If you are into fitness and do not know what creatine is, step up your game. Being one of the most researched supplements out there, it is proven to be effective. ON creatine gave me a boost in size, strength, and endurance. Made with high quality creapure creatine you do not have to worry about stressing a kidney with cheap materials or impurities. If there is one supplement in the world i could keep in addition to whey protein, it would be Optimum Nutrition creatine. I bought the 2000 gram tub so i don't have to worry about creatine for a while.