GHRP-6 vs Ipamorelin
Same receptor, opposite design intent. GHRP-6 is the blunt first-generation tool whose hallmark is hunger; ipamorelin was engineered to release GH with minimal spillover.
GHRP-6
Pulses GH short-term, but its most reliable real-world effect is a surge in appetite; no long-term human outcomes and not approved.
Full GHRP-6 evidence reviewIpamorelin
Raises GH, but failed its one rigorous human efficacy RCT; no body-composition outcome data.
Full Ipamorelin evidence reviewSide by side
| GHRP-6 | Ipamorelin | |
|---|---|---|
| Marketed for | Muscle, recovery, 'anti-aging' | Muscle, fat loss, 'anti-aging' |
| Evidence grade | Clinical data | Clinical data |
| Family | GH axis | GH axis |
| Regulatory status | Not FDA-approved | Not FDA-approved |
| How it's obtained | Research-only | Research-only |
| Key human source | Jaffe, JCEM 1993 | Beck RCT, 2014 |
marks a row where the two differ. Evidence grades come from our evidence matrix, which grades each molecule on the human data for the use it is marketed for.
Our verdict
GHRP-6 does raise growth hormone in humans across intravenous, subcutaneous and oral routes, but it also raises ACTH and cortisol, and its most reliable real-world effect is a strong, dose-dependent increase in appetite. Ipamorelin was characterized as the first selective GH secretagogue, with little effect on cortisol or prolactin, yet when it was tested in a proper randomized trial for postoperative recovery of bowel function it missed its primary endpoint. Both are research-only with no long-term human outcome data for the uses they are marketed for, and neither has been compared against the other in a trial. The cytoprotective findings often cited for GHRP-6 are rodent work, not human outcomes.
GHRP-6 fits if
GHRP-6 is the relevant molecule if the question is ghrelin-like appetite biology or the older cross-route GH-stimulation literature.
Ipamorelin fits if
Ipamorelin is the closer match for a reader who cares specifically about a clean GH signal without the appetite and cortisol spillover.
Where to get it
Where to get peptide therapy
Clinician-led telehealth services that prescribe compounded peptides. The specific peptides offered vary by provider — confirm GHRP-6 availability before ordering.
