Disrupting Mitochondrial Pyruvate Uptake Directs Glutamine into the TCA Cycle away from Glutathione Synthesis and Impairs Hepatocellular Tumorigenesis: Cell Reports Glutathione is an antioxidant that's made up of the three amino acids glutamine, glycine, and cysteineall of which are rich in the mineral sulfur. The main functions of glutathione are to fend off Critical Roles of the CysteineGlutathione Axis in the Production of Glutamyl Peptides in the Nervous System Research Breakdown on Glutamine Examine What Is Glutathione? A Summary of Glutathione Lifespan Research Institute