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CL Answer

What is the best sunscreen based on safety and efficacy?

We’ve boiled down the latest research about mineral and chemical sunscreens, including product tests, to help you choose the best sunscreen (which will depend on whether you expect to be in or out of the water). We also list popular sunscreens that have, or have not, been found to contain cancer-causing compounds (benzene and benzophenone).

Carcinogens in Sunscreens - Bottle of sunscreen with a question mark

CL Answer

What' the Best Way to Take Vitamin B-12? Dosage and Absorption Tips

Discover the optimal dosage and ways to take vitamin B-12, an essential nutrient, for better absorption and effectiveness and learn about possible side effects.

Vitamin B12 Dosage, Benefits, Uses & Deficiency -- B12 Bottle and Tablets

Product Review

Cinnamon Supplements and Spices Review

CAUTION: Some Cinnamon Products High in Toxin. See Which Passed or Failed and our Top Picks!

Cinnamon Supplements and Spices Tested by ConsumerLab.com

CL Answer

I thought the B vitamins were all water soluble and did not build up in the body, so you would not build up toxic levels. Am I wrong?

Learn more about water-soluble B vitamins including niacin, B6, B12 and folic acid, and why taking too much of these vitamins can be toxic. See the symptoms of overdose and toxicity from B vitamins. ConsumerLab.com's answer explains.

B Vitamins

CL Answer

How does Athletic Greens’ AG1 compare to multivitamins and Greens powders? Is AG1 worth it?

ConsumerLab reviews the ingredients in AG1, its safety and possible side effects, and how AG1 compares to other products.

A pouch of AG1 on white background

CL Answer

Can taking too much vitamin B-12 be dangerous? The label on my B-complex states it contains 50,000% of the Daily Value!

Find out the daily value for vitamin B-12 and the potential side effects of taking too much B-12. ConsumerLab explains why taking too much vitamin B-12 can be harmful.

The danger of taking too much vitamin B-12 -- bottle of vitamin B-12 with pills on the table spelling out 'B-12'

CL Answer

What does "%DV" (Daily Value) mean on a supplement label, how does it differ from RDAs, and should anyone take more than the DV for a nutrient?

Find out the difference between RDAs (Recommended Daily Allowances) and DVs (Daily Values) for vitamins and minerals, and learn whether certain groups of people should take more than the 100% DVs for vitamins and minerals.

Multivitamin Daily Value Percentages Close Up

CL Answer

Desiccated Beef Liver and Beef Organ Supplements: Nutrition & Safety

Description of desiccated beef liver, including what it is used for, its nutrient content, and safety concerns.

Beef liver powder

CL Answer

Which is the best mask to prevent COVID-19 and how do cloth, disposable, N95, and KN95 masks compare? How can I stop glasses from fogging?

See our Top Picks for masks. Learn how to make COVID-19 masks from materials at home that can be almost as effective as surgical mask and N-95 masks.

Four masks shown for comparison

Recalls & Warnings

November 06, 2014

Seller of Cholesterol, Arthritis Supplements and More Warned for Drug Claims

On October 17, 2014, the FDA issued a warning letter to Vitamins Direct (USA) and Golden Pride, Inc., which distribute Flexezy and Physician's Signature brands of dietary supplements, following a facility inspection which found statements made about certain supplements to be drug claims.

News Release

June 25, 2019

ConsumerLab Tests Reveal Best B Vitamin Supplements -- 19% of B Vitamin Supplements Fail CL's Tests of Quality

White Plains, New York, June 25, 2019 — B vitamins and complexes are among the most popular supplements sold in the U.S. because B vitamins are essential for a wide range of functions in the body.

Recalls & Warnings

April 17, 2020

Seller of Vitamin D, MSM, Selenium & More Warned for Drug Claims

On March 31, 2020, the FDA issued a warning letter to KetoKerri LLC following a review of the company's website, which found statements made about some of the company's products, including Dr.

Recalls & Warnings

February 10, 2018

Warning to D-Limonene, Vitamin C Seller

On January 31, 2018 the FDA issued a warning letter to Long Life Unlimited, LLC following a review of the company's website which found promotional statements and testimonials made about products including Balance 600, D-Limonene, Rapha Remedy, Rapha Remedy w/ p73 Wild Oregano, Vitamin C, ...

Recalls & Warnings

May 03, 2013

Homeopathic Company Warned For Drug Claims and Improper Labeling

On March 12, 2013, the FDA issued a warning letter to Natural Medicine Associates, Inc.