NutraBio N Acetyl Cysteine NAC 600 mg 90 Veggie Capsules Vitacost View of N acetylcysteine: an old drug with variable Anti influenza properties Journal of Controversies in Biomedical Research N Acetyl L Cysteine, NAC Easily absorbed Life Extension Europe NAC Amino Acid 600 mg Natural Factors Canada Pure Encapsulations NAC 600 mg 90 Capsules Vitacost 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