What exactly does creatine do?

I have heard it speeds up recovery of muscles but is that it. What are some good kinds to buy? I am 17 am I too young to take it? Should I wait for my body to mature? What are some negative outcomes of creatine? What are the benefits? Sorry I have so many questions but I don't know a whole lot about supplements.
 
There are a billion threads just on this forum on creatine alone, let alone a billion more with the google search.

Just buy creatine monohydrate. If you want to know exactly about creatine reacts in the body, then pick up a physiology text and start reading on ATP+PCr
 
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