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 Recent advances in separation methods for characterization of glutathione metabolism and dietary supplementation ScienceDirect Glutathione Depletion and Stalwart Anticancer Activity of Metallotherapeutics Inducing Programmed Cell Death: Opening a New Window for Cancer Therapy ACS Omega Amazon.com: Glutathione Supplement 1,000mg Per Serving, 98% Purity Plus Vitamin C 500mg, Active Reduced Form (GSH) Intracellular Antioxidant Supports Detoxification & Immune Health : Health & Household