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 Nebulized Glutathione for Support of the Common Cold and other Lung and Respiratory Conditions Naturopathic Living Medical Solutions NRF2 supports non small cell lung cancer growth independently of CBP p300 enhanced glutathione synthesis EMBO Reports Springer Nature Link Oxidative Stress and Inflammation in Acute and Chronic Lung Injuries Levels of Reduced Glutathione (GSH) in Plasma and Lungs of Control and Download Table Frontiers Inhibiting lung lining fluid glutathione metabolism with GGsTop as a novel treatment for asthma