N-Acetyl-L-Cysteine (N-A-C) is an acetylated from of the amino acid cysteine. This form is better absorbed than regular cysteine, making it an ideal form for a supplement. Cysteine a precursor to the antioxidant enzyme, glutathione. Glutathione is one of the most important antioxidants in the body. Note: This product is not intended to diagnose, treat, cure, or prevent any disease, nor should supplements be used as a substitute for a balanced diet. Not intended for pregnant/breastfeeding mothers or children under 18. Do not exceed the recommended dose.