How it works: In the stomach B-vitamins will release and control gastric juice, help absorb and digest macronutrients, which in turn get more out of the things you eat. Next to that all of them have a host of individual properties. B6 is a good liver-protector, B9 is good for absorbing things in cells, B12 is needed for energy and so on and so on. If we could get all our nutrients from food easily and eat enough, this would no doubt be my Nr2 supplement. If you are a person who can eat big and watch his grocery bill and you have decent genetics, a B-complex and multi-vitamin is all you really need to grow.