As enzymatic cofactors , B-vitamins are regard in many physiological processes such as the metabolism of glucose , fatty vitriolic and aminic acids , metabolism of tryptophane in the kynurenine tract , homocysteine metamorphosis , deduction and metamorphosis of versatile neurotransmitters and neurohormones admit serotonin , Dopastat , Adrenalin , acetylcholine , GABA , glutamate , D-serine , Glycine , histamine and melatonin