8 Ways to Boost Glutathione Liposomal Glutathione as a Potential Therapeutic Agent to Control HIV 1 Infection and Tuberculosis European Medical Journal 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 N Acetyl Cysteine supplementation lowers high homocysteine plasma levels and increases Glutathione synthesis in the trans sulfuration pathway Italian Journal of Medicine