Critical Roles of the CysteineGlutathione Axis in the Production of Glutamyl Peptides in the Nervous System Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation The Emerging Roles of Glutamyl Peptides Produced by Glutamyltransferase and the Glutathione Synthesis System Glutathione, our master antioxidant, is built from cysteine, glycine, and glutamine. Low levels of these amino acids on testing may signal impaired production. Cysteine is key, with glycine close