491996:

There's also a reason they inject B-12 in hospitals instead of giving it orally. Larger doses hit your bloodstream faster for more immediate results in a system that is nutritionally-deficient. Your energy-drinks are a JOKE compared to injectible vitimin suppliments and the same thing goes for other oral applications [including sublingual] as well.

OP: you may want to pick a recent copy of the PDR while you're at it! It makes a very GOOD starting point for ANY self-medication and will help you avoid any tragic errors in judgement [that even Doctors make frequently].