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 NAC Supplement N Acetyl Cysteine 600mg per Serving Vegan High Absorption Non Smelly NAC Capsules Glutathione for Liver Support plus Lung Health and Glutathione and NAC Reduce the Severity of COVID 19 Top 9 Benefits of NAC (N Acetyl Cysteine) Nature's Blend Nac Essential Glutathione Power Body Antioxidant, 100ct