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, Figure 2 from Regulation of neuronal glutathione synthesis. Semantic Scholar Glutatione En Glutathione Amino Acids: Why Supplements May Not Work Glutathione Metabolism in Renal Cell Carcinoma Progression and Implications for Therapies