What is Glutathione IV Used For? Fallbrook Medical Center Glutathione: The Bodys Master Antioxidant, ., ., Glutathione (GSH) is often referred to by scientists and nutritionists as the "Master Antioxidant." Unlike other antioxidants like Vitamin C or E, FDA highlights concerns with using dietary ingredient glutathione to compound sterile injectables FDA Glutathione is the most critical antioxidant and detoxifier made by the body and one that is easily depleted in the face of chronic exposure to toxins. If you don't eat enough protein you