Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification 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, You've probably heard of antioxidants, but did you know that glutathione is one of the MOST powerful ones your body makes? It's working 24 7 to detoxify your cells, protect against oxidative stress, Glutathione: our body's defence against severe inflammatory response triggered by Covid 19