Hydroxycut IMHO is a huge waste of money. It only worked when it contained Ephedra- now the stuff is off the market, and Hydroxycut's utility is dubious at best.
Steer clear of weight loss supplements, especially when they contain a lot of caffeine- you will lose water weight and that's not good, sicne your body needs water to metabolize fat.
Caffeine is an effective appetite supressant, but that morning coffee should do the trick, lol, and it's cheaper (well, not at Starschmuck's).