ATD shuts down your estrogen. It's not gonna shink your nuts. In order to for that to happen, you would have to be taking something that behaves like test in order to start the negative-feedback loop. The neg-feedback loop is where your body stops making it's own test because it is getting more than enough from outside. You nuts shrink in such a circumstance because they stop producing test, and consequently stop producing sperm as well. Thus, smaller balls.
In a nutshell, you're balls will be fine. It's just really really potent stuff, especially taken transdermally. If you take too much, you'll totally screw up your hormonal balance. Having zero estrogen in you will only get you
jacked into a hospital bed.
Cheaper alternative to
6-oxo, but you just gotta be careful not to take too much.