8 Ways to Boost Glutathione 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 l cysteine averts ferroptosis by fostering glutathione peroxidase 4 ScienceDirect 6 health benefits of glutathione N Acetyl Cysteine supplementation lowers high homocysteine plasma levels and increases Glutathione synthesis in the trans sulfuration pathway Italian Journal of Medicine Glutathione Skin Care Ingredients: How Its Works