HCG plays a very important role in keeping or getting your balls up to size...Small balls do not produce enough natural test to supply your body with it daily needs therefore when your cycle ends and your synthetic test levels drop, you will be fighting for a much longer time to get your balls back up to size if you don't use HCG...the longer you go without getting your natural test level back up, the more gains you lose period...why? because all that cortisol that your body produced during the course of the cycle is just hanging around waiting to attack all those hard gained muscle and the only defendent against that is testosterone!!!! I took my first shot of HCG 7 days ago at 500iu....within the first 5, my sack was hanging lower and I noticed an increase in testicle size...My wife (who knows my balls better than anyone) said that my balls are a little bigger than they were before taking that shot, so HCG works much quicker than clomid and nolva...And my cycle is not even over yet, but I just wanted to start getting them back up to size...