Vitamin B12 is a vitamin that cannot be produced in the human body but can be consumed daily because it is used up daily through hydration. This vitamin is specifically important for body builders because Vitamin B12 can help increase the metabolism of fats for energy and thus result in fat loss. B12 is also helpful for the central nervous system and thus it is a beneficial for everybody to consume. In addition to the generic uses of vitamin B12, users of this vitamin have also noticed an increased appetite thus allowing them to eat bigger meals and benefit their bulking process.