8 Foods Containing the Highest Quantity of Glutathione Foods With L Glutathione: Avocado, Watermelon, and More GoodRx Foods High In Glutathione Natural Ways to Increase Your Glutathione Levels 15 Effective Foods to Boost Glutathione Levels Naturally Glutathione is a powerful antioxidant made by the body that helps protect cells, support detoxification, and promote healthy, glowing skin. These foods naturally help boost and protect glutathione levels supporting skin health