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The supplement industry markets glutathione as stable and forgiving, but the pharmacology is clear: reduced glutathione oxidizes predictably and irreversibly when exposed to heat
Anabolic peptides add to it
Nevertheless, since GSH cannot be administered directlybecause of its insufficient absorption, stability and solubilityanalogues have been obtained, through modifications at the -glutamyl, cysteine and glycine moieties, and/or the functionalisation of the central cysteine, that are able to inhibit the activity of GSTs 69,87,105
1993;2(7):S29-32
Taken orally, glutathione has inherently low bioavailability as it faces two key obstacles: the strong acidity of gastric juices and the action of a liver enzyme called gamma-glutamyltranspeptidase (GGT) which catalyzes the first stage of its breakdown (8)
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