Creatine is an amino acid produced naturally in the liver, kidney and pancreas and is used as a way to store energy. Many athletes now use creatine as a dietary supplement to increase muscle mass, strength, and the recovery time of muscles between bursts of activity. It is relatively safe, but like anything else, the QUALITY of the source and the AMOUNT is paramount. Remember, MORE IS NOT BETTER, IT’S JUST MORE!
The best way for your son to “get big” is to lift properly, regularly and heavy, combined with an awesome diet that is quality protein adequate and consumed at the right time.
Hope this helps!