NAC vs Glutathione: Differences, Similarities And Health Benefits 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 (N Acetyl L Cysteine) Glutathione Precursor Molecular Provisions NAC vs. Glutathione and How They Work Invigor Medical NAC and Glycine: The Efficient Way to Raise Glutathione