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CL Answer

Is it true that taking glucosamine might make my glaucoma worse?

Learn if taking glucosamine may make glaucoma worse, including overall impact on eye health.

Review of Supplements for Joint Pain

CL Answer

What is Brain Bright and can it really improve memory or cognition?

Learn more about BrainBright, including clinical studies on memory and cognition, safety, and cost.

Product Review

CBD & Hemp Extract Supplements, Lotions, and Balms Review

Find the Best CBD at the Lowest Price! Learn How Much CBD (and THC) Is Really in Products and Which Are Our Top Picks.

CBD and Hemp Oils Reviewed by

CL Answer

Does Longevinex resveratrol really help for age-related macular degeneration?

Longevinex resveratrol information including how it helps age-related macular degeneration & clinical evidence.

CL Answer

What are the side effects of glucosamine and chondroitin?

Learn the side effects of glucosamine and chondroitin supplements for joint health and joint pain, including stomach upset, headache, and many others.'s answer explains.

Review of Supplements for Joint Pain

Product Review

Joint Health Supplements Review (Glucosamine, Chondroitin, MSM, Boswellia, Collagen and Turmeric)

One-Third of Joint Health Supplements Failed to Pass Our Tests. See Which Passed or Failed, and our Top Picks.

Review of Supplements for Joint Pain

Product Review

Ginkgo (Ginkgo Biloba) Supplements Review

Choose the Best Ginkgo Biloba Supplement. Finding Real Ginkgo Isn't Easy — 60% Fail ConsumerLab's Tests of Quality.

Ginkgo Biloba Supplements Tested by

CL Answer

Do hair loss supplements, such as Viviscal, Hair La Vie, and Nutrafol, or topical essential oils work?

Vitamins and supplements that may help with hair loss and thinning, including saw palmetto, beta-sitosterol, protein, iron, and vitamin D.

Supplements for Hair Loss -- woman looking at hairbrush

Clinical Update


Glucosamine May Increase Eye Pressure

New research suggests that people with glaucoma or intraocular hypertension could have worsening eye pressure if they take a glucosamine supplement. Get the details (along with our tests of glucosamine and other joint health supplements) in the updated Glucosamine/Joint Health Supplements Review >>

Clinical Update


Glucosamine & Eye Pressure

Glucosamine may increase eye pressure in people with glaucoma or intraocular hypertension. But does it have this effect in people who don't have these conditions? See what a new study found in the Concerns and Cautions section of the Joint Health Supplements Review. Also see our Top Picks for glucosamine and chondroitin.

CL Answer

Which supplements help with Raynaud's phenomenon?

Raynaud's phenomenon may be helped by some supplements. Learn more about fish oil, Gingko biloba, and ginseng.

Supplements for Raynaud's Phenomenon -- woman standing outside in snow, with cold, red hands

Product Review

Choline and Lecithin Supplements Review (Including Phosphatidylcholine, CDP-Choline, and Alpha-GPC)

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.

Supplements for Coronavirus (COVID-19)? -- mask and pills

CL Answer

Are light boxes effective for preventing and treating seasonal affective disorder (SAD), also known as "winter depression," or circadian rhythm disorders such as jet lag? Which light boxes are best?

Learn about the benefits and safety of light boxes (including who is most likely to benefit), how to use these devices, which commercially available products appear to meet the technical requirements, and who should not use light boxes.

Man reading a book while sitting in front of a light box

Product Review

Alpha Lipoic Acid Supplements Review

Choose the Best Alpha-Lipoic Acid Supplement. Some Alpha-Lipoic Acid Supplements Cost 13 Times As Much As Others -- But Is It Worth Paying More?

Alpha-Lipoic Acid Supplements Reviewed by

Recalls & Warnings


Young Living Warned for Promoting Essential Oils to Treat Seasonal Allergies, Kidney Stones & More

On June 10, 2022, the FDA issued a warning letter to Young Living Essential Oils Corporate after an inspection of the company’s website and social media found statements about the company’s essential oil and CBD products to be drug claims.

Recalls & Warnings


Seller of Tea, Colloidal Silver, Homeopathic Products Warned for Manufacturing Violations

On September 12, 2019, the FDA issued a warning letter to Herbal Healer Academy, Inc.

Recalls & Warnings


FTC Crackdown on Six Deceptive CBD Products

On December 17, 2020, the FTC announced that it is taking action against six companies for selling CBD products with unsupported and deceptive health claims that they can treat a variety of conditions, including cancer, heart disease, hypertension, Alzheimer's disease, and others.

Recalls & Warnings


Seller of Vision, Cholesterol, Prostate Supplements and More Warned for Drug Claims

On May 25, 2017, the FDA issued a warning letter to Herbal Doctor Remedies following a facility inspection and review of the company's websites,, and www.theraherb.

Recalls & Warnings


Hemp Oil and Cannabidiol (CBD) Marketers Warned by FDA Over Claims

On November 1, 2017, the FDA announced it issued warning letters to four companies promoting products containing cannabidiol (CBD), a compound derived from cannabis (also known as marijuana), for the treatment of cancer, as well as other diseases, such as Alzheimer's disease. In the U.

Recalls & Warnings


Seller of Gingko and Milk Thistle Warned for Manufacturing Violations and Drug Claims

On April 4, 2014, the FDA issued a warning letter to Xtra Life Natural Systems, Inc.

Recalls & Warnings


"The Truth About Nutrition" Marketers Agree to Pay $3 Million to Settle Charges of Deceptive Advertising of Dietary Supplements and Devices

On March 6, 2008, the Federal Trade Commission (FTC) announced that marketers of dietary supplements and health-related devices have agreed to pay $3 million in consumer redress to settle FTC charges that they deceptively claimed their products treated or prevented a wide variety of serious ...

Recalls & Warnings


Cannabis Compound Not Permitted in Supplements, FDA Warns

On February 4, 2016, the FDA issued warning letters to eight companies selling products containing cannabidiol (CBD), a compound derived from cannabis (also known as marijuana). In the U.S., cannabidiol is not permitted to be sold as an ingredient in dietary supplements.