6 health benefits of glutathione Liposomal Glutathione Absorption Rate: 8 Clinical Facts You Need to Know WishNew Wellness 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 Glutathione Amino Acids: Why Supplements May Not Work Amazon.com: 2 Pack NAC Supplement (N Acetyl Cysteine) 1,000mg Serving with Reduced Glutathione, 480 Capsules : Health & Household