AndroGel is pure testosterone suspended in a gel that is applied to the abdomen and/or upper arms. Never to the penis because it could be transferred to the scrotum (and therefore the testicles), or transferred to your sexual partner, female or male, which is a really bad thing to do. It will also cause any residual natural production of the hormone to be stopped by your body.
I have had hypogonadism for over a decade and, as a consequence, have had to get replacement therapy. I’ve used injectables and gel, as well as oxandrin to bring and keep my testosterone level into the required high-normal range, between 500 and 1000. I have no choice, and who ever likes having no choice? If I were to stop I would be at risk of loss of muscle mass, wasting syndrome, and worse depression than I already suffer.
Boys, please don’t mess with this if your testosterone level is normal. If you suspect you have hormone deficiency problems get tested by a reliable doctor. This is not a toy. It is not a recreational drug. I can speak from experience that my testicles have shrunk a bit and my cock is the same as it always was.
I have lifted weights for 30 years and notice no difference between pre- and post- testosterone replacement.