Food rich in glutathione: broccoli, cauliflower, banana, spinach, carrot, orange, avocado, onion, nuts. Glutathione is an antioxidant; helps make proteins in the body; has a variety of health benefits Stock Photo An Ode to the Avocado Nutrition Therapy Institute Arvada, CO Embrace Glutathione Rich Foods Novoceuticals Avocado is also consider food that fight #stress. This is rich in glutathione, a substance that specifically blocks intestinal absorption of certain fats that cause oxidative damage.