One of the most potent antioxidants your body makes is glutathione, a.k.a. the mother of all antioxidants. Every cell in your body contains glutathione and its main job is to protect your Foods High in Glutathione Dr. Christina Carlyle Because glutathione levels decline as you age, and glycine can help slow the glutathione slide, it's a good idea to keep your levels high by eating protein rich foods, like organic poultry, grass fed 15 Effective Foods to Boost Glutathione Levels Naturally