Maybe I'm way off but I have read multiple times that running a SERM and an AI in PCT is counter productive. From my understanding the SERM is used to allow your E to stay high but selectively bind to receptors to avoid things like Gyno etc from surfacing. This higher E in your body is an indicator for your body to compensate by kick starting your Test production to counter the high E and achieve its natural "equalibrium".
If you run an AI to crush your E levels then your SERM is near useless and your body is slower to kick start T production in response to higher E levels becuase your E levels are bottomed out.
This is a very lamens way of writing the actual process, but I hope it makes sense.
If I have been mis informed I am happy to be corrected :feedback:
Not accurate. To each their own, however, I am a believer that both a SERM and AI should be used for PCT.
As your un-natural test drops, and you start making nati test again, you still have a high level of estro from the higher level of test you had in your system. To keep that estro lower you run a low dose AI and to keep the nipples safe and to kickstart you nati test production you run your SERM. you taper both your AI and SERM so the body can start to reach homeostasis on it's own.
If you argue why run a SERM if your running an AI or vice versa. It's really simple, if you are running an AI you are doing it to help control estrogen not crush it. So you still have estrogen. Depending on the AI you may not be running a suicide inhibitor and it still allows for the conversoin to estro. When you are in PCT, unless you have a estrogen side, such as gyno, you should not crush your estro to nothing. You should run a LOW DOSE AI, which allows for estrogen to be present in the body. The SERM ran with the AI will keep the Estro from causing gyno and kickstart the testosterone production.
If you only run a SERM, and no AI you can have other estro sides if the test in your body is high, and if you are coming off an aromatising compound it can aromatise. If that compound can aromatise and you have way to much estro. Or if you ar not running a aromatising comound the test that your body is producing from the SERM and Test boosters can be higher then nati test and aromatise.
Here is an example: My nati Test 343
My test when on Nolva and DAA 783
That is my .02. Take it how you want it, I could care less how anny one does their PCT, because it does not affect me in any way. There is more science I tried to make sure it was understanable to any reader.