CJC-1295 vs Sermorelin vs Ipamorelin — Growth Hormone Peptide Comparison
CJC-1295, Sermorelin, and Ipamorelin are the three most researched growth hormone secretagogue peptides. CJC-1295 and Sermorelin are both GHRH analogs — they mimic growth hormone releasing hormone. Ipamorelin is a GHRP — it works through a different receptor (GHS-R1a) to trigger GH pulses. Understanding their differences is key to understanding why they're often studied together.
| CJC-1295 | Sermorelin | Ipamorelin | |
|---|---|---|---|
| Class | GHRH analog | GHRH analog (first 29 amino acids) | GHRP (Growth Hormone Releasing Peptide) |
| Receptor | GHRH receptor | GHRH receptor | GHS-R1a (ghrelin receptor) |
| Half-life (without DAC) | ~30 minutes | ~10–15 minutes | ~2 hours |
| Half-life (with DAC) | ~6–8 days | N/A | N/A |
| GH Pulse Pattern | Pulsatile (without DAC) or sustained (with DAC) | Pulsatile — mimics natural GHRH | Pulsatile — selective GH trigger |
| Cortisol/Prolactin Effects | Minimal | Minimal | None — most selective GHRP studied |
| GH Output | Strong — 2–10x baseline in human studies | Moderate — comparable to natural GHRH | Moderate alone, synergistic when combined |
| FDA Status | Not approved | Approved (compounding) for GH deficiency | Not approved |
| Best Used | Standalone or stacked with Ipamorelin | When natural GHRH analog preferred | Always stacked — designed to complement GHRH |
Bottom Line
Sermorelin is the most established with the longest clinical history. CJC-1295 offers longer half-life and stronger GH output. Ipamorelin is almost never used alone — its value is as a GHRP to complement a GHRH analog like CJC-1295 or Sermorelin, creating synergistic GH release through dual receptor activation. The CJC-1295 + Ipamorelin stack is the most commonly researched combination.
For educational and research purposes only. Not medical advice. Not for human use.