I've heard of creatine being bad for teens, but i'm not sure why. some information on what it does to teens and the possible negative effects that people speak of would be greatly appreciated.

Maybe. Maybe not.: Such supplements are not studied enough by researchers because these supplements are not FDA-approved drugs for treating particular disorders. Nobody knows for sure what happens if a teen takes performance-enhancing supplements. So, it is best for all athletes to train and build their bodies the natural way, with healthy nutritious foods, avoiding sports supplements or body-building supplements.