Glutathione, a tripeptide found in virtually all cells, functions as a reducing agent. The structure of glutathione is: What amino acids make up glutathione? Homework.Study.com 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 Supersmart SAcetyl Glutathione 300 mg Per Day GSH Tripeptide Antioxidant Protects Against Damage DNA Cells NonGMO L Glutathione reduced glutathione