Methylation biosynthesis and metabolism in the body plays an important role. Methionine is one of the most important in the body of methyl donor, a lot of nitrogenous substances in the biological synthesis of methionine provide S Adenosyl Methionine methyl such as creatine, pine nuts, adrenaline, carnitine, alkali, choline, methyl histamine, a smoke amine etc. Same methylation in...