Supplements Glutathione 500mg Whole Food Enriched Antioxidant Foods containing glutathione The 7 Best Glutathione Foods Foods Highest in Glutathione Glutathione Understanding the Powerful Master Antioxidant Glutathione is known as the master antioxidant. This critical compound protects cells from damage caused by free radicals and toxins, supports detoxification, plays a key role in DNA synthesis and repair, Glutathione is known as the body's master antioxidant and detoxifier. Found in large quantities in the liver, it's key to supporting the immune system.