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, HEALTH ALERT The Philippine Dermatological Society (PDS) emphasizes that IV glutathione or glutathione drip is ILLEGAL and NOT FDA approved for skin lightening. There is currently no scientific evidence to support Glutathione an overview ScienceDirect Topics Glutathione Amino Acids: Why Supplements May Not Work