Vitamin B12 (cyanocobalamin) is necessary for adequate DNA synthesis through its role in folic acid metabolism. Vitamin B12 transforms metabolically inactive 5-methyl-tetrahydrofolate to tetrahydrofolate, which can then be converted to an active coenzyme. Vitamin B12 also acts as a single-carbon transfer agent in certain other metabolic pathways, such as metabolism of propionic acid. Most vitamin […]