Glutathione: The Master Antioxidant Glutathione is often called the body's "master antioxidant" and for good reason. This powerful tripeptide (made from cysteine, glycine, and glutamate) is produced naturally in your cells, Glutathione is such an important antioxidant in human physiology, meaning it acts to combat oxidative stress. Strategies for increasing glutathione include: Consume sulfur rich foods like cruciferous vegetables Ensure you get Catabolism of extracellular glutathione supplies cysteine to support tumours Nature Amazon.com: Genestra Brands Glutathione Precursors Antioxidant Support Supplement 30 Capsules : Health & Household