Natural Ways to Increase Your Glutathione Levels Foods like garlic, avocados, spinach, and asparagus are known to be good sources of glutathione, or can help boost the bodys natural production of it. Additionally, consuming sulfur rich foods like Garlic Nutrition Facts and Health Benefits Some Patients Are Taking Glutathione, Should You? Southern California Integrative Wellness Center 7 Powerful Natural Sources of Glutathione for Optimal Health