I received my info from an ex IFBB pro and he has assured me 1500-3000IU's every 5 days is the best bet, pro's go anywhere from 2000-5000IU's. This has also been confirmed to me by a professional trainer in my area who has trained numerous clients who turned IFBB pro. I'm not sure of Swale's credentials so don't take it the wrong way, but a lot of people on the internet really don't know what they're talking about.
I actually know quite a few IFBB pros in my area.... Them, and the trainers, do not really know what they're talking about.... They are the LAST people I would go to for information regarding my endocrine system.
What do you think these boards are for Gary? I agree that you shouldn't believe everything you read.. but that also goes for everything you hear.. especially from IFBB pros.. Just because they got a pro card means they know what they're doing? A lot of those guys do what they're TOLD.
And yes, 500iu's a week works very well in my experience... That's my point.. a low dose works well, so why do short bursts of higher doses? Like I stated, 1500-3000iu's have a higher chance of lowering your Leydig's sensitivity to LH... not matter the duration. I don't take the chance.