Here is a nightmare story just so you know what ph's and real gear can do to you at a young age. This guy I know started juicing when he first started HS. He used to be the chubby kid in middle school and then over the summer going into his freshman year he became a monster!! Everyone knew it, never said anything (he showed the signs of using) now, he pisses blood, has ED, and loses so much weight and muscle when hes off because he fucked up his natural test production because he started taking shit way too young when it wasn't necessary.
Personally I have taken PH's, they work well for me, but I have been doing my research and talking with vendors when it comes to them, so I know how they are working and why. I am also going on 24, and have been doing all the readings and research for years now. 15 years is way too young, what fucking moron instilled that shit in your head anyways? PH's should be tampered with until at LEAST 21, no younger!!!! And I wouldn't recommend them unless you know what your getting yourself into and do all the research and reading up on the
substance you are about to take. Like mentioned before, at the age of 15 you are a walking fountain of test, eat a shit load of good foods and you won't be disappointed. I have taken on training a younger kid (about 16) at my gym and I train him and told him what to eat and how much, and in 1 month he has already gained 15lbs and is still lean. At this rate this kid is going to be a monster by the time he is 18-19 years old. Don't look for a shortcut, because there really isn't one, sweat and tears is where you are going to make your gains. LIFT HEAVY or GO HOME!!!!!