The most highly rated B-12 vitamins are of the methylcobalmin variety, according to One Green Planet. This information is listed on the nutrition panel on the back of the bottle or container. Other types of B-12 supplements on the market include cyanocobalamin and the less common hydroxycobalamin.
Vitamin B-12, also known as cobalamin, is a nutrient that helps the body produce energy as it works to covert food into glucose. It is also important in the production of DNA elements, red blood cells, bone marrow, the gastrointestinal lining, the respiratory tract lining and nervous system health. It is also essential to the prevention of megaloblastic anemia, says Healthline.