glutathione soap side effects on skin Gluta C Whitening – & Vitamin C Glutathione Soap: Benefits, Safety, Results
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Gao, X.-J

Molecular cloning and characterization of -glutamyltranspeptidase from Pseudomonas nitroreducens IFO12694
This testing matters because manufacturing processes can introduce harmful substances

Besides undergoing 7-dehydroxylation during colonic transit, the hydroxy groups on the steroid nucleus may be modified by dehydrogenation, epimerization, or even elimination to form an unsaturated bile acid (with a double bond in the steroid nucleus)