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Biomater Adv (2022) 133:112616

Furthermore, any intact glutathione that does manage to cross the intestinal wall is immediately routed to the liver via the portal vein, where it is subjected to heavy "first-pass metabolism." Because of this rigorous digestive and hepatic breakdown, early pharmacokinetic studies demonstrated that standard oral glutathione often fails to significantly boost serum or intracellular levels, rendering many traditional, over-the-counter supplements highly ineffective for chronic illness management

Product quality varies significantly among manufacturers, and the actual amount of bioavailable peptide reaching target tissues may be a fraction of what the product label suggests

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