I have noticed that efedrine tends to make mine shrivel up like an old man, but the actual juice itself doesn't shink it. I have taken yellow jackets before and wondered where my dick went. If it does shrink, it is only noticed when you are unerect. As soon as you get blood flow down there it will go to full capacity. No complaints from my old lady. I have noticed that steroid use cane cause your nut sack to tighten up. I have used clomid mid-cycle to counteract this problem. You gotta let your nutz hang!