The Effect of Glycine and N Acetylcysteine on Oxidative Stress in the Spinal Cord and Skeletal Muscle After Spinal Cord Injury Inflammation Springer Nature Link 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 Amazon.com: GlyNAC ET NAC Supplement N Acetyl Cysteine Ethyl Ester 20x More Bioavailable Glycine & N Acetylcysteine Ethyl Ester Anti Aging Supplement, Boost Glutathione, 60 Capsules Nutri 3rd Party Tested : Glycine and Nacetylcysteine (GlyNAC) supplementation in older adults improves glutathione deficiency, oxidative stress, mitochondrial dysfunction, inflammation, insulin resistance, endothelial dysfunction, genotoxicity, muscle strength, and cognition