from personal experience...
took M1t, and 1 Max Test when i was going through puberty (15-17)... unfortunately i did not know what i was doing and took too much for too long; as a result i have had gyno surgery on each side of my chest at separate times about a year apart.
i'd recommend staying away from it for now, ur body is making so much natty test, no need to suppress it and replace it with anything synthetic (ie. prohormones)
at 16 ur 1 walking ball of testosterone anyways; however i know how a young male's mind works and if ur set on taking it, that nothing anyone says will stop you.
if u do end up taking it, make sure you do it right; correct dosing, correct length, proper pct, and watch for sides and stop immediately. i also recommend weekly checkups with ur physician to make sure ur doing well.
good luck with ur decision, but if i could do it all over, i'd chose to stay away from them un til my late 20's or early 30's once my test levels have pleateaued or just starting to decline