Ipamorelin vs GHRP-6: the honest comparison
Ipamorelin is the modern default; GHRP-6 is the older-generation compound most notable for its intense hunger-stimulating effect. Unless the goal is explicitly appetite stimulation, Ipamorelin is the right pick.
Side-by-side facts
| Ipamorelin | GHRP-6 | |
|---|---|---|
| Class | Ghrelin receptor agonist / GHRP (growth-hormone-releasing peptide) | Ghrelin-mimetic growth hormone secretagogue |
| Half-life | Approximately 2 hours | Approximately 15–60 minutes |
| Typical dose | 100–300 mcg per injection, 1–3x daily | 100–300 mcg per injection, up to 3x daily |
| Category | Growth hormone axis | GH secretagogue (GHRP) |
| FDA status | Not FDA approved. Research use only. | Not FDA approved. Research use only in the US. |
| Storage | Lyophilized refrigerated. | Lyophilized refrigerated. |
What they have in common
Both are GHRPs acting on the ghrelin/GHS receptor to trigger pituitary GH release. Both are research-only in the US. Both pair with a GHRH to produce a synergistic GH pulse.
When to pick Ipamorelin
Pick Ipamorelin when you want a clean GH pulse without appetite or cortisol effects — the right choice for most users, long cycles, and daily protocols.
When to pick GHRP-6
Pick GHRP-6 specifically when appetite stimulation is the desired outcome — recovery from illness, difficulty hitting caloric targets during aggressive bulks, or cachexia-adjacent research. The hunger response is not subtle.
Can you stack them?
No — same receptor, no additive benefit. Pick one GHRP.
The two compounds
Track either compound on iPhone
Peptide Protocol schedules doses, calculates reconstitution, and logs side effects for both — on iPhone, free to download.
See the app →Frequently asked questions
What is the main difference between Ipamorelin and GHRP-6?
GHRP-6 is the original GHRP and it dramatically raises ghrelin-driven hunger. Ipamorelin was designed specifically to preserve the GH-release effect while eliminating the hunger, cortisol, and prolactin side effects.
Can you stack Ipamorelin and GHRP-6?
No — same receptor, no additive benefit. Pick one GHRP.
Which is better, Ipamorelin or GHRP-6?
Ipamorelin is the modern default; GHRP-6 is the older-generation compound most notable for its intense hunger-stimulating effect. Unless the goal is explicitly appetite stimulation, Ipamorelin is the right pick.
When should I pick Ipamorelin?
Pick Ipamorelin when you want a clean GH pulse without appetite or cortisol effects — the right choice for most users, long cycles, and daily protocols.
When should I pick GHRP-6?
Pick GHRP-6 specifically when appetite stimulation is the desired outcome — recovery from illness, difficulty hitting caloric targets during aggressive bulks, or cachexia-adjacent research. The hunger response is not subtle.
Are Ipamorelin and GHRP-6 FDA approved?
Ipamorelin: Not FDA approved. Research use only. — GHRP-6: Not FDA approved. Research use only in the US.
Educational use only. Peptide Protocol is an informational tool. Nothing on this page constitutes medical advice. Many peptides are prescription-only or restricted in your jurisdiction. Always consult a licensed healthcare professional before injecting any compound.