Essential B Vitamins, including Vitamin B12, aid in cell growth & development, and breakdown of carbohydrates, fats, and alcohol. These B Vitamins are the building blocks for a healthy neurologic and cardio-vascular system, which is why vitamin B is so popular among athletes. One of the primary reasons B12 injections have gone mainstream is due to the natural "pick me up" it provides. Vitamin B12 acts as an energizer while boosting your metabolism and releasing anti-stress elements throughout the body.