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As a result its biologic activity is normally completely inactivated when orally ingested because of its very low bioavailability

Glutathione is a critical component of the immune system, as it is an important intracellular water-soluble antioxidant.* As part of this function, glutathione plays a vital role as the cofactor for the antioxidant enzymes glutathione peroxidase and glutathione transferase

PubMed CrossRef Gomolin IH, Smith C, Jeitner TM

Learn what a recent study found in our answer to the question: Which supplements help with Raynaud's phenomenon

It is a tripeptide with gamma peptide linkage between the carboxyl group of the glutamate side-chain and the amine group of cysteine, and the carboxyl group of cysteine is attached by a normal peptide linkage to a glycine