U can run it thoughout your cycle. 500 IU's every 4th 0r 5th day.
It can keep your balls their normal size if that bothers ya. The theory of running it during is that it keeps your testes ready at all times for production and when PCT - post cycle therapy - rolls around you run your clomid and that your recovery will be quicker.
I did a little more research and found that when steroids were not controlled substances and doctors could actually supervise cycles they prescribed HCG - human chorionic gonadotropin - both during and after cycles.
"HCG - human chorionic gonadotropin - was given during a cycle to counteract the effects of high concentrations of estrogen produced from aromatization of androgens. Once estrogen levels increase, the body shuts down production of lh - leutenizing hormone - which in turn reduces testosterone output. Taking HCG after a cycle serves to boost the body's production of testosterone."