N-acetyl Cysteine (NAC) is a derivative of the dietary amino acid l-cysteine. It is a powerful free radical scavenger and thus supports the body’s natural defense system.

NAC provides cysteine the major precursor in the biosynthesis of glutathione (GSH). GSH is the principal defense within the body against reactive oxygen species (ROS) and is also responsible for the detoxification of drugs, metabolites, and other compounds.

NAC also has the ability to chelate heavy metals.