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 Is Glutathione the Master Antioxidant? Heres What Science Says Glutathione and Vitamin C: Better Together? Performance Lab Achieve a radiant glow and support strong immunity with Watsons Glutathione, Vitamin C and Vitamin E! These three powerful antioxidants help boost collagen production and protect your skin from free radicals. Glutathione, Cysteine and C Life Extension Immune Health