NAC (N Acetyl L Cysteine) Glutathione Precursor Molecular Provisions 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 NAC vs Glutathione: Differences, Similarities And Health Benefits 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