Ipamorelin vs Sermorelin
Ipamorelin and sermorelin are both GH research staples that work on opposite halves of the GH axis. Ipamorelin is a GHRP; sermorelin is a GHRH analog. Understanding which lever each one pulls explains why they pair so well.
| Ipamorelin | Sermorelin | |
|---|---|---|
| Compound class | Selective GHRP (ghrelin-receptor agonist) | GHRH analog (GRF 1-29) |
| Primary target | GHS-R (ghrelin receptor) | GHRH receptor |
| Category | Growth Hormone | Growth Hormone |
| Administration | Subcutaneous, 1-3x daily | Subcutaneous, daily |
| Research focus | Clean GH pulse, minimal cortisol/prolactin | Foundational GH-axis research |
Key differences
- Mechanism: ipamorelin (a GHRP) triggers the GH pulse via the ghrelin receptor; sermorelin (a GHRH analog) signals through the GHRH receptor.
- Effect: ipamorelin initiates a clean, selective pulse; sermorelin reinforces the natural GHRH side of the axis.
- Pairing: because they hit complementary receptors, they are often combined for a fuller pulse.
- Both are subcutaneous and dosed daily, often at night.
Which is right for your research?
Ipamorelin and sermorelin target different receptors on the same axis. Use ipamorelin for a clean GHRP pulse, sermorelin for the GHRH side, or both together.
Frequently asked questions
What is the difference between ipamorelin and sermorelin?
Ipamorelin is a GHRP that acts on the ghrelin receptor, while sermorelin is a GHRH analog that acts on the GHRH receptor. They influence different parts of the GH axis.
Can ipamorelin and sermorelin be combined?
Yes. Because they target complementary receptors, combining a GHRP with a GHRH analog is a common research approach.
How are they dosed?
Both are subcutaneous and typically dosed daily, frequently at night to align with natural GH release.
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