Original GHRP-6: Discovery & Research History
GHRP-6 (Growth Hormone Releasing Peptide-6) — how it was originally developed, and what it has been studied for since.
How GHRP-6 Was Discovered
GHRP-6 was developed by Cyril Bowers and colleagues at Tulane University in the 1980s, as part of the original research program that established synthetic ghrelin-receptor agonists as a distinct class of growth hormone secretagogues — years before ghrelin, the receptor's natural hormone, was even discovered.
It is a synthetic hexapeptide (His-D-Trp-Ala-Trp-D-Phe-Lys-NH2) that binds the same receptor later studied for Ipamorelin and Hexarelin — GHSR1a — but predates both by well over a decade. GHRP-6's pharmacological profile is considerably less selective: alongside GH release, it produces a pronounced, reliably reproduced increase in appetite and triggers meaningful off-target increases in cortisol, ACTH, and prolactin.
What GHRP-6 Has Been Studied For
GHRP-6's non-selective profile is precisely what later research programs, including Novo Nordisk's development of Ipamorelin, set out to eliminate. GHRP-6 has a decades-long human research record establishing it as a potent, reliably reproducible GH secretagogue, and its receptor-binding pharmacology helped guide the eventual cloning of the growth hormone secretagogue receptor.
- Ghrelin-receptor (GHSR1a) pharmacology research
- Growth hormone secretagogue studies
- Orexigenic (appetite-stimulating) effect research
Read our GHRH & Growth Hormone research overview →
GHRP-6 discovery & history questions
Does GHRP-6's research history mean it's approved for a particular use?
No. This page describes how GHRP-6 was originally developed and what it has been studied for since — it is historical and educational context, not a claim about current regulatory approval, safety, or legal status anywhere. KYIN Peptides sells GHRP-6 strictly for laboratory research use.
What has GHRP-6 been studied for in research?
GHRP-6 is studied for ghrelin-receptor (GHSR1a) agonism in growth-hormone research, notable for its non-selective profile including pronounced appetite stimulation.
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