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 The efficacy of N acetylcysteine in improving liver function: A systematic review and meta analysis of controlled clinical trials ScienceDirect Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification Apparently Korean glutathione is amazing for skin brightening, fading dark spots and hyperpigmentation? I found the serum and toner pads by searching numbuzin on Amazon. Update: apparently