What Is GHRP-6? Growth Hormone Releasing Peptide Guide
GHRP-6 is a synthetic hexapeptide and one of the earliest growth hormone releasing peptides studied. It acts as an agonist at the ghrelin receptor (GHS-R1a) and is frequently contrasted with Ipamorelin and GHRP-2 in research literature because of its pronounced effect on appetite signalling.
Structure and class
GHRP-6 has the sequence His-D-Trp-Ala-Trp-D-Phe-Lys-NH2 and a molecular weight of approximately 873 g/mol. It belongs to the first generation of GHRPs developed to stimulate growth hormone release through the ghrelin receptor.
Unlike GHRH analogues such as CJC-1295, GHRPs act on a different receptor and are often studied alongside GHRH analogues to examine combined signalling.
Research profile
GHRP-6 is best known in the literature for its strong appetite-stimulating effect, mediated through ghrelin signalling. This makes it a common comparator in studies examining the selectivity of newer secretagogues such as Ipamorelin.
It also shows activity on growth hormone release and has been studied for effects on cortisol and prolactin in animal models, though generally less selectively than Ipamorelin.
Handling and storage
GHRP-6 is supplied lyophilised and reconstituted with bacteriostatic water. Use gentle swirling, never shake, and store reconstituted solution refrigerated and protected from light.
Because GHRP-6 is commonly compared head-to-head with Ipamorelin and GHRP-2, researchers often order all three to run parallel study arms.
Frequently asked questions
- What is the difference between GHRP-6 and Ipamorelin?
- Both are ghrelin-receptor agonists, but GHRP-6 shows a stronger appetite-stimulation effect and less selectivity in published work. Ipamorelin is described as more selective for GHS-R1a with minimal effect on cortisol and prolactin.
- What generation is GHRP-6?
- GHRP-6 is a first-generation growth hormone releasing peptide, developed before GHRP-2, Hexarelin and the more selective Ipamorelin.
- How should GHRP-6 be stored?
- Lyophilised vials should be refrigerated or frozen. Reconstituted solution is kept at 2-8 °C and protected from light.
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All information on this page is provided for laboratory and educational reference only. Peptides Lab SA (PTY) Ltd supplies compounds strictly for in-vitro research use. Nothing here is medical advice, a dosing recommendation, or a claim of human safety or efficacy.