I've been using prolabs creatine monohydrate since september. It helped me gain 30lbs. I gained real fast in the beginning, but towards the end I stop gaining anything. My jar is about to run out and I've been hearing there are different kinds of creatine out there that work better. I want to try something else. I figure it will be expensive, so I'll only buy it once and use it, then once its done go back to the other prolabs creatine jar I havent opened yet.