Comparison
Ipamorelin vs GHRP-2
Two ghrelin-receptor secretagogues doing the same job. Selectivity is what separates them: one raises growth hormone and little else, the other raises several things at once.
Both act on the same receptor to prompt a growth hormone pulse, and both are commonly paired with a GHRH analogue rather than run alone.
Selectivity is the difference people care about. GHRP-2 also raises cortisol and prolactin to some degree. Ipamorelin is described as the most selective of the family, giving a growth hormone pulse with comparatively little effect on either.
Set against that, GHRP-2 is generally described as producing the larger pulse. So the trade is a bigger effect with more collateral, against a cleaner effect that is smaller. That is the choice. No study in healthy adults has settled which side of it is right.
| Attribute | Ipamorelin | GHRP-2 |
|---|---|---|
| Receptor | Ghrelin / GHS-R | Ghrelin / GHS-R |
| Evidence level | Early human | Approved elsewhere |
| Selectivity | High. Little cortisol or prolactin effect | Lower. Raises cortisol and prolactin |
| Relative pulse size | Smaller | Larger |
| Appetite effect | Minimal | Noticeable in many reports |
| Dosing frequency | Once to three times daily | Once to three times daily |
Things worth knowing
- Appetite is the practical difference nobody expects. A ghrelin-receptor agonist acts on the hunger pathway, and GHRP-2 produces more of that. Whether that is welcome depends entirely on what you are running it for.
- Selectivity is a mechanistic description, not a safety finding. "Little effect on cortisol" means less than the alternative. It does not mean none.
- Both are usually paired with a GHRH analogue anyway, and the mechanistic argument lives in the pairing rather than in the choice between them.
Full profile
Ipamorelin
A selective growth hormone secretagogue that prompts a short pulse of GH release. Widely used, and supported almost entirely by early pharmacology rather than outcome trials.
Full profile
GHRP-2
A growth hormone releasing peptide approved in Japan as a diagnostic agent. It triggers a pulse of your own growth hormone rather than supplying any.
Related
This page is educational. It describes what published research reports, not what you should do. Peptides discussed here are largely not approved for human use, and nothing on Bioalmanac is medical advice.