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Product Review

Kelp Supplements Review

Choose the Best Kelp Supplement. Be Cautious With Kelp! Only 50% of Supplements Pass CL's Review.

Kelp Supplements Reviewed by

Product Review

Resveratrol Supplements Review (From Red Wine, Knotweed, and Other Sources)

See Which Resveratrol Supplements Were Best In Our Tests and Comparisons. Learn What Resveratrol Can and Can't Do.

Review of resveratrol supplements tested by, including ratings and comparisons of product quality, price, and ingredients.

Product Review

D-Mannose Supplements

Find out if D-mannose helps prevent urinary tract infections and how products compare.

D-Mannose Review 2023

CL Answer

Can D-mannose help prevent urinary tract infections?

Learn more about D-mannose and its impact on urinary tract infections (UTIs), including evidence from clinical studies.

Woman with UTI holding her hands over her lower abdomen

News Release

April 25, 2017

Caution with Kelp Supplements: May Contain Too Much Iodine

White Plains, New York, April 25, 2017 — Kelp supplements are promoted as a natural source of iodine, an important mineral for healthy thyroid function. But are they a good alternative to regular iodine supplements? To find out, ConsumerLab.

News Release

January 25, 2006

Sexual enhancement supplements analyzed by

WESTCHESTER COUNTY, NEW YORK — JANUARY 25, 2006 — announced today that it found only six out of eleven supplements used for sexual enhancement to contain key ingredients listed on their labels and meet other quality criteria.

Recalls & Warnings

February 27, 2018

Testosterone, Thyroid, Other Supplements Recalled Due to Undeclared Milk

On February 23, 2018, Progressive Laboratories, Inc., issued a recall of the following four supplements because they may contain undeclared milk:

Recalls & Warnings

March 13, 2020

FDA Finds Problems at 52% of Supplement Manufacturing Sites in U.S. and 42% Abroad has obtained results of the FDA's inspections in Fiscal Year 2019 (October 1, 2018 - September 30, 2019) of 598 dietary supplement manufacturing facilities in the U.S.

Recalls & Warnings

March 12, 2016

FDA Finds Problems at 58% of Supplement Manufacturing Sites in U.S. and Abroad has obtained results of the FDA's inspections in Fiscal Year 2015 (ending September 30) of 483 dietary supplement manufacturing facilities, showing that most -- 58.2% -- received letters indicating noncompliance with current Good Manufacturing Practices (cGMPs).