Milk Thistle P. E. 1. Descriptions and Specifications of Product Content Specifications: 80% Total Silymarin by UV and 30% silymarin I byHPLC Silymarin is the key constituent in Milk Thistle Seed. Silymarin is a flavonoid composed of 4 isomers: Silybinin, silychristin, silydianin, isosilybinin. Silymarin is only soluble in Alcohol and not water, Silymarin Molecular Formula: C25H22O10 Molecular Mass: 482.436 CAS NO: 22888-70-6 2. Sources and Habitat Silybum marianum (L. ) Gaertner (syn. Carduus marianus L. ) belongs to the Asteraceae family (Compositae). It is native to southern Europe, southern Russia, Asia Minor and North Africa. It has been naturalized to North and South America. 3. Indications and Uses It has the functions of protecting liver cell membrane and improving the liver function. Meanwhile, it has the function of detoxification, reducing the blood fat, benefiting the gallbladder, protecting the brain and removing the free radical of body and active constituent.