N Acetyl Cysteine (NAC) + Glycine 800mg 60 Caps Understanding N Acetyl Cysteine (NAC): A Versatile Natural Aid for Hea myBrainCo Should You Pick NAC or Glutathione? The Truth Inside NAcetylcysteine (NAC) is More Than Just an Antidote. NAC replenishes glutathione (GSH), breaks mucus disulfide bonds, and modulates glutamate. That's why it works in the liver, lungs, and brain. Owais As I mention in my book, N acetyl cysteine (NAC) is not found in food sources, but in the body, it converts into cysteine. NAC acts as a precursor to glutathione, a powerful