<prompt> Glutathione is aDipeptidePolypeptideTripeptideOligopeptide  <response>: Glutathione is -glutamyl cysteinyl glycine, i.e. glutathione is a tripeptide made up of 3 aminoacyl residues - Glutamate, Cysteine, Glycine Gluta - Glutamate Thi- Sulfur containing Cysteine One- Glycine 1 C amino acid Glutathione is the major intracellular reducing substanceanti-oxidant SH group of glutathione is responsible for its antioxidant function. 