It has a relatively short half-life of 2 days and 4 days. As such, it has a short duration of action and must be administered 2 to 3 x's a week; or, every other day (EOD). As far as clomid, it helps (or is supposed to) help the body produce its own testosterone. Also, being it is relatively cheap. IMO, PCT's are relatively cheap in comparison, so it is always best to have some type on hand. Hope this helps. If I can help you in any other way, please let me know.