Glutathione, N Acetyl Cysteine Amino Acid Supplements 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 Glutathione Precursor N Acetyl Cysteine Modulates EEG Synchronization in Schizophrenia Patients: A Double Blind, Randomized, Placebo Controlled Trial PLOS One Douglas Laboratories N Acetyl L Cysteine 600 mg Dominican Republic Ubuy