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"Vitamins B6 and B12 don’t absorb well when taken orally, so the amounts placed in most energy drinks will likely have little to no effect." http://www.energyfiend.com/energy-drink-ingredients

B Vitamins
These are essentially the things that help you convert food to energy, like sugar which is found in abundance in energy drinks. The jury’s still out on whether or not they increase energy levels via supplementation. Search the interweb for info on proper dosing of the different vitamins. Common names for B vitamins are niacin, riboflavin, cyanocobalamin, and pyridoxine hydrochloride. Vitamins B6 and B12 don’t absorb well when taken orally, so the amounts placed in most energy drinks will likely have little to no effect.

A complete list of B vitamin side effects is found here.
http://www.energyfiend.com/energy-drink-side-effects#3