N Acetyl Cysteine supplementation lowers high homocysteine plasma levels and increases Glutathione synthesis in the trans sulfuration pathway Italian Journal of Medicine 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 Supplement N Acetyl Cysteine 600mg per Serving Vegan High Absorption Non Smelly NAC Capsules Glutathione for Liver Support plus Lung Health and Exploring N Acetylcysteine in Psychiatry Psychiatric Times