N Acetyl Cysteine (NAC) + Glycine 800mg 60 Caps 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: Utzy Naturals High Dose GlyNAC+ Supplement 2,000mg of Glycine & NAC (N Acetyl cysteine) with Vitamin B2 Cofactor for Glutathione Production 90 Capsules : Health & Household Should You Pick NAC or Glutathione? The Truth Inside NAC Capsules Optimal Regeneration Support Combination ESN 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