N-acetylcysteine (NAC) is a sulfur-containing amino acid and is a precursor to glutathione. NAC is a powerful building block for supporting our bodies deference.  NAC is an antioxidant that promotes healthy immune response and helps support the body from toxic insults and oxidative stress. Selenium, L-lysine, molybdenum, zinc, and copper are also included for its synergistic influences especially when used with NAC long-term.