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 is an antioxidant that's made up of the three amino acidsglutamine, glycine, and cysteineall of which are rich in the mineral sulfur. The main functions of glutathione are to fend off Catabolism of extracellular glutathione supplies cysteine to support tumours Nature TMP Blog: All About Glutathione Glutathione an overview ScienceDirect Topics The Glutathione System: A Journey from Cyanobacteria to Higher Eukaryotes