S-ADENOSYL-L-METHIONINE is a methyl donor and a cofactor of enzyme-catalyzed methylation reaction. It is mainly involved in the auxiliary process of methylation reaction such as catechol O-methyltransferase (COMT) and DNA methyltransferase (DNMT). S-adenylmethionine is present in all cells and is mostly methylated in the liver and also regulates responses to liver function, growth and injury.

CAS NO.: 17176-17-9

Alias：SAM-E；AdoMet；S-adenosyl methionione；

Molecular formula:  C₁₅H₂₂N₆O₅S

Appearance: White to off-white powder or solid .