Supplements and "Performance Enhancers" are just compliments to good training cycles.
If you don't know how to train, they won't help you. Creatine doesn't put pounds on your bench press and lift the weight for you, sure it helps but it is the hard work,serious training and consistency that will make you stronger. So before you spend empty out your wallet at GNC, invest in some good strength training books, like starting strength. For bodybuilders, Arnold's Bodybuilding encyclopedia is a must have.