Glutamyl Cycle Mode of action of Glutathione Amino acid Precursors (GAP) and functions Download Scientific Diagram 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, Pyroglutamic acidosis by glutathione regeneration blockage in critical patients with septic shock Critical Care Springer Nature Link Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation