Reviews and Information for Lysine (L-lysine)
Lysine Supplements
Read our review to find the best lysine (l-lysine) supplements, avoid pitfalls with labels, and learn whether lysine helps for cold sores (herpes simplex labialis), genital herpes lesions, and canker sores. Plus lysine dosage, safety and side-effect information. Find out which ones passed our tests and why.
Lysine Supplements Review
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News Release
August 31, 2023
Some L-Lysine Supplement Labels May Be Misleading, According to ConsumerLab Tests
White Plains, New York, August 31, 2023 — Lysine (L-lysine) supplements may help prevent cold sores, genital herpes lesions, and canker sores, and are also promoted to slow hair loss, and treat herpes infections in cats.
CL Answer
Can any vitamins or minerals help prevent or reduce canker sores or cold sores?
Find out which, if any, supplements, including iron, L-lysine, monolaurin, olive leaf extract, vitamin B-12, and zinc, may be beneficial for canker sores or cold sores.
Clinical Update
1/16/2024
Lysine for Sleep?
Does taking lysine improve sleep? Find out in the What It Does section of our Lysine Supplements Review, which includes our Top Picks for L-lysine.
Also see: Which supplements and lifestyle changes improve sleep, and which cause insomnia?
Clinical Update
11/08/2022
L-lysine For Hair?
Can supplementing with L-lysine help slow or reverse hair shedding? Find out what research suggests and who might benefit in our updated CL Answer about supplements for hair.
CL Answer
What are human growth hormone (HGH) supplements? What are the benefits? Are they safe?
Learn about the benefits and risks of human growth hormone (HGH) supplements and injections. Get science-based insights on usage and effects.
Product Review
Olive Leaf Extract Supplements Review
Learn What Olive Leaf Does and the Best Brands
CL Answer
Can beetroot juice or supplements lower blood pressure or improve exercise performance, and are they safe?
Learn more about beetroot juice and beetroot supplements and if beetroot can really help lower blood pressure.
News Release
February 09, 2016
Lysine: Does It Work for Cold Sores and Which Brands Are Best? -- ConsumerLab.com Reviews the Evidence and Tests Supplements Often Used to Prevent Herpes Eruptions
White Plains, New York, February 9, 2016 — Lysine is an essential amino acid often taken as a supplement to prevent cold sores, genital herpes lesions, and canker sores. It's also given to cats with feline herpesvirus 1.
CL Answer
Which supplements can cause diarrhea?
Can supplements like magnesium cause diarrhea? Find out which supplements may cause diarrhea, such as vitamin B12, curcumin, magnesium, vitamin C and fish oil.
CL Answer
What’s the Best Way to Get High-Quality Protein from Food?
Find out the best way to get high-quality protein from animal or plant-based food instead of supplements.
CL Answer
Which supplements and lifestyle changes improve sleep, and which cause insomnia?
Find out which vitamins may help you sleep and learn if any vitamins or supplements can cause insomnia.
Product Review
Lion's Mane and Chaga Supplements Review
Read Labels Carefully -- Many Can Mislead
Product Review
Electrolytes & Sports Drinks Review
See Which Sports Drinks, Powders, and Pills Deliver the Right Electrolytes
Product Review
Lavender and Tea Tree Essential Oils Review
Oils Tested for Authenticity and Purity
Clinical Update
7/20/2019
Zinc for Canker Sores?
We've added information about zinc to our answer to the question: Can lysine, vitamin B-12, or other vitamins or minerals help prevent or reduce canker sores?
Clinical Update
9/06/2023
Supplements for Cold Sores
Do lysine, monolaurin, or olive leaf extract help prevent or treat cold sores? Find out in our updated article about supplements for canker sores and cold sores.
CL Answer
Do any supplements help with COVID-19? Do supplements like vitamin D, zinc, vitamin C, or herbals work?
Find out if natural remedies & supplements for coronavirus such as zinc, vitamin C, garlic, or elderberry help to prevent or treat COVID-19.
Recalls & Warnings
August 14, 2023
Liver Injury Linked to "Immune Booster" Supplement Sold on Amazon
A 27-year-old woman in Pennsylvania was admitted to intensive care for drug-induced liver injury after taking Prodigy Life HRP-AID, a supplement sold on Amazon and promoted as an "immune system booster" to reduce the intensity and frequency of cold sore outbreaks, according to a ...
Recalls & Warnings
December 31, 2020
FDA Warns Seller of Flu Immune
On December 21, 2020, the FDA issued a warning letter to Riverstone LLC for selling the products Flu Immune Drops, L-Lysine, Lysine Extra, and Monolaurin with unsupported claims that they can treat coronavirus (COVID-19).
CL Answer
Can drinking coffee prevent gallstones? Can supplements help?
Information about the impact coffee has on gallstone disease. Plus, supplements that have been proposed to help with gallstone pain.
CL Answer
Do any supplements help prevent or reduce eye floaters?
Find out eye floaters (vitreous floaters) be treated with supplements like vitamin C, lutein, ginkgo, milk thistle, collagen or hyaluronic acid, or with products such as VitreousHealth.
CL Answer
Top 8 vitamins and nutrients for vegetarians and vegans
Find out which 8 supplements may be needed by vegetarians or vegans to meet all their daily nutrient requirements and learn ways to find supplements that do not contain ingredients objectionable to people following vegetarian or vegan diets.
CL Answer
Are L-carnosine supplements helpful and safe?
Learn about the potential health benefits of L-carnosine, as well as possible safety concerns, drug interactions and cost.
Recalls & Warnings
September 28, 2022
FDA Warns Muscle Sports for Joint Health, Immune & Workout Supplement, Vitamin C, Elderberry, and Other Claims
On September 23, 2022, the FDA issued a warning letter to Muscle Sports Products, LLC following inspection of the company’s websites which found statements about company products, including Join Revolution Capsules, IMMUNITY + Powder, Rhino Rampage PUMPED Capsules, Attack Pre-Workout ...
Recalls & Warnings
August 13, 2016
Seller of Omega-3, Ginkgo, Vision Supplements & More Warned for Drug Claims
On July 22, 2016, the FDA issued a warning letter to Viva Nutraceuticals (J & E International Corporation) following a review of the company's website and promotional literature, which found statement made about its products, Eyestonia, Ginkgo Biloba 60mg, Golden Omega-3 Max, ...
Recalls & Warnings
October 24, 2012
FDA Seizes Many Supplements from New York Company Due To Drug Claims
On October 23, 2012, U.S. Marshalls, acting on behalf of the FDA, seized dietary supplements and unapproved drugs from Confidence, Inc., a supplement manufacturer in Port Washington, N.Y. The products included dietary supplements Dr.
Recalls & Warnings
March 04, 2016
Federal Court Shuts Down Seller of Supplement Promoted for Herpes
On February 26, 2016, a federal court ordered dietary supplement company Viruxo LLC to stop selling its product Virux, which was promoted to treat herpes.
Recalls & Warnings
March 15, 2013
Maker of Liquid Supplements Warned For Manufacturing Violations and Drug Claims
On January 31, 2013, the FDA issued a warning letter to Liquid Health, Inc.
Recalls & Warnings
February 06, 2016
Seller of Turmeric, Milk Thistle and More Warned for Manufacturing Violations, Drug Claims
On January 15, 2016, the FDA issued a warning letter to Terra Firma Botanicals, Inc.
Recalls & Warnings
April 29, 2014
Seller of B Vitamins, CoQ10, Amino Acids and Other Supplements Warned for Manufacturing Violations and Drug Claims
On April 1, 2014, the FDA issued a warning letter to Bio-Recovery, Inc.
Recalls & Warnings
March 04, 2008
Airborne Settles Lawsuit Over False Advertising of its "Miracle Cold Buster"
On March 4, 3008, the Center for Science in the Public Interest (CSPI) announced that the makers of Airborne -- a multivitamin and herbal supplement whose labels and ads falsely claimed that the product cures and prevents colds -- will refund money to consumers who bought the product, as part of a ...
