Ipamorelin vs GHRP-2: the honest comparison
Ipamorelin is the cleaner compound for most users; GHRP-2 produces a larger GH pulse but raises cortisol, prolactin, and hunger more aggressively. Unless you specifically want the stronger pulse, Ipamorelin is the right default.
Side-by-side facts
| Ipamorelin | GHRP-2 | |
|---|---|---|
| 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 for therapeutic use. Used as a diagnostic agent for GH deficiency in some countries. Research use only in the US. |
| Storage | Lyophilized refrigerated. | Lyophilized refrigerated. |
What they have in common
Both are GHRPs — growth-hormone-releasing peptides that act on the ghrelin receptor (GHS-R) to trigger pituitary GH release. Both are typically paired with a GHRH (like CJC-1295) for synergistic effect.
When to pick Ipamorelin
Pick Ipamorelin when you want a selective, side-effect-minimal GHRP. Ipamorelin releases GH without meaningfully raising cortisol or prolactin, which is why it is the go-to GHRP for long-term or daily-use protocols.
When to pick GHRP-2
Pick GHRP-2 when you want maximum GH pulse amplitude and can tolerate (or want) increased appetite — useful during clean-bulk phases. GHRP-2 is also more extensively studied in clinical settings than Ipamorelin, with a longer research track record.
Can you stack them?
Generally not paired together — they act on the same receptor, so combining them does not stack. Choose the GHRP that fits your goal and pair it with a GHRH.
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-2?
Ipamorelin is selective for the GHS receptor and spares cortisol/prolactin. GHRP-2 is stronger but less selective, which is why long cycles on GHRP-2 are less common than on Ipamorelin.
Can you stack Ipamorelin and GHRP-2?
Generally not paired together — they act on the same receptor, so combining them does not stack. Choose the GHRP that fits your goal and pair it with a GHRH.
Which is better, Ipamorelin or GHRP-2?
Ipamorelin is the cleaner compound for most users; GHRP-2 produces a larger GH pulse but raises cortisol, prolactin, and hunger more aggressively. Unless you specifically want the stronger pulse, Ipamorelin is the right default.
When should I pick Ipamorelin?
Pick Ipamorelin when you want a selective, side-effect-minimal GHRP. Ipamorelin releases GH without meaningfully raising cortisol or prolactin, which is why it is the go-to GHRP for long-term or daily-use protocols.
When should I pick GHRP-2?
Pick GHRP-2 when you want maximum GH pulse amplitude and can tolerate (or want) increased appetite — useful during clean-bulk phases. GHRP-2 is also more extensively studied in clinical settings than Ipamorelin, with a longer research track record.
Are Ipamorelin and GHRP-2 FDA approved?
Ipamorelin: Not FDA approved. Research use only. — GHRP-2: Not FDA approved for therapeutic use. Used as a diagnostic agent for GH deficiency in some countries. 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.