Here is some decent info for you. I've tried 500iu's E5D while on cycle with good results:
Human Chorionic Gonadotropin (HCG) in short help male athletes produce there own testosterone while on cycle, and recover more quickly after a cycle (For a full description go to Steroid profiles) It is a MUST USE DRUG IMO for ANY cycle short or long.
Ive done many cycles that did not include HCG in my early days, hell I didn't even know what PCT was. This was WAY before the Internet so all my info was from freinds and the few books that were around.
I've done cycles that ended with just using HCG the 2wks after my last testE shot and saw results from that(1,000ius 2xwk/ 2wks). IMO never go over 2,000ius per week.
But about 3yrs ago I started using small amounts of HCG throughout the cycle with much better results. The theory behind this is to give constant stimulation throughout the cycle and not let your own test production stop, or at least minimize it. Ive also noticed my sex drive stayed constant while on HCG even when using Tren or Npp/Deca and doing very long cycles. This is without a doubt the best way to run it and IMO leads to better overall gains, reason is not only are you using artificial Test/AAS but you are still producing your own, to me this makes since.
There are 3 ways to use this method. note: always use the LEAST amount that you can get results from.
1) 100ius ED starting after wk1 and continued through cycle and for 4-18days after last AAS shot depending on the ester length (prop 3days - testE 14days - test Cyp 18days sust250 21days). Always make the last HCG shot on day ester clears.
2) 250-300ius EOD and (same as above)
3) 500ius E5D starting after wk1 and (same as above)
Ive done all and really can't say one is better, with #2-3 you won't go through as many needles but all have worked well for me.