s-adenosyl methionine, sam-e, sam molecule. it is sulfonium betaine, cosubstrate, coenzyme involved in methyl group transfer

adenosine adenosyl atom atomic betaine carbon chemical chemistry coenzyme cosubstrate dietary drawing flat formula group homocysteine hydrogen icon illustration methionine methyl molecular molecule nitrogen nutritional organic osteoarthritis oxygen sadenosyl sam same skeletal structural structure sulfonium sulfur supplement transmethylation