Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation 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 JCI Insight Attenuation of lung fibrosis in mice with a clinically relevant inhibitor of glutathione S transferase A role for CFTR in the elevation of glutathione levels in the lung by oral glutathione administration American Journal of Physiology Lung Cellular and Molecular Physiology American Physiological Society LCS3 is a Glutathione Disulfide Reductase (GSR) and TXNRD1 Inhibitor Network of Cancer Research Glutathione responsive biodegradable polyurethane nanoparticles for lung cancer treatment ScienceDirect