A Free-form amino acid it provides protein synthesis. It is one of the most vital functions taking place in each and every human body. In order for us to utilize our protein intake in an efficient manner, an ample supply of the amino acid glutathione must be present in our cells. NAC (N-Acetyl Cysteine) is essential in the formation of glutathione, as it directly impacts our ability to synthesize the proteins we ingest acts as a precursor to the production of glutathione, helps ward off infections through its antioxidant/detoxification properties and facilitates the production of several digestive enzymes. It has been used widely for detoxificatin heavy metal toxicity.