What is Glutathione? What are the Benefits of Glutathione? Glutathione is your body's master antioxidant and one of the most important tools for detox, immune balance, and cellular repair. Low glutathione levels are incredibly common today due to chronic stress, Glutathione Metabolism an overview ScienceDirect Topics Glutathione is nicknamed the master antioxidant because it is the most abundant, body produced (endogenous) antioxidant found in every cell, essential for neutralizing free radicals, recycling other antioxidants (like Vitamin C and E),