I took creatine my senior year of high school. I was always very scrawny my whole life up until that point. I started lifting very hard middle of senior year, I was very motivated to change. I started taking creatine then. Just take what is recommended to take. I took 100% creatine, from prosourceonline.com good stuff. Well from the time I started taking it, until about the end of the summer, I gained roughly 40 lbs. of muscle. BE CAREFUL though, some people's bodies do not like creatine at all, and will let you know. My body was fine with it, but my brother took it, and it wasnt pretty. He had issues in the bathroom, im just gonna leave it at that. Someone I know that took it as well, had extremely bad cramps, alot of stomach cramps. Ive heard of people getting really dehydrated, but everybody is different. DRINK LOTS OF WATER, but then again, you should do that anyway. Hope that helped.