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 Amazon.com: Advanced Complex NAC Supplement (N Acetyl L Cysteine) 600mg with L Glutathione 500mg and Milk Thistle Extract Potent Antioxidant Immune Function Support Respiratory Health Promotes Liver Kidney Detox : Health & Household Glutathione vs. NAC: Which Antioxidant Is Best for Your Liver? Life Extension The Combined Antioxidant Effects of N Acetylcysteine, Vitamin D3, and Glutathione from the IntestinalNeuronal In Vitro Model