I never workout without supplements My favorites:
http://www.boomersmma.com/bsn-no-xplode.html
http://www.boomersmma.com/cns-caffeine-pills.html
http://www.boomersmma.com/xyience-noxcg.html
But PLEASE don't take anything for the first time before a fight. You've got to get used to it and take it before training sessions. It will really screw you up if you take it for the first time before a fight.