Silymarin is a kind of favonolignan compound, it is extracted from the seed capsule of composite plant Silybum marianum, yellow powder, bitter in taste. The main ingredients are: Silybin, Isosilybin, Silydianin,Silychristin, etc. It has the efficacy of liver protecting, improve the function of liver, promote biliation and diminish liver inflammation. As a kind of better antioxidant, it can clearing free radical in human body, postpone senility. Silymarin can protect the liver from damage of alcohol, chemical toxicant, drug, food poison, environmental pollution; accelerate liver cell regenerating and repairing. So it is called "The natural liver-protection drug". In addition, Silymarin has the function of radiation hardening, arteriosclerosis preventing, skin-aging delaying. It is widely used in drug, health products, food and cosmetics.