This is a tough one to answer because, technically speaking, there are no clinical studies that suggest that teenagers should stay away from this stuff. But, as a concerning parent, you may be hesitant to give your teenager the go-ahead for this stuff and that is fair. However, with that said, creatine itself is a substance that is proven to be both effective and safe to use. So, there may not be any real harm in allowing your teenager to use this. At the same time, though, it is a muscle enhancer and unless they have a real chance of being an athlete at the collegiate level (and maybe even further), you may not justify them taking it.