Foods With L Glutathione: Avocado, Watermelon, and More GoodRx Vibrant Glutathione contains sulfur molecules, which may be why foods high in sulfur help to boost its natural production in the body. These foods include: cruciferous vegetables, such as broccoli, Natural Ways to Boost Your Glutathione Levels (Without Expensive Supplements) How to increase glutathione levels: 4 natural ways Foods With L Glutathione: Avocado, Watermelon, and More GoodRx