CJC-1295: With DAC vs. Without DAC, and the Ipamorelin Blend
CJC-1295: WITH VS. WITHOUT DAC
CJC-1295 comes in two forms — with and without a modification called DAC — and is often paired with Ipamorelin. The three behave very differently in research settings. Here’s a plain-language breakdown to help researchers choose the right variant for their protocol.
Peptides In This Research Area
- CJC-1295 (No DAC)
- Ipamorelin
- CJC-1295 / Ipamorelin Blend (No DAC)
Research Overview
What CJC-1295 is
CJC-1295 is a lab-modified version of growth hormone releasing hormone (GHRH). The modifications help it bind more effectively and resist breaking down, which amplifies the body’s natural GH release pattern in research models.
What DAC changes
DAC (Drug Affinity Complex) is a chemical linker that attaches CJC-1295 to albumin in the blood. That one change is why researchers see two very different behavior profiles — a slow, steady signal versus a quick, sharp one.
Comparison at a glance
Variant | Half-Life | Release Pattern | Typical Use in Research |
CJC-1295 with DAC | ~6–8 days | Sustained, steady elevation | Studying long-term baseline GH/IGF-1 levels |
CJC-1295 without DAC (Mod GRF 1-29) | ~30 minutes | Sharp, short pulse | Studying natural pulsatile GH release |
CJC-1295 / Ipamorelin Blend | ~30 minutes | Amplified pulse (dual pathway) | Maximizing pulse strength in a defined window |
Ipamorelin alone | ~2 hours | Selective, mild pulse | Often paired with a GHRH analog for synergy |
Where Ipamorelin fits in
Ipamorelin works on a different receptor than CJC-1295, so pairing them activates two separate pathways at once — producing a stronger combined signal than either compound alone in research models. Ipamorelin is also more selective than older secretagogues, without notably raising cortisol or prolactin.
Because the DAC variant’s steady signal tends to blunt the sharp pulse Ipamorelin is meant to amplify, most research pairing CJC-1295 with Ipamorelin uses the no-DAC form, not the DAC form.
How researchers typically choose
It comes down to what’s being measured. Studying steady-state hormone levels over time favors the DAC variant. Studying pulse timing, frequency, or amplitude favors the no-DAC variant or the blend.
The core peptide sequence is the same. The DAC version has an added linker that binds it to albumin in the blood, extending its half-life from about 30 minutes to 6–8 days. Same target, very different behavior.
They act on two different receptors, so using them together produces a stronger GH pulse in research models than either one alone — and often at a lower dose of each.
Not typically. The steady signal from the DAC variant tends to blunt the sharp pulse Ipamorelin is meant to amplify, so most protocols pair Ipamorelin with the no-DAC form instead.
It's another name for CJC-1295 without DAC — the two terms are used interchangeably in research literature.
For Research Use Only (RUO). Not for human consumption, veterinary use, diagnostic use, or therapeutic purposes.