NOW&ampreg; Liver Detoxifier &ampamp; Regenerator is a proprietary blend of herbs and nutrients designed to support healthy liver function. This product contains Milk Thistle Extract, which has been shown in clinical and non-clinical studies to support the liver, as measured by standard liver enzyme laboratory tests. In addition, this formula contains N-Acetyl Cysteine and Methionine, two amino acids known to enhance the production of glutathione in the liver. Glutathione, a major cellular antioxidant plays an essential role in liver detoxification mechanisms. Also included are other herbs (Schisandra, Bupleurum, and Scute) that have been shown in non-clinical studies to support healthy liver function.*