6 of 12 Top-Selling Glutathione Supplements on Amazon Fail Label Claims in Independent Testing, Cata-Kor Finds

Cata-Kor, a U.S.-based nutraceutical company focused on science-informed longevity formulations, released results from independent laboratory testing of 12 top-selling glutathione supplements purchased from Amazon.com in April 2026. Of the 12 products tested, 6 failed to meet their label claims for glutathione content.