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[DOI] [PubMed] [Google Scholar] 3.Amores-Sanchez M.I., Medina M.A

The tripeptide chemical nature of glutathione means that it is hydrolyzed rapidly by intestinal and hepatic gamma-glutamyltransferase, which hampers it from reaching clinically effective levels in the blood and reaching the cells that need it most

PLoS ONE 10 , e0122696 (2015)

Malic enzyme 1(ME1) is frequently overexpressed in cancers, and catalyzes the reversible oxidative decarboxylation of malate to pyruvate, yielding NADPH from NADP + , ME1 as a major cytoplasmic source of NADPH

However, beneath the surface, the impact can be more extensive damaging Collagen and Elastin, compromising the skin's natural barrier, and sparking inflammation along with oxidative stress