Xymogen Methylcobalamin provides 5 mg (5,000 mcg) of vitamin B12 in each small, pleasant-tasting tablet. Methylcobalamin, the active form of B12 in the body, appears to be better absorbed and stored in tissues than cyanocobalamin. Methylcobalamin plays multiple supporting roles in the body, including red blood cell formation, nervous system health, homocysteine and folate metabolism, melatonin synthesis, and more.