Jin23
Well-known Member
Now THAT is interesting. I mean HGH is placental GH vs GHRH which releases a pulse of pituitary HGH. I would be keen to learn what the mechanism of blockage is for that.
Nothing truly spectacular going on here really ... Your pituitary GH is shutdown because of exogenous GH use which raises the bodies regulatory GH hormone called somatostatin. GHRH (or it's analogues; sermorelin, mod grf, cjc1295) works by stimulating GH release by binding to GHRH receptors. Somatostatin is an inhibitory hormone which blocks the action of GHRH at this receptor.
A GHRP though, has a different binding site then GHRH and somatostatin and thus bypasses the inhibitory role of somatostatin. And this is why using a GHRP works even if you are on a GH cycle.
The effect of GHRH, GHRP-2 and somatostatin on GH secretion by fetal pituitary - Current Medical Science
Growth hormone releasing peptide (GHRP-2) is a synthetic hexapeptide which specifically stimulates secretion of growth hormone (GH) by fetal pituitary somatotrophs through a new membrane receptor, which is different from growth hormone releasing hormone (GHRH) and somatostatin (SMS) receptors...
link.springer.com