test booster won't hurt teens, won't really help either, it's ph/ds that can mess teens up, trust me, played around with them at age 15, my brother is 6'3, my sister is 5'11, dads 6'2 and mom is 5'9. I'm 36 now and 5'8, was 5'6 at 15, seriously stunted my growth, had ed at 20 years of age too