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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

As a small molecule, it is resistant to digestive degradation, easily absorbed through the intestinal wall (79% bioavailability), and can be manufactured using conventional chemical synthesis at a fraction of the cost of peptide production

Clarified extracts (10,000 g for 10 min at 4 C) were subsequently rotated with 15 l of packed Flag agarose M2 affinity beads (Sigma-Aldrich, A2220) for 1 h at 4 C

5e and Supplementary Fig