About glutathionetripeptide with an unusual peptide linkage between the amine group of cysteine (which is attached by normal peptide linkage to a glycine) and the carboxyl group of the glutamate side-chain.mechanism of action of glutathionepowerful antioxidant- co-factor in phase i hepatic detoxification- involved in synthesis of dna & proteins, amino acid transport, enzyme activation, immune system function.