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. Testing was conducted by Swift Laboratory, an ISO 17025:2017-accredited third-party testing facility (ANAB Certificate No. AT-2969), using HPLC — the standard analytical method for quantifying reduced glutathione in dietary supplements.
The findings point to a broader quality problem in the glutathione category on Amazon, where liposomal and high-dose products have proliferated without consistent independent verification.
