Glutathione (GSH), a powerful intracellular antioxidant, plays a Download Scientific Diagram 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 is a natural antioxidant your body makes, and it can influence melanin production which is why its sometimes marketed for skin brightening., Oral supplements are mostly broken down in What is glutathione and why must we protect patient access to it? Glutathione: a powerful antioxidant for a healthy skin