Antioxidant function of glutathione. GST: glutathione transferase; Download Scientific Diagram How Keeping Glutathione Levels Up Can Benefit Your Health & Your Vitamin D Status GrassrootsHealth The antioxidant glutathione ScienceDirect Glutathione The Master Antioxidant With Enormous Benefits Wellness By Rosh Integrative Wellness 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,