GHRP-6

The overview

What is GHRP-6?

GHRP-6 is the prototypical synthetic growth-hormone-releasing hexapeptide, studied as an agonist of the growth-hormone-secretagogue receptor 1a (GHS-R1a) through a mechanism entirely distinct from growth-hormone-releasing hormone. Receptor activation drives membrane phosphatidylinositol turnover, generating second messengers that activate protein kinase C and mobilize intracellular calcium stores in pituitary somatotroph models, dose-dependently releasing growth hormone both in vitro and in vivo. The two D-amino acids (D-Trp and D-Phe) confer resistance to enzymatic degradation. GHRP-6 also displays ghrelin-receptor-mediated effects on appetite-signaling pathways in research models. As the historical reference GHRP, it anchors comparative secretagogue studies. Description is strictly mechanistic and in-vitro; no human dosing or therapeutic claim is made.

In the research

Where GHRP-6 shows up

The areas researchers focus on with GHRP-6 - and why it has the science community paying attention.

• GHS-R1a agonist signaling (PI turnover, PKC, Ca2+)
• Reference compound for comparative GHRP studies
• Ghrelin-receptor appetite-signaling models

By the numbers

The facts that matter

To the molecule

Molecular specifications

Sourced, not claimed

The science behind it

The peer-reviewed studies behind GHRP-6, linked so you can read them yourself.

1. Bowers, C. Y., Momany, F. A., Reynolds, G. A., Hong, A. (1984). On the in vitro and in vivo activity of a new synthetic hexapeptide that acts on the pituitary to specifically release growth hormone. Endocrinology.

   “The hexapeptide specifically and dose-dependently releases growth hormone both in vitro and in vivo by a mechanism distinct from GHRH.”

   DOI ↗PubMed ↗

Straight answers

Questions, answered