The Rockefeller University How the antioxidant glutathione keeps mitochondria healthy General reaction mechanisms for antioxidant glutathione peroxidase Download Scientific Diagram How Keeping Glutathione Levels Up Can Benefit Your Health & Your Vitamin D Status GrassrootsHealth 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 IV Therapy: What You Need to Know