The Central Nervous System Modulatory Activities of N Acetylcysteine: A Synthesis of Two Decades of Evidence Healthy Origins NAC (N Acetyl Cysteine) Healthy Origins 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 Exploring the Evidence of N Acetyl Cysteine (NAC) for Mood Disorders Psychopharmacology Institute