Glutathione: The Master Antioxidant And How to Support It Naturally If you've heard of glutathione, you've likely seen it called the master antioxidantand for good reason. It plays a central Glutathione's role as a master antioxidant in plant defense system. Download Scientific Diagram Glutathione 500 mg Plus 21st Century Vitamins 21st Century Vitamins The Power of Glutathione Known as the master antioxidant, glutathione works from the inside out to support total wellness. Boosts detoxification Supports immune health Promotes brighter, clearer