Research comparison
GHRP-2 vs Ipamorelin
GHRP-2 and ipamorelin are both growth-hormone secretagogues — they act on the ghrelin/GHS receptor rather than the GHRH receptor. They are frequently compared because they illustrate a clean trade-off in this class: potency versus selectivity. This page compares them on objective pharmacology.
Side by side
| GHRP-2 | Ipamorelin | |
|---|---|---|
| Receptor target | Ghrelin / GHS receptor (GHS-R) | Ghrelin / GHS receptor (GHS-R) |
| Class | Growth-hormone-releasing peptide (GHRP) | Selective GH secretagogue |
| Selectivity | Also raises cortisol and prolactin in models | Minimal effect on cortisol and prolactin |
| Relative GH release | Potent | Clean but generally less potent than GHRP-2 |
| Research role | High-potency GHS reference | Selectivity reference in the GHS class |
How they differ in research
Both compounds act on the same receptor (GHS-R), so both drive GH release in models — but they differ in how 'clean' that signal is.
GHRP-2 is potent but less selective: in research it also stimulates cortisol and prolactin release, which can confound a study aimed only at the GH axis.
Ipamorelin is the selectivity benchmark of the class: it releases GH with minimal effect on cortisol and prolactin, which is why it is often chosen when a research design needs to isolate the GH response.
Which suits which research question
Choose ipamorelin when a research design needs a selective GH-axis signal with minimal cortisol/prolactin confound; choose GHRP-2 when the design calls for a more potent, classic GHRP reference. Both are supplied for in-vitro laboratory research use only.
Frequently asked questions
Are GHRP-2 and ipamorelin the same class?
Yes — both are growth-hormone secretagogues acting on the ghrelin/GHS receptor. They differ in selectivity: ipamorelin is more selective for GH release, GHRP-2 is more potent but also affects cortisol and prolactin in models.
Why is ipamorelin called selective?
In research models ipamorelin releases growth hormone with minimal effect on cortisol and prolactin, unlike GHRP-2 which raises both. That cleaner profile is what 'selective' refers to.
Which is more potent?
GHRP-2 is generally the more potent GH secretagogue of the two, at the cost of also stimulating cortisol and prolactin. Ipamorelin trades some potency for selectivity.
This comparison describes objective compound pharmacology reported in the research literature. It is not medical guidance and makes no human efficacy, dosing, or therapeutic claims. All products are supplied by CertaPeptides (CERTALAB S.R.L.), a reseller, for laboratory research use only — not for human or animal consumption.