Research comparison
Sermorelin vs CJC-1295
Sermorelin and CJC-1295 are both synthetic analogues of growth-hormone-releasing hormone based on the GHRH (1-29) sequence. They are studied for the same axis but sit at opposite ends of the stability spectrum: sermorelin is the minimal, short-lived fragment, while CJC-1295 is the stabilised, long-acting successor. This page compares them on objective structure and kinetics.
Side by side
| Sermorelin | CJC-1295 (with DAC) | |
|---|---|---|
| Peptide class | GHRH (1-29) — the native minimal fragment | Modified GHRH (1-29) with stabilising substitutions |
| Stability | Rapidly degraded by DPP-4 | Substitutions resist DPP-4; DAC adds albumin binding |
| Reported half-life | Very short (minutes) | Long (days, in the DAC form) |
| GH-release profile | Brief, pulsatile | Sustained (DAC form) |
| Research role | Classic short-acting GHRH reference | Long-acting GHRH analogue |
How they differ in research
Sermorelin is essentially the endogenous GHRH (1-29) fragment — biologically faithful but rapidly broken down, which is why its half-life is measured in minutes.
CJC-1295 takes that same backbone and adds substitutions that resist enzymatic breakdown; in its DAC form it also binds albumin, pushing persistence into the range of days. It is best thought of as the stability-engineered successor to sermorelin.
In research, sermorelin is often the short-acting reference point and CJC-1295 the long-acting comparator when studying how GHRH-analogue duration changes the GH/IGF-1 response.
Which suits which research question
Sermorelin suits research needing a short, native-like GHRH pulse; CJC-1295 suits designs needing sustained GHRH-analogue exposure. For a matched short-vs-sustained pair without albumin binding, compare the two CJC-1295 forms instead. All are for in-vitro laboratory research use only.
Frequently asked questions
Are sermorelin and CJC-1295 the same class?
Yes — both are GHRH (1-29) analogues studied on the growth-hormone axis. They differ in stability and half-life, not in the receptor they target.
Why does CJC-1295 last longer than sermorelin?
CJC-1295 carries substitutions that resist the DPP-4 enzyme that rapidly degrades sermorelin, and its DAC form additionally binds serum albumin — together extending its research half-life from minutes to days.
Which is more like natural GHRH?
Sermorelin. It corresponds to the native GHRH (1-29) fragment, which is also why it is short-lived. CJC-1295 is a stability-engineered modification of that sequence.
This comparison describes objective compound pharmacology reported in the research literature. It is not medical guidance and makes no human efficacy, dosing, or therapeutic claims. All products are supplied by CertaPeptides (CERTALAB S.R.L.), a reseller, for laboratory research use only — not for human or animal consumption.