Before Let me tell you about my education Im a RN
I graduated from one of the top 20 Nursing school in America. An RN education includes Anatomy and physiology, Pathophysiology which this includes we learned in well detail about the endocrine system. Im writing this to stop the misconception of HCG.

Alot of forums and bobybuilders believe that HCG creates a negative feedback to the male hypothalamic pituitary gonadal axis and this is totally FALSE
HCG mimic LH and in NO WAY SHAPE OR FORM DOES LH CREATE A NEGATIVE FEEDBACK LOOP
Only Testosterone, DHT and Estrogens(Estrodoil and Oestrodoil) have a and inhibiting affect)

As you see in this image LH does not have anything to do with negative feedback loops and estrogens have a strong affect .This is why Nolvadex and clomid work so well and help us during PCT.

And we need AI because once the body see that there enough or alot of Estrogens it creates a negative feedback loop

Therefore thats why Aromasin is a wiser choice but Arimidex can work just as good only down fall is a slight rebound of short time burst of excessive E2(estrodoil)

This study below here backs up everything im typing

http://m.eje-online.org/content/155/4/513.short

This study below explains that HCG preserves our natural test production during and after exogenus Testosterone

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1478834/?page=1

So in conclusion HCG taken with and Ai to control aromatazation and in addition with Clomid and Nolvadex will make a strong PCT to regain our endogenous Testosterone production.
Now if u inject HCG alone with no Ai yes it will create a negative feedback loop because of the aromatization NOT HCG itself!!!

But i must add that we must also think about cortisol control during pct i will make another post about cortisol control during pct ive done it during my pct and i barley shrink. I only loose water weight and maybe an 1/8 inch in bicep circumference.
Anyways until next time
Happy eating Eroiders

UPDATE: Thanx for the added knowledge of Numbhere we had a big debate and I learned that HCG suppress LH instantly http://www.ncbi.nlm.nih.gov/m/pubmed/19170708/
And suppress FSH after chronic use in the study below it took 3month for FSH to be suppreesed by HCG
BOTH FSH and LH are products of GnRH
That being said HCG does not stop GnRH instantly the 1st and most important step of the negative feedback loop. So clomid amd
Nolvadex will counter act this mechanism
http://www.ncbi.nlm.nih.gov/m/pubmed/3084535/

Also the longer we use HCG the more desentistization will occur to the LH receptors affecting the results of your PCT time
Using HCG during cycle which can be 10-15week has its pro and bigger con
Pro preserves testicular function Con Desentistize the LH receptors therefore come PCT time while clomid and nolvadex produces LH the LH will have no effect to the receptors therefore affecting Testostorone production by the testicles
If HCg used during PCT its used for a short period of time 4-5 weeks causing less desensitization and Clomid and Nolvadex will be used counteracting the LH suppression HCG can cause.

So in conclusion use this info and you decide how you wana take your ride either way we are still fucking our system up just one more than the other