Understanding Antioxidants: Roles and Benefits Explained Sacramento Glutathione (GSH) is a crucial endogenous "master" antioxidant that protects the heart by reducing oxidative stress, neutralizing lipid peroxides, and preventing cell death. Low glutathione levels are consistently found in Glutathione IV Therapy: What You Need to Know What is glutathione? Know as the most important antioxidant in the body, glutathione is an essential antioxidant manufactured in all cells, but primarily in the liver. It is essential because it