Whenever CJC-1295 comes up, the first question is nearly always the same: with DAC or without? That single difference alters the whole character of the molecule’s activity. Here is a plain explanation.
Key points
- DAC (Drug Affinity Complex) binds to a protein in the blood and greatly extends CJC-1295’s duration of activity.
- With DAC, the half-life is measured in days; without DAC (Mod GRF 1-29), activity lasts from minutes up to about an hour.
- Natural growth hormone release is pulsatile, which is why the choice of version matters in research design.
- Neither version is “right” in general — it depends on the research question.
What is DAC?
DAC stands for Drug Affinity Complex. It is a molecular attachment that binds to a protein circulating in the blood, substantially lengthening how long CJC-1295 remains active.
The core difference: duration of activity
| With DAC | Without DAC (Mod GRF 1-29) | |
|---|---|---|
| Half-life | Long (days) | Short (minutes to about an hour) |
| Pattern observed in research | A steadier, more sustained “level” | A sharp, time-limited “pulse” |
| Typical research interest | Sustained exposure | Mimicking a natural, pulsatile pattern |
Why this matters in research
The body releases growth hormone in pulses, or waves, rather than continuously. Researchers aiming to mimic that natural rhythm therefore tend to favour the short-acting version — usually without DAC and frequently combined with Ipamorelin. Those interested in a sustained level look at the DAC version instead. There is no universally correct option; the choice follows the research question.
Frequently asked questions
Which version is normally paired with Ipamorelin?
Usually the version without DAC. Our article on CJC-1295 and Ipamorelin explains why.
In what form is it supplied?
As a powder, which is usually reconstituted in the laboratory with bacteriostatic water. For concentration arithmetic, use our peptide calculator.
Where are the product details?
See CJC-1295 with DAC and CJC-1295 + Ipamorelin.
Research use only
All Evil Peptides products are supplied strictly as reference materials for laboratory research. They are not medicines, are not intended for human or veterinary use, and nothing in this article should be read as medical advice or as a claim about effects in people.