Breathe Better, Detox Deeper: The Power of Glutathione + NAC Nebulizer Calibrate Hydration NAC is a great supplement. It's awesome stuff to support healthy lungs. NAC is a known mucolytic. That is a fancy term meaning breaking up mucus. Now, research does show that NAC 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, NAC & Vitamin C 30 Veg caps N A C GLUTATHIONE PRECURSOR 500MG