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 and DAO I spoke with someone yesterday who believes that Acetylcysteine suppresses the production of diamine oxidase. Carol Savage (could someone pl tag her for me?) Do you know Glutathione biosynthetic scheme. N acetyl L cysteine (NAC) can supply Download Scientific Diagram Allergy Research Group NAC N Acetyl L Cysteine Immunocal Glutathione Precursor Whey Protein Isolate, Immune Support Sante Medi