Figure 3 from Glutathione synthesis. Semantic Scholar Frontiers Cysteine Depletion, a Key Action to Challenge Cancer Cells to Ferroptotic Cell Death NAC and Glutathione: The Amino Acid the Supplement Industry Is Not Telling You About NAC [N AcetylCysteine] is a precursor of Glutathione. PICTURE: Glutathione is made from three amino acids and cysteine is one of them Amino Acid Metabolism for Human Physiology Springer Nature Link Amino Acid Derivatives biochemistry