Glutathione Benefits for Skin: Brightening, Anti Aging, and More 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, Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation Glutathione: The Ultimate Antioxidant: Pressman, Alan H., Buff, Sheila: 9780312964320: Amazon.com: Books Glutathione in the Brain Encyclopedia MDPI