NAC Dr. Randolph's Wellness Store GLUTATHIONE INJECTION GLUTA KOJIC WHITE ILLUMINATEUR WHITENING MILK (400ML) Blessed Prinx Cosmetics NAC (N Acetyl Cysteine) Antioxidant Support for Glutathione Production 600 MG (120 Capsules) by Megafood at the Vitamin Shoppe Extreme Glutathione Injection Lotion And Soap 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