Free Radical ProtectionMaintains Cellular HealthNon-GMODietary SupplementKosherAmino AcidsFamily Owned Since 1968GMP Quality AssuredHalalN-acetyl cysteine (NAC) is a stable form of the non-essential amino acid cysteine. It is a sulfur-containing amino acid that acts as a stabilizer for the formation of protein structures, and is also necessary for the formation of glutathione. Selenium is an essential trace mineral that facilitates the production of several important enzymes.