Methylcobalamin & Adenosylcobalamin. Sublingual. Suitable for Vegetarians. Advanced B-12 Complex combines the two active coenzymated forms of vitamin B-12 - methylcobalamin and adenosylcobalamin (dibencozide) - with 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 body's need to synthesize the active forms of vitamin B-12 from cyanocobalamin.