Head to head
GHRP-2 against GHRP-6
The two original growth hormone releasing peptides, separated mostly by how much hunger each produces. Neither has a trial record supporting the multi-month use they are sold for.
Column A
GHRP-2Pralmorelin (Growth Hormone Releasing Peptide 2)
A second-generation GH secretagogue approved in Japan as a diagnostic agent, producing strong GH release with less appetite effect than GHRP-6.
Column B
GHRP-6Growth Hormone Releasing Peptide 6
An early GH secretagogue hexapeptide that strongly stimulates growth hormone and appetite.
Side by side, on the facts we can check
| Attribute | GHRP-2 | GHRP-6 |
|---|---|---|
| Category | Growth Hormone | Growth Hormone |
| FDA status | Not FDA-approved (approved in Japan as a diagnostic agent) | Not FDA-approved |
| Half-life | ~30-60 minutes | ~15-60 minutes |
| Molecular weight | 817.0 Da | 873.0 Da |
| Mechanism | Agonizes the ghrelin/GH secretagogue receptor to stimulate a strong pulse of growth hormone from the pituitary. | Agonizes the ghrelin/GH secretagogue receptor (GHS-R1a) to stimulate GH release and appetite. |
| Human studies cited | 2 | 0 |
| Legal status, US | Not approved; research use only | Not approved; research use only |
Frequently asked questions
What is the difference between GHRP-2 and GHRP-6?
GHRP-2: A second-generation GH secretagogue approved in Japan as a diagnostic agent, producing strong GH release with less appetite effect than GHRP-6. GHRP-6: An early GH secretagogue hexapeptide that strongly stimulates growth hormone and appetite.
Which has stronger research evidence, GHRP-2 or GHRP-6?
This database does not grade compounds. It counts what was run in people: 2 of the 3 studies cited on the GHRP-2 profile were human work, against 0 of 3 for GHRP-6. Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are GHRP-2 and GHRP-6 FDA-approved?
GHRP-2: Not FDA-approved (approved in Japan as a diagnostic agent). GHRP-6: Not FDA-approved.
Reviewed Sep 2026. This page sets two published records side by side. It is educational, it is not medical advice, and it contains no dosing protocols or recommendations for personal use.