L-Glutathione is a tripeptide made from glutamic acid, cysteine and glycine. Foodstuffs such as pig liver, meats (beef, pork), bread yeast, kiwi fruit contain high L-glutathione. L-Glutathione is also included in almost all human cells, especially in the liver. L-Glutathione plays an important role in protecting living cells from the toxicity of the reactive intermediates. It is critically important as an antioxidant for the deoxidization and detoxification of hydrogen peroxide and fatty acid peroxides in the body. Moreover, L-Glutathione helps antioxidant vitamins C and E recycle from their oxidized form into reduced form in the cell. Additionally, in cell assays and animal studies, it was reported that L-glutathione inhibited tyrosinase activity and suppressed melanin production through anti-oxidative effect. L-Glutathione is also used as a dietary supplement (in the USA).
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