Glutathione is the body's master antioxidant. It is important for handling oxidative stress, detoxification, and immune health. Low glutathione is linked to many chronic illnesses. Knowing what your body needs to make Glutathione: What It Is, Why You Need It, How You Can Increase It The Amino Company Glutathione The Tripeptide Antioxidant & Reducing Agent 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