why take vitamin c with glutathione 25% + Clinical Serum L-Glutathione Complex Capsules - 90

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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

Journal of orthopaedic research, 28 (9), 1155-1161

22 In one study, glycine supplementation decreased insulin resistance in rats by boosting glutathione production, providing the liver with a protective metabolic benefit