Food High in Glutathione with Chemical Formula of Glutathione. Natural Food Sources of Glutathione Include Fruit and Vegetable Stock Image Image of liver, food: 300102829 Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation As I mention in my book, N acetyl cysteine (NAC) is not found in food sources, but in the body, it converts into cysteine. NAC acts as a precursor to glutathione, a powerful Boost Glutathione for Better Health and Brighter Skin InVita Wellness