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CJC-1295 vs Sermorelin vs Ipamorelin: A Research Comparison
These three peptides come up together constantly in growth-hormone-axis research because they act on the same axis from different angles. This comparison summarises how they differ by peptide class and what researchers study them for — strictly as research chemicals.
Quick comparison
| CJC-1295 | Sermorelin | Ipamorelin | |
|---|---|---|---|
| Class | GHRH analog | GHRH analog (GRF 1-29) | GHRP / ghrelin-receptor agonist |
| Peptide length | 30 aa (mod.) | 29 aa | 5 aa (pentapeptide) |
| Research target | GHRH receptor | GHRH receptor | GHS-R1a (ghrelin) receptor |
| Studied with | Often paired with a GHRP | Standalone GHRH model | Often paired with a GHRH analog |
GHRH analogs vs GHRPs
The key distinction is which receptor the peptide is studied against. CJC-1295 and Sermorelin are GHRH analogs — they are studied at the growth-hormone-releasing-hormone receptor. Ipamorelin is a GHRP (growth-hormone-releasing peptide) studied at the ghrelin receptor (GHS-R1a). Because the two receptor systems are complementary, research protocols often pair a GHRH analog with a GHRP, which is why CJC-1295 and Ipamorelin are so frequently studied together.
CJC-1295 vs Sermorelin
Both are GHRH analogs, but CJC-1295 is a modified, longer-acting analog in model systems, while Sermorelin corresponds to the natural GRF(1-29) fragment. Researchers select between them based on the stability profile their model requires.
Where Ipamorelin fits
Ipamorelin is a selective pentapeptide GHRP studied for its receptor selectivity in model systems. It is the GHRP most often paired with a GHRH analog in comparative research.
Sourcing verified material
Whichever you study, the sourcing checklist is the same: a lot-specific third-party COA (HPLC purity + mass-spec identity), US synthesis, and cold-chain shipping.