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 Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation Struggling with congestion, a chest cold, or just want to give your lungs (and skin!) a boost? Nebulized Glutathione delivers powerful support straight to your lungshelping you breathe easier, Nebulization of glutathione and N Acetylcysteine as an adjuvant therapy for COVID 19 onset ScienceDirect Glutathione The Ultimate Antioxidant Purifi IV Disturbances of the Lung Glutathione System in Adult Guinea Pigs Following Neonatal Vitamin C or Cysteine Deficiency