What is Glutathione and Why Is It Called the 'Master Antioxidant'? Clinical Glutathione Master Antioxidant The Nutrition Supplement Dietitian Glutathione Injections Glow with Glutathione Known as the master antioxidant, glutathione works deep within your cells to fight oxidative stress, support immunity, and promote radiant skin. At REVIV Hong Kong, we 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: