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Sermorelin vs Ipamorelin
Growth HormoneSermorelin and Ipamorelin both stimulate natural GH release but work through different receptors. Sermorelin is a GHRH analog (first 29 amino acids of GHRH) that mimics the body's natural GH-releasing rhythm. Ipamorelin is a selective ghrelin mimetic that triggers GH pulses without affecting cortisol, prolactin, or appetite. Sermorelin is gentler and often preferred for beginners; Ipamorelin is more selective with a cleaner side effect profile.
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Side-by-Side Comparison
| Aspect | Sermorelin | Ipamorelin |
|---|---|---|
| dosing | 200-300 mcg SubQ daily at bedtime | 200-300 mcg SubQ 2-3x daily |
| best for | Beginners, gentle anti-aging support, sleep improvement, gradual body composition changes | Clean GH elevation, fat loss, recovery, anyone wanting GH without appetite/cortisol effects |
| stacking | Can be combined — Sermorelin at bedtime for overnight GH, Ipamorelin post-workout for recovery pulses. Often one or the other is used with CJC-1295 instead. | — |
| half life | 10-20 minutes (short-acting, single daily dose) | ~2 hours (moderate, allows multiple daily doses) |
| mechanism | GHRH (1-29) analog — binds GHRH receptors to stimulate GH synthesis, mimics natural pulsatile rhythm | Selective GHS-R agonist — triggers GH release without activating cortisol, prolactin, or appetite pathways |
| fda status | Previously FDA-approved (Geref); approval withdrawn for commercial reasons, not safety | Not FDA-approved; research peptide |
| side effects | Injection site reactions, flushing, headache, dizziness | Minimal — occasional transient head rush |
Verdict
Sermorelin for gentle, sleep-focused GH support. Ipamorelin for cleaner, more targeted GH pulses. Ipamorelin is generally preferred due to selectivity and fewer sides. Both are excellent entry points into GH peptides.