lowest risk of colorectal cancer according to a recent study? Find out in the What It Does section of the Vitamin D Supplements Review. (Also see our Top Picks among vitamin D supplements.)
Type 2 Diabetes and Vitamin D
March 31, 2018
Maintaining an adequate level of vitamin D is associated with a lower risk of type 2 diabetes. But does giving vitamin D to people with existing type 2 diabetes help them with glucose control? Find out what research is showing in the What It Does section of the Vitamin D Supplements Review. (Also see our Top Picks among vitamin D supplements.)
High-Dose Vitamin D & Cholesterol
March 16, 2018
Giving high-dose vitamin D to people who are not deficient in it may backfire and increase cholesterol levels, as seen in a recent study. Get the details in the Concerns and Cautions section of the Vitamin D Supplements Review. (Also see our Top Picks among products).
Link Between Vitamin D and Multiple Sclerosis?
January 15, 2018
Although some studies suggest vitamin D deficiency is a risk factor for developing multiple sclerosis, a recent review found vitamin D intake was not associated with a reduced risk. Learn more in the "What It Does" section of the Vitamin D Supplements Review >>
Vitamin D's Cardiovascular Effect
January 05, 2018
Taking vitamin D can improve aspects of cardiovascular function in certain situations, as shown in a recently published study. Get the details in the "Cardiovascular disease, blood pressure, and cholesterol" section of the Vitamin D Supplements Review. (Also see our Top Picks among vitamin D supplements.)
Autism Risk With Low Vitamin D
December 01, 2017
Babies born with very low blood levels of vitamin D are more likely to be autistic, according to a new study. This is consistent with a study published last year showing a higher rate of autistic children in mothers with very low vitamin D blood levels during pregnancy. Get the details in the "What It Does" section of the Vitamin D Supplements Review >> (Also see our Top Picks among vitamin D supplements.)
Vitamin D and Cardiovascular Disease
November 20, 2017
Can high doses of vitamin D improve cardiovascular function? A large, one-year study in England recently sought to answer this question. Learn what the researchers discovered in the "What It Does" section of the Vitamin D Supplements Review (which includes our Top Picks for vitamin D supplements).
Vitamin D for Asthma
October 23, 2017
Taking vitamin D can reduce the number of asthma exacerbations that require corticosteroid treatment, according to a recent study. Get the details in the "What It Does" section of the Vitamin D Supplements Review >> [Also see our Top Picks among vitamin D supplements in the Review.]
Vitamin D Toxicity
October 23, 2017
Getting too much vitamin D is associated with negative effects. With continued use of enormous doses of vitamin D, toxic effects can occur, as has been reported with the use of a protein supplement containing vitamin D. See the details in the "Concerns and Cautions" section of the Vitamin D Supplements Review >>
Fatty Liver and Vitamin D
October 13, 2017
A recent study showed that it is difficult to raise vitamin D levels in some people who have non-alcoholic fatty liver disease -- a condition affecting 30% of Americans. This is concerning, as there may be benefits to raising low levels of vitamin D in such people. Learn more in the "What It Does" section of the Vitamin D Supplements Review >>
Vitamin D2 or D3?
July 08, 2017
Although both the D2 and D3 forms of vitamin D can raise blood levels of vitamin D, a new study showed one to be significantly better than the other — and there are some interesting explanations for this. Learn more in the "What to Consider When Using" section of the Vitamin D Supplements Review, which includes our Top Picks.
Vitamin D & Alzheimer's Disease
June 09, 2017
Older people with insufficient levels of vitamin D had nearly triple the risk of developing Alzheimer's disease that those with sufficient levels, according to a recent study. Those with the lowest levels also experienced a faster rate of cognitive decline. Get the details and information about optimal vitamin D levels in the "What It Does" section of the Vitamin D Supplements Review, which includes our Top Picks among supplements.
Early Menopause & Vitamin D
May 10, 2017
Women who get more vitamin D from their diets have a lower risk of early menopause, according to a recent study. However, supplements don't seem to help. Get the details in the "What It Does" section of the Vitamin D Supplements Review >>
Vitamin D for Muscle and Balance?
April 27, 2017
Why did a recent study show that both high and low-dose vitamin D didn't improve muscle strength or balance in women despite the fact that other studies have shown vitamin D to help? The likely answer has to do with the vitamin D status (i.e., blood levels) of the people chosen to participate in these studies. To find out what you should do to improve your balance and reduce your chance of falling, see the "Muscle, Balance and Falls" section of the Vitamin D Supplements Review >>
Don't Bother with High-Dose Vitamin D
April 04, 2017
Taking a moderate dose of vitamin D (particularly if you are deficient) can be very helpful, but a growing number of studies show a lack of benefit (and some adverse effects) with high-dose vitamin D. The latest study, released this morning, focused on cardiovascular disease. For details, see the "Cardiovascular disease" section of the Vitamin D Supplements Review >>
Vitamin D and Cancer
March 31, 2017
Although studies have shown that sufficient vitamin D in the blood is associated with lower risk of developing and dying from cancer, a new study among women found no cancer benefit from taking vitamin D supplements. However, the study had a major weakness. For details, see the "What It Does -- Cancer" section of the Vitamin D Supplements Review >>
Right Dose of Vitamin D to Reduce Falls
March 24, 2017
As we've reported in the past, vitamin D can reduce falls in older people, but too much can increase falls. A new study helps nail down the ideal dose and blood level to reduce falls. For details, see the "What It Does" section of the Vitamin D Supplements Review >>
Can High-Dose Vitamin D Backfire?
March 10, 2017
A recent study found that taking very high doses of vitamin D increases the production of an enzyme which inactivates vitamin D in the body -- which may help to explain why taking very high-dose vitamin D has been linked with adverse effects such as muscle weakness and increased risk of fractures and falls in previous studies. For details, see the "How Much Do You Need?" section of the Vitamin D Supplements Review (which includes our tests of products) >>
Better Executive Functioning with Vitamin D
March 05, 2017
Getting adequate vitamin D appears to help with executive functioning and attention in adolescents, according to a new study — similar to what has been preliminarily shown in men. For details, see the "What It Does" section of the Vitamin D Supplements Review (which includes our tests of products) >>
Statin Drugs and Vitamin D
March 03, 2017
If you take a statin drug to lower cholesterol, take note that recent studies show it is particularly important that you keep up your level of vitamin D. Also be aware that vitamin D supplements may not raise your vitamin D level quite as much as if you were not taking a statin. For details, see the "Statin Drugs and Vitamin D" section of the Vitamin D Supplements Review (which includes our tests of products) >>
Vitamin D Reduces Risk of Colds & Flu
February 15, 2017
A study released today shows that taking vitamin D in a certain way reduces the risk of cold and flu infections by up to 70%. The benefits are greatest for people very deficient in vitamin D. For details, see the "What It Does" section of the Vitamin D Supplements Review (which includes our tests of products) >>
Headache and Vitamin D
January 06, 2017
A large study of middle-aged men found that those with low levels of vitamin D in their blood were twice as likely to have frequent headaches as men with higher levels. For details, see the "What It Does" section of the Vitamin D Supplements Review >>
Vitamin D and Autism Risk
December 16, 2016
Children whose mothers are vitamin D deficient during pregnancy are much more likely to have autistic traits by age six than those whose mothers have sufficient levels during pregnancy, according to a new study. Get the details, as well as our reviews of vitamin D supplements, in the "What It Does" section of the Vitamin D Supplements Review »
Vitamin D for Autism
December 12, 2016
A recent study among young children with autism found that high-dose vitamin D reduced autism symptoms from moderate to mild. This is a preliminary study and more research is required. For details about this study and other uses of vitamin D, as well as our tests and comparisons of products, see the "What It Does" section Vitamin D Supplements Review »
Vitamin D Keeping You Up?
December 07, 2016
A study of women given daily doses of vitamin D found that those who achieved the highest blood levels of vitamin D experienced a deterioration in the quality of their sleep. This is consistent with an earlier study showing decreased production of melatonin with high-dose vitamin D. For details, see the "Concerns and Cautions" section of the Vitamin D Supplements Review >>
Understanding How Much Vitamin D You Need
November 15, 2016
Misunderstanding the daily requirement for vitamin D is common and can have adverse implications. To address this issue, leading experts recently published an article re-explaining the requirements. We've summarized this in the "How Much Do You Need and How Much Is Too Much?" section in the Vitamin D Supplements Review >>
Vitamin D & Breast Cancer Survival
November 11, 2016
A new study making headlines this week found that women with "the highest" levels of vitamin D had better survival rates from breast cancer than women with the "lowest rates." What was left out of news stories — and may surprise you — is what these levels are. Find out in the "What It Does" section of the Vitamin D Supplements Review >>
Vitamin D Spray
October 30, 2016
A study found that vitamin D oral spray was no better than capsules in raising vitamin D levels in healthy men and women. However, a similar study in people with intestinal conditions that can affect absorption suggests a spray may be better. For details (as well as our ratings of products), see the ConsumerTips section of the Vitamin D Supplements Review >>
Vitamin D Sweet Spot
October 19, 2016
Having the right blood levels of vitamin D has many proven benefits, but too little and too much vitamin D can be problematic. A new study shows this also to be true in people with diabetes with regard to a type of nerve damage that can affect blood pressure and heart rate. For details see the "What It Does" section of the Vitamin D Supplements Review >>
Raising Vitamin D Levels May Reduce Risk Factor For Breast Cancer
September 13, 2016
A study among postmenopausal women showed that raising vitamin D blood levels helps reduces blood estrogens, which are a known risk factor for breast cancer. And there's something that reduces estrogen levels even more! For more details, see the "What It Does - Cancer" section of the Vitamin D Supplements Review >>
Vitamin D & Asthma
September 06, 2016
A daily, moderate dose of vitamin D reduces hospitalizations and use of steroid medication in people with mild to moderate asthma, according to a new study. Get the details in the "What It Does" section of the Vitamin D Supplements Review >>
Vitamin D, Blood Sugar & Insulin Resistance
August 19, 2016
Vitamin D, Blood Sugar & Insulin Resistance --A moderate, daily dose of vitamin D had positive effects on blood glucose and insulin sensitivity in healthy men and women who largely were deficient in vitamin D, according to a new study. Get the details in the Vitamin D Supplements Review >>
Vitamin D for Asthma
August 01, 2016
Short term supplementation with vitamin D improved symptoms of asthma in children, according to a new study. Get the details in the "What It Does" section in our Vitamin D Supplements Review >>
Vitamin D & Fatty Liver
July 11, 2016
Vitamin D supplementation may decrease fat accumulation in the liver in people with non-alcoholic fatty liver disease who are vitamin D deficient. Get the details in the "What It Does" section of the Vitamin D Supplements Review >>
Osteoarthritis and Vitamin D
June 03, 2016
A large, long-term study among older people with knee osteoarthritis found no benefit from taking vitamin D. More details about this -- and about vitamin D for many other conditions -- are found in the "What It Does" section in our Vitamin D Supplements Review >>
Vitamin D and Cancer
April 19, 2016
Several studies, including one published this month, show that sufficient levels of vitamin D in the body are associated with decreased risk of various forms of cancer. What's the best level? See "Cancer" in the What It Does section of the Vitamin D Supplements Review >>
Vitamin D and Allergy
April 16, 2016
Vitamin D is known to modulate the immune system. Having sufficient levels is associated with reduced risk of allergy and asthma. A recent study showed that giving vitamin D to pregnant women and their infants resulted in fewer infants being allergic to house dust mites and needing to see a doctor for asthma. For details, see "Allergy," as well as "Asthma," in the What It Does section of the Vitamin D Supplements Review >>
Too Much Vitamin D Weakens Legs
April 11, 2016
In recent months we have reported that giving too much vitamin D to people who don't need it increases the risk of falls. A major study now shows that it also weakens leg muscles — apparently to the surprise of the researchers. Keep in mind that giving vitamin D to people who are deficient in it can decrease the risk of falls. Get the details in the Vitamin D Supplements Review >>
Vitamin D Improves Heart Output
April 04, 2016
A recent study in people with chronic heart failure (poor heart output) found that vitamin D improved heart output. However, the study did not achieve its main objective — to increase walking distance. The dose may have been to blame. For details see the "What It Does" section of the Vitamin D Supplements Review >>
Vitamin D and MS
March 14, 2016
A study found that children born to women significantly deficient in vitamin D during pregnancy were much more likely to develop multiple sclerosis as adults. For details, see the "What It Does" section of the Vitamin D Supplements Review >>
Knee Arthritis & Vitamin D
March 07, 2016
People with knee osteoarthritis (worn joints) and generally low vitamin D levels given vitamin D for 2 years showed greater improvement in some, but not all, symptoms compared to those given a placebo. Get the details (as well as our product test results) in the Vitamin D Supplements Review >>
Vitamin D and Prostate Cancer
March 04, 2016
A recent study looked at the association between vitamin D blood levels and the risk of advanced prostate cancer. Based on the findings from this and related studies, there seems to be a reasonable approach with vitamin D to potentially lower prostate cancer risk. Get the details (as well as our tests of products) in the Vitamin D Supplements Review >>
Vitamin D Needed For Nursed Infants
February 18, 2016
A recent study found that the longer a child is nursed, the higher the risk of being deficient in vitamin D. See the details and recommendations in the Vitamin D Supplements Review >>
Football & Vitamin D
February 05, 2016
The outcome of today's Super Bowl 50 may be influenced by players' levels of vitamin D. Several studies show that having the right amount of vitamin D in the body reduces the risk of falls in the elderly, but research also shows benefits for younger adults — including fewer injuries among NFL football players. Get the details in the Vitamin D Supplements Review and enjoy the game!
Vitamin D Reduces PMS Symptoms
January 22, 2016
A recent study found that taking vitamin D significantly improved symptoms of premenstrual syndrome (PMS) in young women who were deficient in vitamin D. Get the details in the Vitamin D Supplements Review >>
Ideal Vitamin D Levels to Reduce Cardiovascular Risk?
November 20, 2015
A study of a large group of Americans found that the risk of developing cardiovascular disease was 35% higher in people with low levels of vitamin D. Get the details, plus more about maintaining healthful blood levels of vitamin D, and our tests of products, in the Vitamin D Supplements Review >>
Be aware that there is also a risk of getting too much vitamin D >>
Be aware that there is also a risk of getting too much vitamin D >>
Too Much Vitamin D Can Increase Colds
November 07, 2015
A recent study in people with asthma found that giving high-dose vitamin D increased the risk of developing a cold among those who achieved higher levels of vitamin D or were African-American. Nearly half of those in the study were not vitamin D deficient to start. In contrast, studies have found that giving moderate doses of vitamin D to people who are vitamin D deficient decreases the risk of colds. The point, in our opinion: Maintain an adequate, but not excessive, level of vitamin D. For details (including dosage, levels, and our tests of products) see the Vitamin D Supplements Review >>
Headlines Saying "Vitamin D and Calcium Don't Prevent Colon Cancer" Are Not Quite Right
October 16, 2015
A study released this week found that vitamin D and calcium supplements did not reduce the risk of developing colorectal polyps in people prone to them. A closer look at the study, however, suggests that this may not be true for everyone. Get the details in the update in the Vitamin D Supplements Review >> and the Calcium Supplements Review >>
Vitamin D Reduces Risk of Falls
October 02, 2015
A study found that giving a modest daily dose of vitamin D significantly reduced the rate of falls in women who were prone to falls and were deficient in vitamin D. Get details about this and other studies, as well as results of our product tests, in the Vitamin D Supplements Review >>
Adequate Vitamin D Reduces Frequent Respiratory Infections
September 19, 2015
A study in people with frequent respiratory infections found that taking vitamin D for one year resulted in fewer infections than taking placebo. In contrast, a similar study did not find a benefit. Why the difference? Find out in the Vitamin D Supplements Review >>
Adequate Vitamin D May Lower Risk of Alzheimer's
September 15, 2015
A study showed that men and women with adequate levels of vitamin D in their blood were less likely to experience declines in cognitive functioning associated with Alzheimer's dementia than those with lower levels. More about the study, including the vitamin D level considered adequate, as well as our reviews of supplements, is found in the Vitamin D Supplements Review >>
Vitamin D Increases Strength
September 01, 2015
A recently published review of clinical studies found that supplementing with vitamin D can improve muscle strength in young, healthy men and women. This has also been found in older individuals and may relate to the fact that vitamin D receptors occur in skeletal muscle. However, this benefit may be limited to vitamin D deficient individuals. Get the details in the "Muscle, balance and falls" section of the Vitamin D Supplements Review >>
Vitamin D Reduces Risk of Falls
August 18, 2015
A recent study found that in older adults, many of whom had insufficient levels of vitamin D and a history of falls, vitamin D supplementation reduced the number of reported falls by almost half. Get the details, including dosage, and our tests of popular products, in the Vitamin D Supplements Review »
More Evidence Against Too Much Vitamin D
August 04, 2015
A well-controlled study has shown that post-menopausal women do not benefit from taking vitamin D when they are not truly deficient. Get the details on appropriate dosage and use of vitamin D, as well as product test results, in the Vitamin D Supplements Review >>
Vitamin D and Inflammation
August 01, 2015
A new study of elderly people given vitamin D showed little effect on markers of inflammation in the body. Correcting very low levels of vitamin D may be helpful, but further raising vitamin levels does not seem necessary for proper immune function. In fact, there may be some downside. For details about this and other uses for vitamin D (and our product test results), see the Vitamin D Supplements Review >>
High-Dose Vitamin D Increases Upper Respiratory Infections
June 16, 2015
A study among older people found that taking a high dose of vitamin D every 2 months increased the risk of upper respiratory infection by 48% compared to taking low-dose vitamin D daily. Infections lasted two days longer for those taking the high dose versus the low dose. For details, including dosage, as well as our test reports on vitamin D supplements, see the Vitamin D Supplements Review >>
Adding Vitamin D to Statin Treatment
May 26, 2015
A recent study among people taking statin medication for high cholesterol showed significant improvements in cholesterol levels when daily vitamin D was added as treatment. Improvements were greatest among those who began with lower blood levels of vitamin D. More details, along with our reviews of products similar to the one used in this study, are found in the Vitamin D Supplements Review >>
Vitamin D Strengthens Muscle
May 19, 2015
In a recent study, a modest daily dose of vitamin D led to impressive gains in leg strength in women who were deficient in the vitamin. Details about this study (including dosage) and other studies of vitamin D, along with our reviews of products, are found in the Vitamin D Supplements Review >>
Too Much Vitamin D
May 01, 2015
A U.S. study showed a recent 26-fold increase in the percentage of people with excessive blood levels of vitamin D, driven by increased supplement use. Although acute toxic effects were rare, potential long-term risks exist with these high levels. See the details in Vitamin D Supplements Review >>
Vitamin D and Statin-Related Muscle Pain
April 14, 2015
Taking high doses of vitamin D may reduce statin-related muscle pain in people with low blood levels of vitamin D, according to a new study. Get more information and our test reports on vitamin D supplements in the Vitamin D Supplements Review >>
Vitamin D for Diabetic Neuropathy
March 31, 2015
Supplementing with vitamin D can reduce pain and symptoms of diabetes-related peripheral neuropathy in people with type 2 diabetes who are vitamin D deficient, a recent study reports. More about the use of vitamin D in diabetes and many other conditions, as well as our product test results, are found in the Vitamin D Supplements Review >>
Vitamin D and Reducing Injuries From Falls
March 24, 2015
Although vitamin D may be able to reduce the risk of falls in women deficient in vitamin D, a new study shows that, among women with sufficient vitamin D, it does not help and may have a negative effect. At the same time, the study showed that an exercise regime cut the rate of injuries from falls by half. Get more details in the Vitamin D Supplements Review >>
Vitamin D for Blood Pressure?
March 20, 2015
Low levels of vitamin D in the blood are associated with high blood pressure. However, a recent review of many studies concludes that giving vitamin D doesn't help lower blood pressure. For more details about this and other potential uses of vitamin D, as well as our test-based reviews of products, see the Vitamin D Supplements Review >>
Vitamin D Helps in Pregnancy
March 06, 2015
A new study showed that giving vitamin D to women with low levels of vitamin D resulted in a dramatic reduction in pre-term labor, pre-eclampsia, and gestational diabetes compared to untreated women. For details, see the Vitamin D Supplements Review >>
Vitamin D and Colorectal Cancer
January 16, 2015
Higher blood levels of vitamin D are associated with a reduced risk of colon cancer, and a new study shows this association to be strongest with a particular subtype of colon cancer. The risk of this cancer in those with higher vitamin D levels is only 10% of that in those with low levels. For details about this and the uses of vitamin D, as well as our ratings of vitamin D supplements, see the Vitamin D Supplements Review >>
Vitamin D for COPD
December 02, 2014
A study of people with chronic obstructive pulmonary disease (COPD) found that taking vitamin D significantly reduced the risk of moderate to severe exacerbation, but only among people who began the study deficient in vitamin D. Get the details and information about other uses of vitamin D, along with our quality ratings of vitamin D supplements, in the Vitamin D Supplements Review >>
Take Vitamin D with a Meal Containing Fats
November 25, 2014
We've been suggesting this for years and a new study re-emphasizes the point. Get the details in the ConsumerTips section of the Vitamin D Supplements Review >>
Risk of Bone Fracture Higher With Too Much and Too Little Vitamin D
September 26, 2014
A large study in elderly men identified a range of vitamin D blood levels associated with the lowest risk of experiencing a bone fracture. Risk nearly tripled among men with higher levels of vitamin D as well as among those with very low levels. For details, including the range of vitamin D associated with lowest risk of fracture, see the update in the Vitamin D Supplements Review >>
Vitamin D for Asthma
September 26, 2014
A pilot study in older people with asthma found that daily supplementation with vitamin D improved symptoms among those with uncontrolled asthma. These people were also most likely to have had low blood levels of vitamin D to start. Get the details, including the dose used, and more information about the role of vitamin D in asthma, in the updated Vitamin D Supplements Review >>
Lower Risk of Surgical Complications with Sufficient Vitamin D
August 19, 2014
A recent study found that higher blood levels of vitamin D were associated with lower risk of developing serious post-operative complications, including death. As in other studies, the apparent benefit of higher levels of vitamin D increased only up to a point. Get the details in the update to the Vitamin D Supplements Review >>
Up To a Point, Alzheimer's Risk Falls with Vitamin D
August 07, 2014
A new study shows that, up to a point, the risks of developing Alzheimer's disease and other forms of dementia fall with higher blood levels of vitamin D. However, the research also clarifies that exceeding a certain blood level of vitamin D provides no further benefit. In fact, additional research suggests that too much vitamin D can have negative effects. The message: Make sure you have a sufficient, but not excessive level of vitamin D. For details about these levels, as well as results of our tests of vitamin D supplements, see the updated Vitamin D Supplements Review >>
Vitamin D & Calcium for Diabetes Due to Pregnancy
July 11, 2014
A new study found supplementation with a combination of vitamin D and calcium improved fasting blood sugar levels, serum insulin levels, and insulin sensitivity in women with gestational (pregnancy-related) diabetes. For more details, including dosage, as well as our tests and comparisons of vitamin D and calcium supplements, see the update to the Vitamin D Supplements Review (Including Calcium, Vitamin K, Magnesium) >>
Vitamin D May Help Lower Blood Pressure
June 23, 2014
A recent study in people with mild to moderate high blood pressure showed that taking a vitamin D supplement helped lower blood pressure. Subjects in the study were already taking a calcium channel blocker (nifedipine), but taking vitamin D reduced blood pressure by several additional points. For details, including the dose of vitamin D used, as well as our tests of vitamin D supplements which can provide this dose, see the updated Vitamin D Supplements Review (Including Calcium, Vitamin K, and Magnesium) >>
Vitamin D and Rheumatoid Arthritis
June 12, 2014
A recent study shows that people with rheumatoid arthritis tend to have significantly lower levels of vitamin D in their blood than healthy individuals of the same age, gender and body weight. More details, including the vitamin D levels in these groups, is found in the update to the Vitamin D Supplements Review >>
Vitamin D Helpful for Asthma?
May 20, 2014
A recent study reported that giving high-dose vitamin D to asthma patients did not significantly reduce the rate of failure with conventional medications. However, a closer look at the study suggests that this conclusion is misleading and that a benefit may exist. Get the details in the update to the Vitamin D Supplements Review >>
Study Suggests Vitamin D Level for Blood Sugar Control
May 10, 2014
A certain minimum level of vitamin D in the blood is associated with normal control of blood sugar, according to a recently published study. The study focused on women who were overweight or obese but not diabetic. The vitamin D level is consistent with the range suggested by many other studies. For more details, as well as our tests of vitamin D supplements, see the updated Vitamin D Supplements Review >>
Vitamin D Deficiency May Predict Advanced Prostate Cancer
May 02, 2014
According to a new study, prostate biopsies in men who are deficient in vitamin D are more likely to show a higher grade and stage of cancer than biopsies in men with higher levels of vitamin D. For more details, as well as our tests of vitamin D supplements, see the Vitamin D Supplements Review >>
Reduced Risk of Death with Vitamin D
April 05, 2014
A recent review of clinical studies involving vitamin D concluded that supplementation with vitamin D-3 significantly reduced overall mortality among older individuals by 11%, while vitamin D-2 had no overall effect. The review did not define exactly when or how much vitamin D is most effective, but you can find sensible guidelines in the Summary section of the Vitamin D Supplements Review >>
Vitamin D for Weight?
March 28, 2014
A study of overweight women who were dieting and exercising found that taking vitamin D did not increase the amount of weight they lost. Those attaining the highest blood levels of vitamin D did lose more weight than other women, but this may not have been due to vitamin D. For details about the study, information about other uses of vitamin D, and our tests of vitamin D supplements, see the updated Vitamin D Supplements Review >>
Vitamin D and Breast Cancer Survival
March 07, 2014
A new analyses of clinical studies found that women with the highest blood levels of vitamin D had a much higher rate of survival from breast cancer than women with the lowest levels. Details on what may be the most beneficial levels, as well as our test results for vitamin D supplements, are found in the updated Vitamin D Supplements Review >>
Vitamin D Helps Fibromyalgia
January 17, 2014
Fibromyalgia is an inflammation of the muscle and soft tissue which causes pain and fatigue. A recent study found that giving vitamin D reduced the pain associated with fibromyalgia. For details about the dose and target vitamin D blood level in the study, as well as our tests of vitamin D supplements, see the updated Vitamin D Supplements Review >>
Lower Vitamin D in Blacks May Be Sufficient
November 27, 2013
The traditional method of assessing vitamin D levels may not be appropriate for most black people, according to a new study. Due to a genetic variant, this approach classifies many black individuals as "deficient" in vitamin D although their levels may be adequate. For details see the update to the Vitamin D Supplements Review >>
Vitamin D for Post-Menopausal Women
October 05, 2013
A study compared the effects of low-dose and high-dose vitamin D on bone mineral density in post-menopausal women who were also supplemented with calcium. Both dosages helped prevent loss of bone mineral density, but the higher dose was less efficient in reducing bone turnover, i.e., bone loss, contrary to what the researchers expected. For details, including dosage, see the updated Vitamin D Supplements Review>>
Vitamin D for Adolescents
October 05, 2013
A study found that vitamin D supplementation increased bone density in the hips of adolescent girls, but not of boys. Interestingly, a high dose appeared to have less effect than a low dose. For details, including dosage and our tests of vitamin D supplements, see the updated Vitamin D Supplements Review>>
When Vitamin D Doesn't Help
September 28, 2013
A recent study in postmenopausal women in New York showed that taking a vitamin D supplement did not reduce bone loss (based on measurements of markers of bone turnover). However, calcium supplementation did appear to help. Why? It all has to do with how much vitamin D and calcium the women were already getting without the supplements. You can find out the amounts and get more details in the update to the Vitamin D Supplements Review >>
Vitamin D for Hypertension?
August 17, 2013
Some studies have suggested a modest reduction in high blood pressure with vitamin D supplementation. However, a recent study did not find such a benefit - although a closer look reveals why these results may not tell the full story. Get the details, plus more information about vitamin D and cardiovascular health, and test results for 55 vitamin D supplements, in the updated Vitamin D Supplements Review >>
Vitamin D May Protect Bones From Aging
July 20, 2013
Researchers recently analyzed bone samples from people who were deficient in vitamin D and found changes indicating that the bone had "aged" and was more brittle than bone from people not deficient in vitamin D. For details about this study -- including the levels of vitamin D associated with Vitamin D May Protect Bones from Aging -- Researchers recently analyzed bone samples from people who were deficient in vitamin D and found changes indicating that the bone had "aged" and was more brittle than bone from people not deficient in vitamin D. For details about this study -- including the levels of vitamin D associated with these changes, studies of other effects of vitamin D, as well as test results and comparisons for 55 vitamin D supplements, see the updated Vitamin D Supplements Review >>
Vitamin D & Depression
June 29, 2013
Women with depression and type 2 diabetes were given high-dose vitamin D for several weeks in a small, pilot study. By the end of the study, vitamin D levels in the blood had risen considerably and mood was significantly improved, as was blood pressure. Although just a pilot study, this is not the first study to suggest that vitamin D may help with depression. For more details, as well as test results and comparisons for 55 vitamin D supplements, see the updated Vitamin D Supplements Review >>
Does Vitamin D Prevent Ear Infection?
June 08, 2013
Maintaining adequate levels of vitamin D in children appears to reduce mild ear infections, but too much vitamin D may have a downside. Find out the details in our updated Vitamin D Supplements Review >>
Optimum Level of Vitamin D
May 18, 2013
New research shows that blood levels which are too low or too high for vitamin D are associated with increased risk of heart attack and earlier death. Find the "sweet spot" for vitamin D levels as well as test results for 55 vitamin D supplements in the updated Vitamin D Supplements Review >>
Vitamin D for Infants
May 11, 2013
How much is needed and how much is too much? A new study sheds light on what's appropriate for infants. Get the facts and our tests of 55 vitamin D supplements (including baby drops) in the updated Vitamin D Supplements Review >>
Vitamin D & Pneumonia
May 04, 2013
A new study in men and women ages 53 to 73 found that a low vitamin D level in the blood was almost as strong a risk factor for pneumonia as smoking! Get the details, including the level with lowest risk of pneumonia, in the updated Vitamin D Supplements Review >>
Lower Risk of Fibroids With Vitamin D
May 04, 2013
A study of women in Washington, D.C. showed that those with higher blood levels of vitamin D had a 32% lower risk of uterine fibroids -- the most common reason for hysterectomy. Unfortunately, most of the women had less than sufficient levels of vitamin D. Find out the levels associated with lowest risk of fibroids, learn how to improve vitamin D levels (without overdoing it), and get the results of our latest product tests in the Vitamin D Supplements Review >>
Vitamin D and Knee Arthritis?
January 12, 2013
Can taking vitamin D reduce the pain and progression of osteoarthritis of the knee? A new study found no benefit for people who already had sufficient levels of vitamin D. In fact, these people needed more anti-inflammatory medication during the study than those given placebo. However, as seen in many other studies of vitamin D, people who entered the study deficient in vitamin D appeared to benefit from being given vitamin D, experiencing reduced pain. For more details, see the update in the Vitamin D Supplements Review, which includes our tests of vitamin D supplements. If you suffer from osteoarthritis of the knee or other joints, also read about glucosamine and chondroitin, as supplements with these ingredients may help. We have tested many of these products.
Vitamin D and Pregnancy
January 05, 2013
A recent study shows that low levels of vitamin D in pregnant women are associated with a higher risk of babies born small for their gestational age. For details, see the update in the Vitamin D Supplements Review, which includes our tests of vitamin D supplements and extensive information about the use of vitamin D. More >>
Vitamin D and Diabetes Risk
December 01, 2012
A new study shows a strong association between lower levels of vitamin D in the blood and a higher risk of developing type 1 diabetes (i.e., requiring insulin). The risk of diabetes was more than 3.5 times as great among people with low levels of vitamin D compared to those with higher levels -- although no additional benefit was found for people with the highest levels of vitamin D. Find out more -- including the specific level associated with the lowest risk of type 1 diabetes -- in the updated Vitamin D Supplements Review, which includes our test results for 51 vitamin D supplements. More >>
Vitamin D and Bladder Cancer
November 03, 2012
A new study looked at vitamin D levels and the risk of developing bladder cancer. Find out which levels were best, as well as which vitamin D supplements pass our tests, in the updated Vitamin D Supplements Review. More >>
Large Study Suggests Best Vitamin D Level
October 27, 2012
What's the best level of vitamin D in your body for overall health? One way to answer this question is to compare mortality rates (deaths per year) associated different levels of vitamin D. A new study did just this, reviewing information about thousands of Americans. It concluded the best levels are between 20 and 40 ng/mL, as the risk of dying is fairly similar across this range. However, a closer look at the findings suggests an even smaller range actually associated with the lowest mortality. For the details, as well as our suggestions on how to use vitamin D, and quality ratings of products, see the Vitamin D Review. More >>
Vitamin D for Lupus
October 20, 2012
A recent small study found that vitamin D supplements helped people with lupus (systemic lupus erythematosus -- SLE), a long-term autoimmune disease. See the update to the Vitamin D Supplements Review which has details on who may benefit, dosage, and results of our product tests. More >>
Does Vitamin D Prevent Colds?
October 06, 2012
A recent study found vitamin D supplementation did not reduce the number or severity of colds, but a closer look suggests that it can, depending on your vitamin D level. Get the details and our ratings of 51 vitamin D supplements in the updated Vitamin D Supplements Review >>
Vitamin D & Alzheimer's
September 15, 2012
A seven-year study of women over age 75 found those with higher intakes of vitamin D from their diets were 77% less likely to develop Alzheimer's disease. The amount of vitamin D intake associated with this large benefit was actually fairly modest. Get the details in the updated Vitamin D Supplements Review, which includes our product tests and quality ratings. More >>
Vitamin D Speeds Recovery from Tuberculosis
September 15, 2012
A study in London found that adding vitamin D to standard antibiotic treatment for tuberculosis significantly reduced inflammation and speeded recovery. The majority of these patients, however, had been extremely deficient in vitamin D. Get the details in the updated Vitamin D Supplements Review. More >>
Low Vitamin D Levels and Obesity -- A Dangerous Combination
August 18, 2012
A new study links low blood levels of vitamin D in obese individuals to a greatly increased risk of insulin resistance (a condition linked to type 2 diabetes). The results add to the growing list of reasons to make sure you maintain a sufficient level of vitamin D. Get the details in the latest update to ConsumerLab.com's Vitamin D Supplements Review. More >>
Is Vitamin D2 or D3 Better?
August 01, 2012
Over the years, studies have shown vitamin D3 to be either equal to or better than vitamin D2 for raising vitamin D blood levels. A new study further tips the scales. Get the details, as well as our tests of vitamin D supplements, in the updated Vitamin D Supplements Review. More >>
Vitamin D Prevents Hip Fracture
July 21, 2012
We recently reported that a U.S. Task Force found it unclear if vitamin D prevented hip fracture, but a more recent report found otherwise. The new report suggests a specific minimum blood level of vitamin D to help prevent fractures, the dosage found most effective, and the frequency at which vitamin D should be taken. Get the details in the recent update to the Vitamin D Supplements Review, which includes our tests of vitamin D supplements. More >>
Vitamin D Tests Unreliable
June 30, 2012
A preliminary report suggests that many vitamin D blood tests are incorrect, often yielding low results. This can lead to the diagnosis of vitamin D deficiency when it does not exist. Certain people may be more prone to a false low reading due to their source of vitamin D. Learn more in the update to the Vitamin D Supplements Review entitled Vitamin D Tests -- Not Always Reliable >>
Does Vitamin D Help Manage Weight?
June 30, 2012
If you've been reading our recent newsletters, many reports are being published about the effects of vitamin D. Here's one more: People with higher levels of vitamin D tend to put on less weight than people with lower levels. See the details in the update to the Vitamin D Supplements Review. More >>
Don't Take Vitamin D?
June 16, 2012
Recommendations were published this week by an expert panel against the use of certain combinations of vitamin D and calcium in postmenopausal women to prevent fractures -- as the risks outweighed the benefits. However, this does not mean you shouldn't take vitamin D. In fact the experts recommended that people at increased risk for falls should take vitamin D.
Find out exactly what was recommended! Read the update to the Vitamin D Review. You'll get a more complete picture of what vitamin D supplements can and can't do, the latest information on what levels of vitamin D in your body seem optimal for overall health, and our test findings for vitamin D supplements. More >>
Find out exactly what was recommended! Read the update to the Vitamin D Review. You'll get a more complete picture of what vitamin D supplements can and can't do, the latest information on what levels of vitamin D in your body seem optimal for overall health, and our test findings for vitamin D supplements. More >>
Too much vitamin D may increase the risk of dying
June 02, 2012
A recent study of nearly a quarter million people found those with vitamin D levels above that considered sufficient, but not much higher, had the lowest risk of dying over the study period. People with high levels of vitamin D were more likely to have died. Some earlier research suggests the same. What does this mean for you? See our update to the Vitamin D Supplements Review for more information. More >>
Vitamin D and the Risk of Death
March 31, 2012
In a six-year study of over 10,000 people in Kansas, the risk of death was found to be 164% higher among those with lower levels of vitamin D in their blood. These people were also more likely to suffer from hypertension, coronary artery disease, cardiomyopathy, and diabetes than those with higher levels. Only 29% of the people in the study had the higher level of vitamin D. For details, including the level of vitamin D associated with lower risk of death, ways to boost vitamin D, tests of vitamin D supplements, and more, see the Vitamin D Review >>
Vitamin D Effect on Body Fat and Cholesterol
March 10, 2012
As we have reported earlier, adequate intake of vitamin D may decrease the risk of cardiovascular disease. A new study may help explain why. A 12-week course of vitamin D given to overweight women lead to a boost in HDL ("good" cholesterol) as well as a decrease in body fat. However, total body weight did not change and there was an increase in LDL ("bad") cholesterol, although it appeared to be less plaque-forming in nature. For details, including the dose given, see the updated information in the Vitamin D Supplement Review. More >>
Strength Improves with Vitamin D
March 10, 2012
A review of 13 studies found that vitamin D supplements may improve balance and muscle strength, but not gait, among older individuals. See the update to the Vitamin D Supplements Review for details, including dosage. More >>
Vitamin D to Prevent Menstrual Pain
March 10, 2012
A new study found that taking a very high dose of Vitamin D reduced pain by 41% for two months among women who suffer from painful menstrual cramps. However, there are potential concerns with such a high dose of vitamin D. For more information, including the dose used and potential concerns, see the update to the Vitamin D Supplements Review. More >>
Vitamin D and Inflammation
January 21, 2012
A new study found that raising low levels of vitamin D appears to reduce inflammation in the body (based on measurements of C-reactive protein, or CRP, a marker of inflammation). However, once vitamin D levels reached what some people consider to be barely sufficient, CRP slowly but progressively increased, suggesting an inflammatory action of vitamin D at higher levels. The study raises the question of what is the ideal level of vitamin D in the body.
Be sure you have the latest information! See the update to the Vitamin D Supplements Review, which includes details on this and other vitamin D studies, as well as our latest product tests.
Be sure you have the latest information! See the update to the Vitamin D Supplements Review, which includes details on this and other vitamin D studies, as well as our latest product tests.
Vitamin D and Pancreatic Cancer
January 07, 2012
A lower risk of developing pancreatic cancer was recently associated with higher levels of vitamin D in the body. See the update to the Vitamin D Supplements Review for the vitamin D levels associated with decreased pancreatic cancer risk, as well as our ratings of vitamin D supplements.
More Vitamin D for Obese Adolescents
November 28, 2011
Vitamin D is fat soluble, so obese people who are deficient in it need more than other people to increase their vitamin D levels. A recent study in obese adolescents showed just how much more they need. It also determined that a relatively high dose of vitamin D was safe in these adolescents. For details, including the dosage used, see the update to the Vitamin D Supplements Review, which includes ConsumerLab.com's quality ratings and comparisons of vitamin D supplements.
How to Boost Your Vitamin D!
September 20, 2011
A study of people whose vitamin D levels did not rise enough despite taking a supplement found that just changing when the supplement was taken boosted vitamin D levels by 50%. To find out how and to get more details, see the recent update to the Vitamin D Review. More >>
Vitamin D - Depression Link
September 10, 2011
A study of postmenopausal women found the risk of depression to be 21% lower among those consuming higher amounts of vitamin D. For details, including the vitamin D source and amounts associated with decreased risk, see the update to the Vitamin D Review. More >>
Vitamin D and Diabetes Risk
August 01, 2011
A recent report showed that the risk of developing type 2 diabetes increases when vitamin D intake is low. The increased risk of diabetes is even more dramatic when vitamin D in the blood is below adequate levels. Get the details in the update to the Vitamin D Supplements Review >>.
Kidney Stones Linked to Calcium and Vitamin D Supplementation
July 19, 2011
A recent report showed that women taking a calcium and vitamin D supplement over a period of several years were 17% more likely to develop kidney stones than women who did not take the supplement. ConsumerLab.com reviewed this study. While the findings are correct, there seems to be no reason to give up vitamin D supplements and a small concern with calcium supplementation. Get the details in the update to the Calcium Supplements Review >>. The new information is also found in an update in the Vitamin D Supplements Review >>.
Does Taking Vitamin D Reduce the Risk of Heart Disease?
June 21, 2011
Earlier research has suggested an association between higher vitamin D levels in the blood and reduced risk of heart attack. But blood levels are affected by both sun exposure as well as intake of vitamin D. A new study shows that men with higher vitamin D intakes from foods and supplements have a 14% reduction in their risk of cardiovascular disease and stroke. However, the study found no reduction among women. The amount of vitamin D intake shown to be beneficial and possible reasons why a benefit was not found in women are provided in the updated "What It Does" section of our Product Review of Vitamin D Supplements. More >>
Vitamin D and Allergy?
February 26, 2011
Recent analyses of data from thousands of individuals across the U.S. show an association between serum vitamin D levels and certain allergies. The association was found in children and adolescents for 11 different allergens, but no association was found in older individuals. See the Vitamin D Product Review for the types of allergies and level of vitamin D at which risk was reduced. More >>
Calcium and Vitamin D for Girls
February 01, 2011
In a recently published study, girls ages 9 to 13 were given, twice a day, a supplement with calcium and vitamin D. After 6 months, significant increases were found in bone density and strength compared to girls who received placebo. Get the amounts and types of calcium and vitamin D taken, as well as more information, in the Review of Calcium Supplements or the Review of Vitamin D Supplements.
