EAS phosphagen, not flavored, is a good one... plain creatine monohydrate.. 1400g for 27 bucks.... Also this site, MQ, sells a good creatine supp called volumex...
YUM
19-nor, 4-ad, 1-ad, anything that advertises itself as a pro-hormone, steroid or steroid-like.
The reason:
As you enter your mid-late teens your body uses its natural hormones to finish off your growth. Taking hormones at this stage in your growth cycle can negatively affect this process with life-long consequences.
The good news is you have a ton of natural hormones in your system. You have the natural ability to put on muscle much faster than you will be able to when you are 25.
first off how long have you been lifting? I think the best supp that you can take is creatine. use EAS Phosphagen HP its some good shit! Its the best creatine i think because it has Carbs, if i'm not mistaken the simple carbs (sugar) in phosphagen HP will increase creatine absorbtion. Also its easy because you dont need to mix it with anything just put water in and out you get fruit punch of watever.
Ofcorse u gota eat a fucking shit load of protein. Its hard, but get a bulk container. if you can buy online do so, its hella cheaper. If you can't then i guess u gota find a GNC (gasp)
Zinc. Any will do, but I don't think you can beat ZMA.
Especially during puberty it will increase testosterone and penis size. (The latter though only during puberty of course. If you care to read the details do a search on PubMed.)