idk about that brand, but i know after you stop taking them your body doesnt immediately know to start production of testosterone again and so you become weak, lose all its' effects. uhhhm, i didnt know you could get testosterone like this without prescription. when it is prescribed its usually to older males 40-50, maybe early 60's, with hormonal imbalances. i know it can be dangerous to put yourself through radical hormone therapy (this is what you are talking about!) and ten fold when you do it while your going through puberty (at 15, you are...) because puberty is, in fact, a radical hormone therapy.
my advice? dont take it.