Ipamorelin vs Sermorelin
Verdict: They pull the same growth-hormone lever from opposite sides. Sermorelin is a GHRH analog — it whispers to the pituitary through the 'release now' pathway and is the version wellness clinics have prescribed for decades. Ipamorelin is a ghrelin-mimetic secretagogue — a different receptor — prized for triggering a clean GH pulse without cortisol or appetite side effects. Alone, sermorelin is the clinically familiar choice; but the modern standard is ipamorelin combined with a GHRH analog, because hitting both receptors together is synergistic rather than additive.
Side by side
| Ipamorelin | Sermorelin | |
|---|---|---|
| Typical dose | 200 mcg–300 mcg | 200 mcg–500 mcg |
| Frequency | 1–3x daily, often before bed | nightly before bed |
| Administration | subcutaneous injection | subcutaneous injection |
| Common vials | 5 mg, 10 mg | 2 mg, 5 mg, 10 mg |
| Typical mix | 5 mg + 2 ml water | 5 mg + 2 ml water |
| Units for typical dose | 12 units (300 mcg) | 12 units (300 mcg) |
Two receptors, one gland
GHRH analogs (sermorelin, CJC-1295, tesamorelin) act on the GHRH receptor to amplify the size of natural GH pulses. Secretagogues (ipamorelin, GHRP family) act on the ghrelin receptor to trigger pulses and suppress somatostatin — the brake on GH release. Releasing the brake while pressing the accelerator is why combinations dominate protocols.
Selectivity is ipamorelin's edge
Older secretagogues raised cortisol and prolactin and triggered ravenous hunger (GHRP-6 famously so). Ipamorelin achieves comparable GH release with almost none of that, which is why it displaced the GHRP family in most stacks. Sermorelin, working through the GHRH pathway, never had those side effects — its limitation is simply a weaker solo effect with a very short half-life.
Practical dosing
Sermorelin: 200–500 mcg nightly before bed, timed to the natural GH pulse of early sleep. Ipamorelin: 200–300 mcg one to three times daily, also favoring the pre-bed slot. Both are cycled — continuous year-round use is where desensitization concerns live.
Can you stack them?
The canonical stack is ipamorelin + CJC-1295 (no DAC) — same logic as ipamorelin + sermorelin, but CJC's slightly longer half-life won the market. If your source is a clinic, sermorelin + ipamorelin prescriptions are functionally the same play.
More comparisons
Educational comparison based on commonly published research protocols — not medical advice or an endorsement of any compound.