This product of Swanson (AjiPure N-Acetyl Cysteine) is an antioxidant form of cysteine, usually used for its properties to support the good health of the liver and the brain. N-Acetyl Cysteine, as a powerful antioxidant, is also a precursor to the cellular glutathione, the most important nutrient for longevity. Produced by means of fermentation and with the help of natural raw materials and ingredients of non-animal origin, the amino acids contained in the product are 99-100% pure. Admixtures in other brands could be six times higher! AjiPure amino acids stand for purity, efficacy, and safety. Ajinomoto is a leading supplier of amino acids intended for employment in medicines, so you can be sure you get the best for your health.