Silymarin is a plant extract extracted from the seed coat of the medicinal plant Silybum marianum, which is a yellow powder or a crystalline powder. 

Soluble in acetone, ethyl acetate, ethanol and methanol, insoluble in chloroform, do not dissolve in water. The main ingredients are silibinin, isosilibinin, silidianin and silicristin and other flavonoids.

The substance has the following effects: protect liver cells from toxic substances, especially alcohol and environmental pollutants (pesticides, heavy metals, etc.) damage the liver; with strong antioxidant function, can protect liver cells from free radical damage, the effectiveness of Far more than vitamin E; promote protein synthesis, to speed up the manufacture of new liver cells, or make damaged liver cells to repair itself. So called "natural liver medicine."