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, Glutathione is often called the body's master antioxidant for good reasonit helps detoxify, protect cells, and boost immunity. Supporting your natural levels starts with daily choices like eating sulfur rich foods (broccoli, garlic, The antioxidant glutathione ScienceDirect