@hunt_ak said:
@Stevepep as far as I understood the GHRH analogs (CJC/IPA like you mention) are going to pulse GH, telling your liver to produce IGF-1. An increase in IGF-1 production shouldn't have a correlation to testosterone production.
Am I missing something here? Seems to be two different conversations.
They are bigtime correlated. People who use GHRT often see, on average, a 10% increase in testosterone levels, although some see increases much, much higher. Same goes in reverse - those who use TRT often see an increase in that same 10% or so range in IGF-1 numbers.
This is also true of DHEA replacement - it will often move the needle for both IGF-1 and testosterone. All these hormones seem to work in concert and there is overlapping everywhere.
When things go decline, hormonaly speaking, they tend to drop everywhere. When one hormonal level breaks and degrades it tends to drag others down with it.
The good news is that also works in reverse, when you fix one aspect of the hormonal symphony, others tend to get up to speed and repair themselves, at least to some partial degree.
Let's use GH for example. As GH levels and therefore igf-1 levels decline, we see both Increases in SHBG levels and a decline of LH function in the testes. Both of these in turn also contribute to lower testosterone levels.
Increases in igf-1-->lowers SHBG levels back to normal baseline. It also reinvigorates the leydig cells to work again and respond to LH signaling. Bundle those two together and you see increases in testosterone.
Testosterone is partially responsible for the GHRH pulses in the HTPA. So as your Testosterone levels decline in age, so your GH pulses in the pituitary. Take an exogenous drug like testosterone that amplifies GHRH pulses and you see increases in igf-1/GH levels. We know this from studying puberty - the dramatic shift in increasing igf-1 levels are partially androgen driven, not necessarily from any changes in the HTPA elsewhere.
Testosterone also has a positive effect on GH/igf-1 receptor effectivess throughout the body, not just the liver but also all the tissues as well.