Dog Safe Snacks: What Foods Are Rich in Glutathione? Earth Buddy Pet 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 Use of Glutathione, Pure or as a Specific Inactivated Yeast, as an Alternative to Sulphur Dioxide for Protecting White Grape Must from Browning Boost your body's natural detox and immunity with these top glutathione supporting foods! Extra Tip: Exercise, get quality sleep, and reduce processed foods to naturally increase glutathione levels. Follow for more healthy tips,