I have seen web sites that sell them, but am not sure if it is a prescribed drug or not. Prescription only, check with an endocrinologist. I'd call them first and see what the doctor's philosophy is. They will only work if your growth plates are open. These close in men by 25 and women by 16-18 depending on onset of menses.
Ephedrine is a hormone made by the adrenal and is used medically to raise blood pressures etc.
There would be few uses in a gym except to enhance performance, this drug raises heart rate, blood pressure, etc for a short time. It will enhance performance,but, potentially stress your heart while it is in your system. Very short acting. No, systemic estrogen can. I have used the patches for over a year, and am tired of the adhesive rings which they leave once you remove the patches.