I currently take multivitamins, green tea extract, fish oil, BCAAs, and some other supplements. I've had Creatine recommended to me in the past, but I always see mixed reviews. Some places/people say it is one of the few tested and proven supplements, while other places state that the long-term adverse effects are still not apparent enough to gauge, and while they aren't suspected to be severe, ruling them out would be wrong.
So, what do you think about it? Do you use it? Does it work?