Twinlab NAC N-Acetyl Cysteine Description:

Free Form Amino Acid
Gluten Free Amino acids are the building blocks of proteins. N-acetyl-cysteine (NAC) is a sulphur-containing free form amino acid, and comes from the amino acid L-cysteine. N-acetyl-cysteine, which is more stable then L-cysteine, is important for production of the free radical fighter, glutathione. NAC, an antioxidant, is used by the liver and lymphocytes to help detoxify the body. NAC also helps boost protective enzymes in the body. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease.
Ingredients: Pure N-acetyl-cysteine 600mg.