3/25/2020

Surprising Role of Potassium in COVID-19

New research out of China suggests that many patients hospitalized with COVID-19 are low in potassium. For details see the information about Potassium in our answer to the question: What are natural remedies for coronavirus (COVID-19)? Do supplements like zinc, vitamin C, or herbals work?

4/08/2022

Andrographis for COVID-19?

Despite early evidence suggesting a benefit, andrographis does not appear to help patients with COVID-19, according to a recent report. Get the details in our updated answer to the question: Do any supplements help with the coronavirus (COVID-19)?

2/23/2022

Vitamin D for COVID?

Does high-dose vitamin D help people hospitalized with COVID? See what a recent study showed 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)?

2/04/2022

Vitamin D & Death From COVID

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)?

6/13/2020

Vitamin D and COVID-19 Risk

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.

9/14/2021

L-Arginine for COVID?

Did L-arginine supplementation help people with severe COVID-related pneumonia? See what a new study found in the What It Does section of our L-Arginine Supplements Review.

Also see: Do any supplements help with the coronavirus (COVID-19)?

7/04/2020

Vitamin D & Coronavirus

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.

7/15/2022

Fraudulent COVID-19 Tests

Several unauthorized COVID antigen tests have been sold recently in the U.S., according to the FDA. Get the details in our answer about testing for coronavirus.

11/11/2021

Sleep, Drink, and COVID Hospitalization Risk

Lack of sleep and frequent consumption of certain beverages may each increase the risk of being hospitalized if you get COVID-19, according to a recent study. Get the details in our updated answer to the question: How are you staying healthy during the coronavirus pandemic?

12/30/2021

Hand Sanitizer vs. Soap

How do hand sanitizers or disinfectant hand wipes compare to washing hands with soap and water to remove microbes without causing skin dryness and redness? Find out what a recent study showed in the Hand sanitizer section of our answer to the question: Does heat kill coronavirus (COVID-19)?

5/17/2022

Omicron Lasts on Surfaces

The Omicron variant of the coronavirus was recently shown to last on surfaces longer than the original (Wuhan) virus. Get the details and possible implications in our answer about COVID-19 disinfection.

5/09/2023

At-Home COVID Test Recalled

Certain lots of a popular at-home COVID test sold by CVS and Amazon has been recalled due to bacterial contamination. Get the details in our article about testing for coronavirus.

12/16/2023

A Probiotic for COVID-19?

Did supplementing with a popular probiotic reduce the risk of developing COVID-19 symptoms among people exposed to a household member with COVID-19? Find out in the COVID-19 section of our Probiotic Supplements Review, which includes our Top Picks among probiotics.

11/01/2024

COVID and Flu Home Tests Compared

There are now 38 different COVID-19 home antigen tests (7 that also test for flu), but we found big differences in how well they detect COVID (ranging from 59.7% to 96.6% sensitivity) and avoid false negatives. See our comparison chart and learn our Top Picks for testing for COVID and COVID/Flu.

Also, every U.S. household is now eligible to get 4 at-home COVID-19 tests. Find out how (unfortunately, you can’t choose the brand).

11/29/2022

When New Boosters Are Most Helpful

The updated Pfizer and Moderna boosters appear to help protect against symptomatic COVID-19, particularly among people who haven’t had a COVID-19 shot in several months, according to a recent study. Get the details in the Updated COVID-19 Boosters section of our CL Answer about COVID-19 vaccines.

3/19/2024

Probiotic for COVID?

Did a probiotic promoted to support immune defenses against COVID-19 help prevent or treat COVID-19? Find out in our Probiotics Supplements Review, which includes our Top Picks among probiotics.

Also see: Do any supplements help with COVID-19? Do supplements like vitamin D, zinc, vitamin C, or herbals work?

2/11/2022

Melatonin & COVID

Can supplementing with melatonin help prevent death among people hospitalized with COVID-19? See what a recent study found in the COVID-19 section of our Melatonin Supplements Review, which includes our Top Picks for melatonin.

Also see our answer to the question: Do any supplements help with COVID-19?

11/23/2021

Reduced "Long" COVID-19 Risk with Vaccination

Getting vaccinated before or even after having COVID-19 has been linked with reduced risk of "long" COVID.

9/14/2021

COVID Vaccination and Menstruation

Does COVID-19 vaccination affect menstruation? Find out what is known in our article about COVID-19 Vaccines.

9/09/2022

Booster After COVID?

If you recently had COVID, can you delay getting the new booster? Find out in the Updated COVID-19 Boosters section of our CL Answer about COVID-19 vaccines.

Also, find out if the updated boosters are available without cost.

3/01/2022

Melatonin to Prevent COVID?

Does taking melatonin help prevent COVID-19? Find out what a study found in the COVID-19 section of our Melatonin Supplements Review.

Also see our article about Supplements for COVID.

12/20/2020

Melatonin for COVID-19?

Can melatonin reduce the duration of symptoms in people with COVID-19? Get the details in the COVID-19 section of our Melatonin Supplements Review. Also, see our Top Picks for melatonin.

1/10/2021

Vitamin D and COVID-19

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.

10/27/2020

Vitamin D and COVID-19

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.

10/31/2020

Vitamin C for COVID-19?

Does high-dose vitamin C help people critically ill with COVID-19? Find out what a new report showed in the COVID-19 section of our Vitamin C Supplement Review. Also see our Top Picks for vitamin C.

11/26/2020

Vitamin D for COVID-19

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.

1/13/2021

High-Dose Vitamin C for COVID-19?

Does high-dose vitamin C help in people with severe COVID-19? See what a new study showed in the COVID-19 section of our Vitamin C Supplements Review.

6/02/2020

Vitamin D for COVID-19 Patients

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.

6/20/2020

Low Potassium in COVID-19 Patients

Patients hospitalized with COVID-19 have often been found to have low potassium levels. Should you be concerned? Learn more in the COVID-19 section of the Potassium Supplements Review. Also see our Top Picks among potassium supplements.

10/13/2020

Low Vitamin D & COVID-19 Risk

Studies indicate that vitamin D deficiency may increase the risk of COVID-19 infection. The most recent study suggests this risk may be greater among certain ethnic groups. Learn more in the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.

6/09/2020

A Role for Calcium in COVID-19?

A preliminary study suggests a possible role for calcium supplementation in treating COVID-19. See the details in the COVID-19 section of the Calcium Supplements Review. Also see our Top Picks among calcium supplements.

1/18/2022

Probiotics for COVID-19 Symptoms?

Can a probiotic help resolve COVID-19 symptoms? Learn what a recent study showed in the COVID-19 section of our Probiotic Supplements Review.

3/01/2022

COVID-19 and Hair Loss?

Can COVID-19 cause hair loss? Find out in How to You Take Care of Yourself After You’ve Had COVID-19.

5/20/2022

Gromwell Root for COVID-19?

Can gromwell root (an ingredient in the supplement Tollovid) help treat or prevent COVID-19? See what the latest research shows in our article about supplements for COVID-19.

6/07/2022

Managing COVID-19 Rebound

Some people experience COVID-19 recurrence after being treated with the antiviral drug Paxlovid. Find out what is recommended when this happens in our updated CL Answer about COVID-19 treatments.

7/15/2022

New Vaccine Authorized

The FDA has authorized the Novavax COVID-19 vaccine, which will likely be made available next week. Find out how it differs from the other COVID-19 vaccines, learn about its effectiveness against COVID-19, and get details about possible side effects.

11/22/2022

Paxlovid & COVID-19 Rebound

Does Paxlovid treatment put one at higher risk for COVID-19 rebound than non-treatment? Find out in the Paxlovid section of our article about COVID-19 treatments.

11/11/2022

Paxlovid May Reduce Risk of Long COVID

Taking Paxlovid after testing positive for COVID-19 reduced the risk of long-term symptoms. For details, see our CL Answer about COVID-19 treatments.

10/11/2022

Paxlovid COVID Rebound?

A recent study sheds light on what may account for COVID-19 "rebound" among people treated with Paxlovid. Get the details in our updated CL Answer about treatments for COVID-19.

6/17/2022

Travel Requirements Updated

The CDC no longer requires that travelers show a negative COVID-19 test or documentation of recovery from COVID-19 before boarding a flight into the U.S. Get the details about what is still recommended in the Travel section of our article about COVID vaccines.

7/29/2022

Vitamin D for COVID-19?

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.

7/19/2022

Vaccines & Long COVID

Are COVID-19 vaccines helpful with long COVID? Find out.

9/16/2022

Caution with Vitamin C for COVID

Taking very high-dose vitamin C doesn’t seem to provide protection against COVID-19 and it may increase the rate of kidney stones, according to recent data. Get the details in the Vitamin C section of our CL Answer about Supplements and COVID-19.

6/14/2022

Curcumin for COVID?

Does curcumin supplementation reduce symptoms such as cough, sore throat, and shortness of breath in people with mild to moderate COVID-19? See what a recently published study found in the What It Does section of our Turmeric and Curcumin Supplements and Spices Review.

Also see our article about other supplements proposed to help prevent or treat COVID-19.

3/18/2022

Best COVID Vaccine for Breast-Feeding Women?

For women who are breast-feeding, find out which COVID-19 vaccines are most likely to result in antibodies against COVID-19 in breastmilk.

2/23/2022

Paxlovid for COVID-19?

How well does Paxlovid reduce risk of hospitalization or death due to COVID-19 in people who are unvaccinated? Find out in our updated answer about COVID Treatments.

7/08/2020

Vitamin D and COVID Severity

Another study suggests a link between having an adequate level of vitamin D and the severity of COVID-19 in patients. For details, see the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.

8/18/2020

Vitamin D Deficiency & COVID Death Risk

A new study suggests a link between vitamin D deficiency and higher risk of death in COVID-19 patients. For details, see the COVID-19 section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.

10/13/2020

Zinc and Risk of COVID Death

A recent study found low blood levels of zinc to be associated with a greater chance of severe symptoms and death in COVID-19 patients. Does this mean that people should supplement with zinc or use zinc lozenges? Find out in the COVID-19 section of our Zinc Supplements and Lozenges Review. Also see our Top Picks for zinc supplements and lozenges.

10/24/2020

High-Dose Vitamin D for COVID?

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.

1/15/2021

Vitamin K & Risk of COVID Death

A marker of low vitamin K levels has been linked to a higher risk of death in people with COVID-19, according to a new study. Get the details in the COVID-19 section of our Vitamin K Supplements Review.

8/03/2021

Tests to Detect COVID Variants?

Can standard COVID-19 tests identify which variant caused an infection? Find out in our updated CL Answer about tests for COVID-19.

11/23/2021

COVID-19 Vaccines and Menstruation

Do COVID-19 vaccins affect menstrual periods? Find out what a recent study suggests.

1/11/2022

COVID-19 and Menstrual Cycles

Do COVID-19 vaccines affect menstrual cycles? Find out what the latest research shows.

2/25/2022

Zinc & COVID

Can taking zinc and vitamin C after being diagnosed with COVID-19 boost antibody production? Find out what a recent study found in the COVID section of our Zinc Supplements Review.

Also see our article about Supplements for COVID.

9/21/2021

Medicine Helps Prevent COVID Symptoms

An FDA-authorized medicine was shown to reduce the risk of developing symptoms of COVID when given early to people testing positive for COVID. Get the details in our answer to the question: Do any treatments reduce the risk of infection after you've been exposed to someone with COVID-19?

7/08/2022

Supplement for Post-COVID Fatigue?

Did supplementing with oxaloacetate reduce symptoms in people with post-COVID fatigue in a recent study? Find out in the Strategies for managing long COVID section of our article about How to Take Care of Yourself After You’ve Had COVID-19.

8/17/2021

COVID Risk of Death

Which factors increase the risk of death from COVID-19 among adolescents?

8/10/2021

Asymptomatic COVID & Transmission

Can you spread COVID-19 if you are asymptomatic?

8/10/2021

COVID Home Test Limitations

COVID-19 home tests, like the 15-minute Abbott BinaxNOW, have significant limitations in real-world use according to a recent study.

9/28/2021

COVID + Flu Shot Timing

Find out if you can get a flu shot and COVID-19 shot at the same time and how this may affect side effects.

9/28/2021

Flu Shot and Risk of COVID Complications

Getting a flu shot may actually reduce the risk of serious complications if you get COVID-19.

9/03/2021

Fibromyalgia After COVID

How common is fibromyalgia (widespread musculoskeletal pain) after COVID-19? Find out what a study showed.

11/02/2021

Low-Dose Prednisone and COVID Vaccines

Find out if taking low-dose prednisone reduces immune response to the COVID-19 vaccine.

11/15/2021

Flu & COVID Vaccines

Additional research indicates that it's safe to get flu and COVID-19 vaccines together. Get the details.

11/15/2021

Protection from Past COVID Infection?

Find out if past COVID-19 infection protects against re-infection 12 months later based on two recent studies.

2/23/2022

Vaccination After COVID Infection

Getting vaccinated after COVID-19 appears to drastically reduce the risk of reinfection, according to a recent study.

1/25/2022

Timing Vaccines Around COVID Drugs

Learn how long you need to delay vaccination after receiving drug therapy for COVID-19, including antivirals (such as remdesivir and Paxlovid) and antibody treatments.

3/22/2022

Vitamin D & COVID

Does vitamin D boost immune response to COVID-19 vaccines? Find out.

12/01/2023

COVID Vaccines: What to Know

Learn about the new COVID-19 vaccines including who should get them, who shouldn’t, and potential side effects.

5/21/2024

Andrographis Health Effects

Find out if andrographis helps with conditions such as cancer, COVID-19, and multiple sclerosis in our article about the health benefits and safety of andrographis.

Also see: Do any supplements reduce symptoms or relapse of multiple sclerosis?

Also see: Do any supplements help with COVID-19?

10/27/2023

Vitamin C & COVID

Did large, frequent doses of vitamin C help people hospitalized with COVID? Find out in the COVID-19 section of our Vitamin C Review. Also see our Top Picks for vitamin C.

9/26/2023

Creatine for Post-COVID Fatigue?

Does supplementing with creatine reduce fatigue or other symptoms in people with post-COVID fatigue syndrome? Find out what a recent study showed in the Creatine - What It Does section of our Muscle & Workout Supplements Review. Also see our Top Picks for creatine.

Also see: How Should You Take Care of Yourself After You’ve Had COVID-19?

8/15/2023

Vitamin D & COVID-19

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.

10/14/2022

Updated Booster for Younger Kids

The updated COVID-19 boosters are now authorized for younger age groups. Get the details in our article about COVID-19 vaccines.

10/25/2022

Is It Okay to Take Pain Relievers After COVID-19 Vaccination?

A recent study looked at whether taking OTC pain relievers after vaccination reduced antibody responses to the vaccines. See what the study showed in the Can Pain Relievers / Fever Reducers Be Taken to Lessen Side Effects section of our CL Answer about COVID-19 vaccines.

11/29/2022

When Paxlovid is Most Helpful

Paxlovid can reduce the risk of hospitalization due to COVID-19, but new data indicates for whom it is most helpful. Get the details in our updated CL Answer about medications for preventing or treating COVID-19.

12/13/2022

COVID Booster for Young Children

Children as young as 6 months may be able to get an updated COVID booster. Get the details about who is eligible for which vaccines in our CL Answer about COVID-19 vaccines.

3/31/2023

Quercetin and Antivirals

Be aware that quercetin might reduce the effectiveness of some antivirals, including an antiviral in Paxlovid used to treat COVID-19. Get the details in the Concerns and Cautions section of our Quercetin Supplements Review, which includes information about other potential interactions with quercetin, as well as our Top Picks among quercetin supplements.

Also see our CL Answer about Supplements for COVID-19.

3/18/2022

Blood Type & Long COVID

People with a particular blood type appear more likely to experience long COVID, according to a recent study. Get the details in our answer to the question: How Should You Take Care of Yourself After You've Had COVID-19?

6/14/2022

Duration of EVUSHELD Protection

How long does the medicine EVUSHELD protect against COVID-19? Find out what recent data showed in our article about medicines to prevent and treat COVID-19.

7/12/2022

How to Get Paxlovid Without a Medical Doctor

Pharmacists can now directly prescribe Paxlovid for people with COVID-19, but there are limitations. Find out what you need to bring to the pharmacy to get Paxlovid if you've tested positive and are at risk for severe COVID-19.

7/12/2022

Reinfection Risks

Learn how soon after COVID-19 you can get infected again with the Omicron BA.5 variant, which is now dominant in the U.S. and, as we have reported, is more transmissible than earlier variants.

Be aware that getting COVID-19 more than once has been associated with increased risk of developing a variety of health problems, according to recent research.

7/15/2022

Protection Due to Infection?

How well does a previous COVID-19 infection protect against BA.4/BA.5 infection? It depends on which COVID-19 variant caused the initial infection, according to a recent study.

6/28/2022

COVID-19 Tests for Sight Impaired

People with blindness or low vision can now order more accessible COVID-19 tests from the government. Get the details.

7/01/2022

Don't Throw Out Expired COVID Tests

The shelf-lives of home COVID-19 tests have been extended by 3 to 7 months based on tests showing that many are still good past their printed expiration dates. Get the details for specific brands of tests in our article comparing COVID tests.

7/08/2022

Omicron BA.5 On the Rise

A new Omicron subvariant, BA.5, has become the dominant SARS-CoV-2 strain in the U.S. Find out how well this virus escapes protection from vaccination or previous infection, and learn if it causes more severe COVID-19 infection, in the Omicron section of our CL Answer about COVID-19 vaccines.

10/04/2022

Problem With a Preventive Drug

EVUSHELD (tixagevimab with cilgavimab) is the only product authorized for the pre-exposure prevention of COVID-19, but evidence shows it may provide less protection against Omicron variants compared to earlier strains. Get the details in our CL Answer about treatments for COVID-19.

8/12/2022

How Many Times Should You Test?

After exposure to COVID-19, how many times should you test? It may be more times than you think, according to a recent study. Get the details in the Antigen Tests section of our CL Answer about COVID-19 Testing.

8/05/2022

GABA for COVID?

Does taking GABA help with COVID? Find out what’s been shown in our updated answer to the question: Do any supplements help with COVID-19?

3/01/2022

Check Your Area’s COVID Risk

You can now check if your area in the U.S. is at High, Medium, or Low risk for COVID and the CDC's mask recommendations for your area. Check your community's COVID-19 level.

1/21/2022

Rapid COVID-19 Tests At No Charge

People in the U.S. can now order 4 at-home rapid COVID-19 tests at no charge. Get the details.

1/21/2022

Is Epstein-Barr Virus Reactivated By COVID-19 Vaccines?

Do COVID-19 vaccines cause reactivation of Epstein-Barr virus? Find out.

8/10/2021

Herbal Treatment

Are traditional Chinese medicines, such as astragalus, helpful in treating or preventing COVID-19? Find out what reviews of the research have concluded in our article about Supplements and COVID-19.

8/07/2021

COVID Transmission Among Vaccinated?

Can you catch COVID from someone who is vaccinated if you are vaccinated? Find out what data suggests in our article about COVID-19 Vaccines.

8/07/2021

Vaccination in People Who've Already Had COVID

How much protection do vaccines provide to people who've already had COVID? See what a recent study suggests in our article about COVID-19 Vaccines.

1/13/2021

Vitamin D & Risk of COVID Death

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.

7/18/2020

Selenium & COVID-19

Selenium-deficient people were more likely to die from COVID-19 than those who were not deficient according to a recent study. For details, see the What It Does section of the Selenium Supplements Review. Also see our Top Pick for selenium.

10/20/2020

Melatonin and COVID-19

Can melatonin supplementation reduce the risk of death in people with severe COVID-19? See what a recent study showed in the What It Does section of our Melatonin Supplements Review. Also see our Top Picks for melatonin.

4/28/2020

A Role for Vitamin K in COVID-19?

A new study showed a link between vitamin K and the development of COVID-19. Learn what this means in the What It Does section of our Vitamin K Supplements Review. Also see our Top Pick among vitamin K supplements.

6/14/2020

Do Zinc Lozenges Help?

Several individuals diagnosed with COVID-19 began using zinc lozenges after they became sick. Find out if this was reported to help or not in the COVID-19 section of the Zinc Supplements Review. Also see our Top Picks for zinc supplements and lozenges.

8/05/2022

Do Eyeglasses prevent COVID?

Did wearing eyeglasses or sunglasses in public reduce the risk of getting COVID-19? Find out what a recent study showed in our CL Answer about face shields.

7/19/2022

COVID + Flu Vaccines

Getting a COVID-19 vaccine along with a flu shot seems to slightly increase the risk of side effects, according to a recent study. Get the details.

5/13/2022

Paxlovid Interaction With Supplements

Paxlovid is strongly recommended for COVID treatment, but be aware that it may interact negatively with certain supplements, as well as many drugs. Get the details in CL Answer about COVID-19 treatments.

6/07/2022

Caution Reading Rapid Tests

Many people incorrectly read rapid home tests for COVID-19, according to a recent study. Find out how to avoid the biggest mistake in our article about COVID tests.

8/17/2021

COVID Infectiousness

Be aware that even without symptoms, people with COVID-19 can emit high amounts of virus as aerosols, according to recent research. Get the details and find out what researchers recommend to help protect yourself when indoors.

11/18/2021

Black Seed for COVID?

Can supplementing with black seed help improve symptoms or prevent severe disease among people with COVID-19? Find out what research suggests in our answer to the question: What are the health benefits of black cumin seed (black seed) oil?

11/05/2021

Quercetin & COVID

Find out if quercetin helped people with early-stage COVID-19 in a recent study. Details are in the Viral Infections section of our Quercetin Supplements Review, which includes our test results and Top Picks among quercetin supplements.

12/07/2021

Quercetin for Severe COVID?

Does quercetin help people with severe COVID-19? See what a recent study suggests in the Viral Infections section of our Quercetin Supplements Review. Also see our Top Picks for quercetin.

8/28/2021

Biotin Interference With COVID Tests

Be aware that taking biotin (vitamin B-7) may interfere with COVID-19 antibody tests. Learn which tests are affected. Also find out about other laboratory tests (including thyroid and cardiovascular tests) that can be affected by biotin.

10/02/2021

Booster for Fully Vaccinated People Who've Had COVID?

Should fully vaccinated people who had COVID-19 get a booster? Find out.

1/28/2022

CBD To Reduce COVID Risk?

Use of a prescription formula was associated with lower risk of COVID-19 infection in a recent analysis, but there are important caveats to this finding. Get the details in the Colds, Flu, and Viral Infections section of our Review.

8/25/2021

Ivermectin

More information highlights why ivermectin should be used for COVID-19 only within clinical trials. Get the details.

8/03/2021

Ivermectin

Find out why ivermectin is generally not recommended for COVID-19 outside of clinical trials, despite some research suggesting a benefit.

9/14/2021

Vaccines Compared: Pfizer, Moderna, or J&J

See which vaccine (Pfizer, Moderna, or J&J) now appears to provide greatest protection against COVID-19-related hospitalization.

8/28/2021

J&J Booster Vaccine

Data suggests that a booster dose of the J&J vaccine can significantly boost immune protection against COVID-19. Get the details.

2/01/2022

Vaccines, Blood Pressure, and Thyroid Symptoms

Find out if COVID-19 vaccines increase blood pressure or worsen symptoms of thyroid conditions.

2/01/2022

Reinfection From Omicron

Be aware that if you had COVID-19 before Omicron, you’re a lot more likely to get reinfected now.

5/20/2022

At-Home Tests

You can now order 8 more COVID-19 antigen tests from the government. Get the details.

4/29/2022

Vaccines and Appendicitis

Do COVID-19 vaccines increase the risk of appendicitis? Find out.

Starting this week additional COVID-19 tests are available to U.S. residents without cost. Get the details.

3/29/2022

Benefit of a Second Booster

Second boosters may significantly reduce the risk of severe COVID-19 in older people, according to a recent study.

7/19/2022

Booster Benefit

Getting a second booster can significantly reduce the risk of COVID-19 hospitalizations among people 50 and older, according to a recent study.

6/21/2022

COVID-19 Vaccination for Young Children

Find out how the newly authorized vaccinations for young children differ from each other in terms of dosing and number of doses.

3/31/2020

Is Quercetin Safe?

Quercetin has been proposed as a treatment for a range of medical conditions, including COVID-19, but is it safe? Find out what studies have found, including results of a recent, small clinical trial, in the Concerns and Cautions section of the Quercetin Supplements Review. Also see our Top Picks for quercetin.

4/14/2020

Zinc Concern

Zinc is a popular supplement right now due to COVID-19, but be aware that taking large doses of zinc for a long period of time can suppress the immune system by causing or exacerbating copper deficiency. Certain people may be more at risk for this. Get the details in the Cautions and Concerns section of the Zinc Supplements and Lozenges Review.

11/23/2021

COVID-19 Booster Shots: Who is Eligible?

Anyone over age 18 is now eligible for a booster six months after full mRNA vaccination or two months after the J&J vaccine, but find out which people are specifically encouraged to get a booster.

11/26/2021

COVID-19 Booster Shots & Antibodies

How much antibody boost does a booster give? Much more than a second vaccine dose, a previous infection, or both, according to recent findings.

11/26/2021

Fiberglass HEPA Filters

Are HEPA filters made out of fiberglass safe to use inside a home? Find out in our updated answer to the question: Which air purifiers are best for reducing the spread of COVID-19?

12/28/2021

Air Purifiers for Odor Removal?

Can air purifiers that remove virus particles from the air also eliminate odors? Find out in the Technologies for Removing Odors section of our answer to the question: Which air purifiers are best for reducing the spread of COVID-19?

Also see our Top Picks among air purifiers.

1/07/2022

Rapid, Home PCR Tests Compared

Should you use a home PCR test for COVID-19 instead of a home antigen test? Find out and learn which of three authorized home PCR tests is our Top Pick.

1/07/2022

Testing After Isolation?

The CDC and American Medical Association have differing views on whether you should test negative before ending isolation due to COVID-19 infection.

8/31/2021

N95 Mask Quality Problem

Federal approval was recently revoked for all N95 masks made by a certain manufacturer. Get the details in our article about the Best Masks to Prevent COVID-19.

10/02/2021

AstraZeneca Vaccine Efficacy & Side Effects

Find out how effective the AstraZeneca vaccine (not currently available in the U.S.) is at preventing COVID-19. Also learn the most common side effects of the AstraZeneca vaccine.

2/04/2022

Shelf-Lives of Home COVID-19 Antigen Tests

If you’re storing a test for future use, be aware that shelf-lives range from just 5 ½ months to 12 months from time of manufacture. See how shelf-lives of popular brands compare.

Also see our Top Picks among antigen tests based on their accuracy and other features.

2/08/2022

What To Do If You Test Negative, or Positive

We’ve summarized the latest information about when to use a home test and what to do if you get a negative, or a positive result. It’s all in the Antigen Tests section of our comprehensive article about testing for COVID-19.

1/28/2022

Treatment Against Omicron

Find out which COVID-19 treatments (pills and infusions) are effective against Omicron and which are not.

Also learn how the length of hospital stays differs with Omicron versus Delta.

1/21/2022

Supplement Interactions with Paxlovid

Certain supplements may interact with Paxlovid, the antiviral pill authorized for COVID-19 patients at high risk for severe disease. Find out which may interact.

9/09/2022

Who Benefits Most from Paxlovid?

The efficacy of Paxlovid against severe COVID-19 infection may largely depend on the person's age, according to a recent study.

8/09/2022

How Long Are You Contagious?

If you test positive on a rapid antigen test after a 5-day isolation, how likely are you to still be contagious? Find out in our CL Answer about COVID-19 testing.

3/08/2022

Is 5-Day Isolation Enough?

More evidence suggests that isolating after a positive COVID-19 antigen test result for just 5 days may be too short.

5/20/2022

Pfizer Booster for Children

A Pfizer vaccine booster for children is now authorized by the FDA. Get the details in our updated article about COVID-19 Vaccines.

5/24/2022

2nd Booster Recommendations

The CDC has strengthened its recommendation for the 2nd booster for people 50 and older and those 12 and older who are immunocompromised. Find out what prompted this change in our updated CL Answer about COVID-19 vaccines.

6/01/2022

Disinfectants With Hypochlorous Acid

Are disinfectants with hypochlorous acid, such as Force of Nature and CleanSmart effective alternatives to harsher cleaning chemicals? Find out in our article about COVID-19 and Disinfecting.

12/16/2022

Home PCR Test Recall

Certain lots of an over-the-counter PCR test have been recalled, affecting over 11,000 tests shipped to consumers. Get the details in our answer about COVID-19 tests.

9/02/2022

Omicron-Targeting Boosters

The FDA has now authorized updated Pfizer and Moderna boosters. Find out who is eligible to get these shots and when, and learn who can still get the original boosters, in our updated CL Answer about COVID-19 vaccines.

3/17/2020

How Long Does Coronavirus Last On Surfaces?

We've added new information about how long the coronavirus might last on packaging, and how this varies greatly depending on the package material, in our answer to the question: Can I get the new coronavirus (2019-nCoV) from supplements from China?

10/21/2022

Who's Most Likely to Get Severe COVID?

Among people who were vaccinated but later got COVID, a new analysis shows who’s mostly likely to get severe COVID depending on vaccine brand, age, medications taken, and health conditions. See the details in our article about COVID vaccines.

9/07/2021

COVID Symptoms in Breakthrough Cases

Fully vaccinated people who get COVID are much less likely to experience symptoms, as well as long-COVID, than unvaccinated people with COVID to according to a recent study. Get the details.

11/11/2021

Long COVID Symptoms Not Due to COVID?

A recent study suggests that "long COVID" symptoms reported by some people may not be due to COVID. Find out why this is of concern.

11/18/2021

Fish Oil for COVID?

Does taking concentrated fish oil reduce hospitalizations or deaths in people with COVID? Find out what a study showed in the COVID section of our Fish and Marine Oil Supplements Review.

11/09/2021

COVID Booster & Risk of Spreading Infection

A booster reduces the amount of virus you produce if you get COVID, according to a recent study. This should help reduce the risk of spreading infection if you get COVID.

11/09/2021

Antibody Levels: Having Had COVID vs. Being Vaccinated

How does having had COVID compare to being vaccinated in terms of antibody levels? See what a recent study found, as well as the effect of vaccination after having had COVID.

12/07/2021

Chances of COVID Reinfection with Omicron Variant

If you've had COVID, be aware that the chance of getting COVID a second time is much higher with the Omicron variant than with previous variants, according to recent data.

9/11/2021

Flu Vaccine & COVID

Learn if you need to time your flu vaccine around your COVID vaccine and how the flu vaccine may affect you if you later get COVID. Also find out when kids should get a flu shot.

9/24/2021

Resveratrol for Mild COVID?

A recent study gave resveratrol to people with mild COVID. Find out if it reduced hospitalization, ER visits or pneumonia in the What It Does section of our Resveratrol Supplements Review.

See information about the use of other supplements for COVID.

9/28/2021

Risk of Infecting Others

While vaccines are good at keeping you from getting severely ill from COVID, be aware that if you get COVID, you may be as infectious as a non-vaccinated COVID patient, according to several recent reports.

2/11/2022

Vitamin D & COVID

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.

9/26/2023

COVID Tests

Each U.S. household can now order a set of four at-home COVID tests from the government. Get the details in our article about the best COVID tests.

12/27/2023

Best At-home COVID Tests -- Updated

Find out which at-home COVID tests are most accurate, easy to use, and currently available in our updated article, which includes performance comparisons and our Top Picks among at-home COVID tests.

8/30/2022

Four More Days to Get COVID Tests

If you haven't already ordered yours, you have only until September 2 to receive at-home COVID tests from the U.S. government without cost. These may be particularly useful if cases rise in the fall and winter. Get the details in our article about Finding the Best COVID Tests.

10/08/2021

Shingles Vaccine & COVID

Does getting a shingles vaccine reduce COVID risks?

10/08/2021

Home COVID Test Recalled

Certain lots of a popular home COVID test have been recalled after they were discovered to provide inaccurate results.

10/09/2021

Substance Abuse & COVID

People with substance use disorders, particularly regarding cannabis, may be at increased risk for COVID infection, according to a recent study.

9/03/2021

Kidney Injury and COVID

Kidney injury appears to be more common in some people who have had COVID, according to a recent study.

8/31/2021

Adolescents & COVID: Myocarditis vs. Hospitalization

How does the risk of myocarditis from vaccination compare to the risk of hospitalization from COVID among adolescents?

8/31/2021

Off-Label Use of COVID Vaccine?

Find out why vaccine administrators may decline to give COVID shots for off-label use.

8/28/2021

15-Minute Home COVID Tests

Demand for 15-minute home tests for COVID is increasing. Learn when and how to use these tests.

12/24/2021

At-Home COVID Testing

Best time to take an at-home COVID test? It may be sooner than you think.

1/11/2022

Booster After COVID?

Find out if you should get a booster after getting COVID.

1/14/2022

At-Home COVID Tests Without Charge

Find out where to get COVID tests without charge in your area and how to get reimbursed for buying at-home antigen tests (which starts tomorrow).

11/15/2021

COVID Vaccines & Shingles

Do COVID vaccines activate shingles? Find out what research suggests.

8/14/2021

COVID Vaccination During Pregnancy

Vaccination is now recommended during pregnancy. Get the latest details in our article about COVID Vaccines.

10/04/2022

Two More Home COVID Tests Compared

We've added information about tests from Celltrion and Indicaid to our comparisons of 12 home antigen tests for COVID.

3/04/2022

Caution: Many Still Positive After 5 Day Isolation

People with COVID must isolate for 5 days, but many are positive on antigen tests for up to 9 days. Find out who is most at-risk for this, in our updated answer about COVID Tests.

3/31/2022

How to Get COVID Treatment Quickly

Antivirals work against COVID if given early. Some pharmacies can now give you antiviral medication without a prescription from your doctor if you test positive, saving valuable time. Learn how and find the location nearest you.

3/25/2022

No-Cost COVID Vaccine Eligibility Ending?

Take note: After April 4, some people in the U.S. may no longer be able to get a COVID vaccine without paying out of pocket.

9/02/2022

CoQ10 for Post-COVID Fatigue?

Can CoQ10 supplementation reduce physical and mental fatigue in people experiencing prolonged COVID symptoms? See what a recent study found in the What It Does section of our CoQ10 Supplements Review.

8/05/2022

Vitamin C or Melatonin for COVID?

Find out if supplementing with vitamin C or melatonin reduced symptoms in people with mild to moderate COVID in a recent study.

10/02/2024

Low-dose Lithium for Long COVID?

Did taking low-dose lithium improve symptoms of long COVID? Find out what a recent study showed in the What It Does section of our Low-Dose Lithium Review, which includes our Top Picks for low-dose lithium.

5/05/2023

May 11 Deadline for Tests

Until May 11, U.S., households are eligible to receive four at-home COVID tests from the government if not already ordered this year. Get the details in our article about COVID Tests, which includes our Top Picks among at-home rapid antigen tests.

12/02/2022

Don’t Throw Out Expired COVID Tests

The shelf-life for some at-home COVID antigen tests was recently extended by several months - so don't throw them away! Get the details by brand.

2/15/2022

New COVID Treatment

An antibody treatment that works against Omicron infection was recently authorized for people at high risk of progression to severe disease, but it needs to be used early. Learn more about it and other treatments in our answer about COVID treatments.

Learn about the waning efficacy of COVID vaccines, why the booster is being offered, why at 8 months, as well as who can get it, when and how.

12/16/2020

High-Dose Fish Oil for COVID?

A two-week course of high-dose, high-concentration fish oil was reported to reduce inflammation and symptoms in COVID patients in a preliminary study. See the details in the What It Does section of the Fish Oil Supplements Review. Also, see our Top Picks for fish oil supplements.

11/05/2021

Flu Shot + COVID Booster?

Find out if it's okay to get a flu shot at the same time as a COVID booster based on recent evidence.

10/12/2021

More About Shingles Vaccines & COVID

We recently reported that getting a shingles vaccine was linked to lower COVID risk. A CL member asked us if this association applied to Shingrix, Zostavax or both vaccines. See the answer.

12/10/2021

Home COVID Tests

Details are still being worked out, but see the latest information about how the U.S. government intends to make COVID self-tests freely available or reimbursable depending whether you are insured, uninsured, or covered by Medicaid or Medicare. Also see our Top Pick among 7 brands of home tests.

12/03/2021

Best Rapid Home Test for COVID

The FDA has authorized many 15-minute home tests for COVID, but some are better than others at identifying positive samples. See our Top Pick among rapid home tests and how brands compare.

Be aware that these home tests, which can be bought without a prescription, are best used within six days of the start of symptoms. It is likely that they can detect the new Omicron variant. The cost of buying these tests may soon be covered by insurance.

12/03/2021

Home Pulse Oximeter Use Decreases Risk of COVID Death

Using a pulse oximeter at home to monitor blood oxygen levels was associated with a significant decrease in risk of death among people with COVID, according to a new study. Get the details and see our Top Pick among pulse oximeters.

12/07/2021

More COVID Home Tests Reviewed — See If They Made Our Cut

The FDA recently authorized many more over-the-counter rapid (antigen) home tests for COVID, but there are significant differences in their accuracy.See how 7 widely sold brands compare, where we've set the bar between the best and the rest, and our Top Pick. Just yesterday, we added information about four more tests.

8/28/2021

Six or Eight Months for mRNA COVID Booster?

Will mRNA booster vaccines be given as early as 6 months after the first dose, or at 8 months as had been officially announced? Find out in our article about COVID Vaccines.

8/31/2021

Delta Variant Accounts for Most COVID Cases

Be aware that the Delta variant, which is more transmissible than other variants, now accounts for more than 98% of COVID cases in the U.S. See the latest numbers.

8/31/2021

Risk of Hospitalization With COVID

If you are unvaccinated, how much more likely are you to be hospitalized with COVID than if you were vaccinated? See what recent data shows.

10/08/2021

Home Device May Reduce Risk of COVID Death

New evidence suggests that using a pulse oximeter when home with COVID may reduce the risk of death. We've added information about this to our answer to the question: Which is the best pulse oximeter for home use?

9/24/2021

Antibody Therapy for COVID

Due to a shortage in supply, there has been a change in how antibody therapies for COVID are being distributed in the U.S. Find out how this may affect your ability to access these therapies.

8/22/2021

COVID Vaccine and Anemia

Should people with anemia get vaccinated?

8/14/2021

Which Immunosuppressants Reduce Vaccine Protection?

Find out which immunosuppressants may reduce vaccine protection in our article about COVID Vaccines.

8/03/2021

Hospitalization or Death in Vaccinated People

How likely is hospitalization or death from COVID in vaccinated people? See what recent data shows.

10/02/2021

COVID Vaccine for Women Who Are Pregnant

Learn why vaccination is now recommended for women who are pregnant or who can become pregnant.

9/11/2021

Mu Variant

What is the Mu variant and how prevalent is it in the U.S.? Find out in our article about COVID Vaccines.

8/28/2021

Myocarditis Risk

Find out how the risk of myocarditis from vaccination compares to the risk of myocarditis from COVID.

8/28/2021

Are COVID Booster Doses Different?

Are third dose vaccines (for immune-compromised individuals) different from the first two doses?

10/22/2021

Huge Boost from Booster Vaccines

New data showed a huge reduction in symptomatic COVID cases with the Pfizer booster Get the details.

2/18/2022

Myocarditis After COVID Boosters

Myocarditis appears to be much less common with boosters than with 2nd doses of Pfizer or Moderna vaccines according to new data.

2/15/2022

Boosting Vaccine Response

Exercising around the time of a COVID vaccine may help boost immune response, according to a recent study.

2/15/2022

COVID Vaccines and Monoclonal Antibody Therapy

For people who received monoclonal antibody therapy: Find out if you need to delay vaccinations.

8/12/2022

New Recommendations for Quarantine

The CDC has issued new recommendations about what actions should be taken if you’re exposed to someone with COVID.

8/07/2021

COVID Vaccination in People With Neurologic Conditions

Should people with neurologic conditions – including dementia, Alzheimer's disease, MS, and epilepsy – get vaccinated? Find out what experts recommend.

8/10/2021

Pfizer vs. Moderna for Breakthrough Delta Infections

A recent study suggests that Pfizer and Moderna are not equal in protecting against Delta infection. See the details in our article about COVID Vaccines.

8/10/2021

COVID Risk & Immune Disease

Are people with rheumatoid arthritis, psoriatic arthritis, lupus, and other immune diseases at higher risk of severe re-infections? See the latest findings.

8/28/2021

Withdrawal of CDC COVID PCR Test?

Is it true that the current PCR tests for the virus are not accurate and the CDC is withdrawing its own PCR test? Get the facts.

11/02/2021

Pfizer COVID Vaccine for Children

The Pfizer vaccine is now authorized for use in children ages 5 to 11. Get the details about its effectiveness as well as side effects and safety in children. Also, find out why availability of the vaccine may initially be limited.

12/10/2021

Home Pulse Oximeters for anemia?

We recently reported that use of inexpensive home pulse oximeters may reduce the risk of death in people with COVID. But are they useful for other conditions, such as anemia? A member recently asked us about this. Find out in our updated answer the the question: Which is the best pulse oximeter for home use? which includes our Top Picks among home pulse oximeters.

1/14/2022

Mouth v. Nose Swabs for COVID Antigen Testing

Some evidence suggests that samples from the mouth or throat may be better than from the nose but the FDA advises against this with current antigen tests.

9/11/2021

Hunter HP800 Air Purifier Review

See our review of the Hunter HP800 Multi-Room Large Console Air Purifier, as well as our Top Picks among air purifiers, in our article about the Best Air Purifiers for Reducing the Spread of COVID.

9/11/2021

LG PuriCare Mini Air Purifier Review

See our review of the LG PuriCare Mini Air Purifier, as well as our Top Picks among air purifiers, in our article about the Best Air Purifiers for Reducing the Spread of COVID.

10/02/2021

Vaccine-Related Myocarditis in Young Men

See whether Moderna or Pfizer has been linked to a greater risk of myocarditis among young men. (Note: The risk of myocarditis remains much higher from getting COVID than from either vaccine.)

10/02/2021

Sanitizer Warning

Consumers are being warned not to use a specific hand-held UV sanitizing wand that could cause skin or eye injury within seconds of use. Details are in our updated article about UV Light Sanitizers and COVID.

9/17/2021

Vaccines and Shoulder Injury

Shoulder injury from vaccination is not common but can happen. Find out what steps you can take to help avoid it. Also learn about "COVID arm."

2/08/2022

At-Home COVID Testing for Medicare Beneficiaries

In early spring of 2022, eligible Medicare beneficiaries will be able to receive 8 at-home rapid tests per month at no charge. Get the details.

1/28/2022

How Good Are COVID Tests From the Government?

Readers have started to receive rapid antigen tests, such as iHealth, from the government. See how this compares to other antigen tests and our Top Picks.

Let us know which test you received by mail from the U.S. government – we'll review it if we haven't already.

If you need to order tests at no charge, here's how.

1/21/2022

CDC Mask Guidelines

Be aware that, this week, the CDC advised that properly fitted N95 and KN95 respirators provide the highest level of protection against COVID. So it’s best to use these masks in place of cloth masks. It was also announced that N95s will soon be made available at no charge at community centers and retail pharmacies across the U.S. Get the details.

6/21/2022

Vaccine Protection Against Omicron

How well do vaccines protect against Omicron? See how three vaccine doses compared to two doses, or to previous COVID infection, in protecting against symptomatic Omicron infection, based on a recent study.

3/22/2022

COVID Vaccine: Will There Be a Second Booster?

The FDA has received requests from Pfizer and Moderna for a 2nd booster. Find out who might be eligible for a 2nd booster and when.

4/14/2022

Do You Need a Pulse Oximeter at Home?

When home with COVID, a recent study showed that actively monitoring for breathing symptoms may be as or more important than having a pulse oximeter. For details, see our article about pulse oximeters.

10/21/2022

Novavax Booster

The FDA and CDC now allow the Novavax vaccine, which is protein-based rather than mRNA-based, as a booster. Find out who's eligible to get this booster in the Protein-based vaccine section of our article about COVID vaccines.

6/02/2023

Biotin Caution With Lab & At-Home Tests

High doses of biotin from supplements can interfere with a wide range of laboratory and at-home tests, including those for pregnancy, doping, COVID, and heart attacks. Get the details in the Biotin section of our B Vitamin Supplements Review.

Also see: Which vitamins and supplements should be stopped before getting blood work and laboratory tests?

4/04/2023

Hold On To Those Tests

The shelf lives of several at-home COVID antigen tests were recently extended by 3 to 11 months. Get the details in our article about tests, which includes our Top Picks based on performance and price.