Photos: Pond5. Referred to as vitamin B complex, the eight B vitamins — B1, B2, B3, B5, B6, B7, B9, B12 — play an important role in keeping our bodies running like well-oiled machines. These essential nutrients help convert our food into fuel, allowing us to stay energized throughout the day.his B vitamin is a total team player. Cobalamin works with vitamin B9 to produce red blood cells and help iron do its job: create the oxygen carrying protein, hemogloblin. Since vitamin B12 is only found in animal products, studies show higher rates of non-meat eaters with a deficiency.