Glutathione Reductase human Glutathione is a small protein made of three amino acids. It is often called the master antioxidant because it helps regenerate other antioxidants like vitamin C and vitamin E. Key Benefits Deni GLUTATHIONE A naturally occurring protein that protects every cell, tissue, and organ from toxic free radicals and diseases. Throughout the stages of aging, cells begin to lose their ability to Glutathione Related Enzymes and Proteins: A Review