You are not through puberty..... 15 is way tooo early.
You are way to uneducated to be taking those supplements, as I have done research on them (I am 16 for the record). You do know that excess tesostorone gets converted to estrogen right?
right on - if the body all of a sudden gets this surge of testosterone for a given cycle (a la steroid injections), sure you'll have extra testosterone, will be able to lift unheard of weights, but your body isn't producing the T naturally (and getting a heck of a lot more than it's used to), so it'll get confused and convert the excess T to estrogen, via aromatization, leading to, among other things, even worse "puffiness" and gyno...
you can definitely increase T levels naturally (of course nowhere near to the same extent as you would by doing steroids) by building muscle, losing fat (which is a key culprit in increasting estrogen levels, i believe)...
so, with regard to kindherb's question, yeah you can alter the balance of T to E in your body by altering your body's composition naturally. the only problem is that it takes time, dedication, watching what you eat, doing enough cardio and building muscle, etc. in other words, it's a long term commitment.
as a side note, di-indole methane (which can be found in cruciferous vegetables like broccoli) is known to be a "natural" estrogen metabolizer ("natural" meaning not a prescription based drug, like tamoxifen), which could lower E2 levels, relative to testosterone.
DIM supplements are sold at vitamin shoppes and health stores (usually in the women's health sections), and might help, although it's a long term type thing, and any short term effects are marginal, at best.
also, nitrix - at 15, your T levels are still increasing, regardless of whether or not your voice is still cracking or if you've already got body hair and hair on your balls - in fact, your T levels will continue to increase through to your 20s, and if you start messing with your natural T now, you might regret it later.
if anything, capitalize on your youth, on the fact that your T is on the upward trajectory, and workout, build more muscle & decrease fat, which will boost T, which in turn will help you build muscle, thus boosting T, and so on, so forth.
if by your early 20s, still no growth or major changes, then look into alternative options.
you're only 15 - your body hasn't even reached its developmental peak yet. you've got five more years to stick it out. in the grand scheme of things, that's nothing. and more than likely, you'll see changes happen naturally over those 5 years.