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 Physiology and pathophysiology of mucus and mucolytic use in critically ill patients Critical Care Springer Nature Link Nasal mucus glutathione transferase activity and impact on olfactory perception and neonatal behavior Scientific Reports What food contains hyaluronic acid? SSUNSU Copaifera malmei Harms leaves infusion attenuates TNBS ulcerative colitis through modulation of cytokines, oxidative stress and mucus in experimental rats ScienceDirect