N Acetylcysteine Medical Countermeasures Database CHEMM 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 NAC vs. Glutathione and How They Work Invigor Medical Adjunctive N Acetylcysteine and Lung Function in Pulmonary Tuberculosis NEJM Evidence Oral N acetylcysteine ameliorates liver fibrosis and enhances regenerative responses in Mdr2 knockout mice Scientific Reports