I know this is your friend etc but the guy's an idiot. Try and get some sense into him. 15 years old for f**ks sake!
Print out this info on the stuff. Get him to look carefully at the side effect s info. This stuff can do real damage if not used properly on people over 21, nevermind growing children. THIS SHOULD NOT BE USED ON 15 YEAR OLDS.
http://www.discussbodybuilding.com/d...pheraplex1.pdf