Ipamorelin vs Sermorelin
A neutral, side-by-side comparison of two performance & growth hormone peptides — their mechanisms, dosing ranges, administration routes, side effects, and research evidence. For research and educational purposes only.
Ipamorelin
Ipamorelin is a selective growth hormone secretagogue (GHS) and ghrelin receptor agonist. It stimulates GH release with high selectivity — minimal cortisol or prolactin elevation compared to older GHRPs. Widely used in research protocols for body composition, sleep quality, and recovery.
Full profileSermorelin
Sermorelin is a synthetic analog of the first 29 amino acids of GHRH (Growth Hormone-Releasing Hormone). It was FDA-approved for pediatric GH deficiency diagnosis and is widely used off-label in anti-aging and performance medicine. It stimulates pulsatile GH release more physiologically than exogenous GH.
Full profile| Ipamorelin | Sermorelin | |
|---|---|---|
| Category | Performance & Growth Hormone | Performance & Growth Hormone |
| Also known as | NNC 26-0161, Ipamorelin acetate | GHRH 1-29, GRF 1-29 NH2, Geref |
| Evidence | Investigational (in trials) | FDA-approved |
| Dosing range | 100mcg–300mcg mcg, 1–3x daily (typically pre-sleep and/or pre-workout) | 100mcg–500mcg mcg, once daily (before sleep) |
| Administration | Subcutaneous injection, Intramuscular injection | Subcutaneous injection |
| Key side effects | Water retention (mild), Tingling / numbness in extremities, Increased appetite, Headache (transient) | Injection site redness, Headache, Flushing, Dizziness |
| Cited sources | 3 references | 1 reference |
Key differences
- Evidence level differs: Ipamorelin is investigational (in trials), while Sermorelin is fda-approved.
- Administration: Ipamorelin — Subcutaneous injection, Intramuscular injection; Sermorelin — Subcutaneous injection.
- Frequency: Ipamorelin is typically 1–3x daily (typically pre-sleep and/or pre-workout); Sermorelin is once daily (before sleep).
- Research depth: this profile cites 3 sources for Ipamorelin vs 1 for Sermorelin.
Can you stack Ipamorelin and Sermorelin?
synergistic: Complementary GH stack — similar to CJC/Ipam
Sermorelin (GHRH pathway) and Ipamorelin (ghrelin pathway) work synergistically for GH release. Sermorelin has a shorter half-life than CJC-1295 so pulses are less sustained, but the combination is well-tolerated and commonly used.
See the full compatibility matrixHow each works
Ipamorelin
Ipamorelin selectively stimulates GH release via the ghrelin receptor (GHS-R1a) without significantly elevating ACTH or cortisol — the feature that distinguishes it from GHRP-6 and GHRP-2 (Raun et al., 1998, in swine/rodent models). Human data are limited: a PK study in 40 volunteers established a ~2-hour half-life (Gobburu et al., 1999), and a Phase 2 trial for postoperative ileus (Beck et al., 2014) failed its primary endpoint. It is not FDA-approved, and claims about body composition or recovery are extrapolated from GH physiology, not human outcome trials.
Sermorelin
Sermorelin works by binding pituitary GHRH receptors to stimulate GH secretion within the body's natural feedback loop. Unlike synthetic GH, it does not suppress endogenous production. Clinical studies show improved body composition, sleep quality, and IGF-1 levels in GH-deficient adults. Its short half-life (~10 min) means it requires daily dosing.
This comparison aggregates public research and structured profile data for informational purposes only. It is not medical advice and does not recommend either compound for human use. Consult a qualified healthcare provider before considering any peptide.