How does taking a complex B vitamin before drinking help?

Mixing all of that different crap upset your stomach. As far as the vitamin b goes. Alcohol drains your system of b vitamins. So if you drink a lot like 2 or more days per week you should take a super b complex at least once a day. If you only drink socially like a couple of times a month or just a couple beers over the weekend your fine with out it.