st8grad said:You won't gain 15 pounds of muscle on a single cycle that is.
Correct. Maybe 5-6 pounds will be muscle, 3-4 of which will most likely be lost a month later.
Hell, at 19, if you trained right and used the RIGHT supplements (not that GNC Muscltech garbage) you can put on 10 pounds of muscle by the end of the year.
And yes, your HPTA is still developing, so sexual sides can be permanently damaging.