Iml pct vs serm

Ok so I've been seeing that a lot of people recommend a SERM for PCT. But on the http://www.purity-solutions.net/serm site they dont say how much of it to take or when. Or how much it comes with so I don't know how much to get. Also it says not for human use.... So my other quiestion is how much better is it that the e-control pct that IML offers? I'll be doing a 5 week m-sten cycle and eventhough it says that it doesnt aromatize I'd rather be safe than sorry. I've also been told I should post cycle anyways. Any suggestions? Or more info on the clomid from purity solutions other than just "buy it"