Advanced B-12 Complexª combines the two active, coenzymated forms of vitamin B-12Ñmethylcobalamin and adenosylcobalamin (dibencozide)Ñwith folic acid. Vitamin B-12 is required for normal growth, cell reproduction, myelin and nucleoprotein synthesis, and the formation of red blood cells. Coenzyme supplementation bypasses the bodyÕs need to synthesize the active forms of vitamin B-12 from cyanocobalamin.