Which "part" of the HPTA is the hardest to "turn on" during PCT?

I am getting off testosterone after two years (if you want back story, you can read my previous posts, and I'm unable to perform any conventional PCT as I cannot tolerate SERMs.

I have, however, been entertaining the idea of using GnRH or hCG as a way to "prime" the body before coming off TRT cold turkey, such that the natural restart is accelerated somewhat.

The main question:Which part of the HPTA takes the longest to "come online," so to speak, during a PCT?

+

Would using hCG to "prime" the testicles after long-term TRT help speed up HPTA recovery much, if at all?


For example, if it's the pituitary or both pituitary and leydig cells, I would likely use GnRH after ceasing testosterone while letting the ester taper out of my body. However, if it is primarily the leydig cells that become desensitized and the GnRH and LH signaling ramps up fairly quickly, then I would opt to prime my body with hCG only.

I would plan this based on the following logic:

GnRH - This should stimulate the pituitary to release LH, and by extension, should also start stimulating the desensitized leydig cells. The caveat is that this would likely only work if the exogenous hormone suppression is low enough. I would theoretically initiate treatment after discontinuing test and using it while my body begins to clear the long ester (~2 weeks of time)

hCG - This would act as something of a synthetic LH, only stimulating the testicles but not the pituitary or hypothalamus. The benefit of hCG is you can stimulate leydig cells directly, regardless of suppression at hypothalamus and pituitary levels.

Any input and/or links to studies appreciated. @madman @readalot
 
I am getting off testosterone after two years (if you want back story, you can read my previous posts, and I'm unable to perform any conventional PCT as I cannot tolerate SERMs.

I have, however, been entertaining the idea of using GnRH or hCG as a way to "prime" the body before coming off TRT cold turkey, such that the natural restart is accelerated somewhat.

The main question:Which part of the HPTA takes the longest to "come online," so to speak, during a PCT?

+

Would using hCG to "prime" the testicles after long-term TRT help speed up HPTA recovery much, if at all?


For example, if it's the pituitary or both pituitary and leydig cells, I would likely use GnRH after ceasing testosterone while letting the ester taper out of my body. However, if it is primarily the leydig cells that become desensitized and the GnRH and LH signaling ramps up fairly quickly, then I would opt to prime my body with hCG only.

I would plan this based on the following logic:

GnRH - This should stimulate the pituitary to release LH, and by extension, should also start stimulating the desensitized leydig cells. The caveat is that this would likely only work if the exogenous hormone suppression is low enough. I would theoretically initiate treatment after discontinuing test and using it while my body begins to clear the long ester (~2 weeks of time)

hCG - This would act as something of a synthetic LH, only stimulating the testicles but not the pituitary or hypothalamus. The benefit of hCG is you can stimulate leydig cells directly, regardless of suppression at hypothalamus and pituitary levels.

Any input and/or links to studies appreciated. @madman @readalot

post #5
 
My experience and all the other flavors in this thread:




If you object to SERM you could run an AI if you don't like my hCG then wait protocol. Sometimes less is more.



 
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For anyone else curious:

Madman states:

"Even without the use of a PCT, the natural production of LH will kick in fairly quickly but natural endogenous production of testosterone can take much longer as the critical aspect of the recovery process is the responsiveness of the Leydig cells in the testes to the LH."

Also, thank you @readalot for the additional... evidence... that using hCG alone as a priming tool could be sufficient.
 

hCG Mixing Calculator

HCG Mixing Protocol Calculator

TRT Hormone Predictor Widget

TRT Hormone Predictor

Predict estradiol, DHT, and free testosterone levels based on total testosterone

⚠️ Medical Disclaimer

This tool provides predictions based on statistical models and should NOT replace professional medical advice. Always consult with your healthcare provider before making any changes to your TRT protocol.

ℹ️ Input Parameters

Normal range: 300-1000 ng/dL

Predicted Hormone Levels

Enter your total testosterone value to see predictions

Results will appear here after calculation

Understanding Your Hormones

Estradiol (E2)

A form of estrogen produced from testosterone. Important for bone health, mood, and libido. Too high can cause side effects; too low can affect well-being.

DHT

Dihydrotestosterone is a potent androgen derived from testosterone. Affects hair growth, prostate health, and masculinization effects.

Free Testosterone

The biologically active form of testosterone not bound to proteins. Directly available for cellular uptake and biological effects.

Scientific Reference

Lakshman KM, Kaplan B, Travison TG, Basaria S, Knapp PE, Singh AB, LaValley MP, Mazer NA, Bhasin S. The effects of injected testosterone dose and age on the conversion of testosterone to estradiol and dihydrotestosterone in young and older men. J Clin Endocrinol Metab. 2010 Aug;95(8):3955-64.

DOI: 10.1210/jc.2010-0102 | PMID: 20534765 | PMCID: PMC2913038

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