Glutathione is:
Glutathione (GSH) is a tripeptide. It contains an unusual peptide linkage between the amine group of cysteine and the carboxyl group of the glutamate side chain. Glutathione, anantioxidant, helps protect cells from reactive oxygen species such as free radicals and peroxides. Glutathione is not an essential nutrient since it can be synthesized from the amino acids L-cysteine, L-glutamic acid and glycine.
Dipeptide
Oligopeptide
Tripeptide
Polypeptide