HealthWise® NAC (N-Acetyl-L-Cysteine) is 100% pure pharmaceutical grade amino acid powder, derived from the amino acid L-Cysteine. This 'acetylated' form is more soluble and more stable than L-cysteine which plays an important role in the production if the free radical fighter, glutathione. NAC is a valuable amino acid antioxidant supplement - most commonly known for detoxification of the liver and the efficient breakdown of mucus. Did you know? 1g of vitamin C powder to 2g of NAC will enhance the conversion of NAC to glutathione and prevent oxidation.