The Emerging Roles of Glutamyl Peptides Produced by Glutamyltransferase and the Glutathione Synthesis System Glutathione is the body's primary internal antioxidant, made using the amino acid cysteine, and it helps protect cells from oxidative stress. Beyond detoxification, research shows glutathione is involved in thyroid hormone metabolism, Amazon.com: Young+ Glutathione, Glutamic Acid and Collagen. Antioxidant Supplement 1000mg, 60 Capsules : Health & Household Pyroglutamic acidosis by glutathione regeneration blockage in critical patients with septic shock Critical Care Springer Nature Link