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 Glutathione S transferases and their implications in the lung diseases asthma and chronic obstructive pulmonary disease: Early life susceptibility? ScienceDirect Lung glutathione and oxidative stress: implications in cigarette smoke induced airway disease American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society Glutathione is a potent antioxidant, helps get rid of free radicals and is a detoxifier for the liver lungs kidney and skin One of my favorite nutrients @doctorheathernd @theacchilliwack @theacabbotsford Great Glutathione: The Master Antioxidant Core Med Science Levels of Reduced Glutathione (GSH) in Plasma and Lungs of Control and Download Table