Adenosylmethionine, the main component of adenyl, is a kind of physiological active molecule in all tissues and body fluids of human body. It is a precursor (thio) of methyl donor (trans methyl action) and physiological mercaptocompounds (such as cysteine, taurine, glutathione and coenzyme A) to participate in biochemical reactions in the . In liver, the fluidity of liver cell membrane is regulated by methylating plasma membrane phospholipid. The synthesis of sulfide products can be promoted by sulfur conversion reaction, the amount of alanine aminotransferase, aspartate aminotransferase and bilirubin can be reduced, and the liver function can be protected.