Video: Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation 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 a critical soldier in our line of defense that our bodies make it themselves. We even have mechanisms that recycle and reuse it. But what happens when our toxic Glutathione molecule. Molecular chemical structural formula and model of tripeptide that made of the amino acids glutamate, cysteine, and glycine. Ske Stock Vector Image & Art Alamy