i had some friends back in college that thought taking niacin was the way to go. don't know if it actually works or not.

http://www.totse.com/en/drugs/legal_...ug_use/dt.html
http://www.drugstore.com/qxp150145_3...an_tablets.htm

not sure about the dosing, don't think i like the side effects. well, good luck, try not to stress out too much about it as i think the worst thing that will happen is you won't get the job if you fail.
gl