Why Glutathione is Called the 'Master Antioxidant' and What It Means f Setu Nutrition Glutathione: What It Is, Why You Need It, How You Can Increase It The Amino Company Glutathione is often called the master antioxidant for a reason This powerhouse works at a cellular level to support overall wellness, not just surface level glow. Here's what it actually does: Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification