5 Route of synthesis of glutathione (GSH) involving three amino acids Download Scientific Diagram Glycine as a conditionally essential amino acid and its relationship to l serine Metabolism Clinical and Experimental Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation 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,