CJC-1295 (DAC) // Long-Acting GHRH
CJC-1295 with Drug Affinity Complex — a modified GHRH analog that binds to serum albumin for a dramatically extended half-life of 6–8 days. A single weekly injection maintains elevated GH and IGF-1 levels continuously. The convenience trade-off: it creates a sustained baseline GH elevation rather than the pulsatile pattern of the no-DAC version.
One injection. One week of elevated GH.
The Drug Affinity Complex (DAC) is a reactive chemical group that covalently bonds to circulating albumin after injection. This creates a massive molecular complex that avoids renal clearance and enzymatic degradation, extending the half-life from ~30 minutes (no-DAC) to 6–8 days. The result is continuous GHRH receptor stimulation throughout the week — convenient, but it sacrifices the pulsatile GH pattern that the no-DAC version preserves.
One shot, one week.
CJC-1295 with DAC is the simplest GH protocol available — a single subcutaneous injection once per week. No timing around meals, no multiple daily doses, no empty stomach requirement. The trade-off is that you lose the pulsatile GH pattern that many consider superior for receptor sensitivity. Some practitioners alternate between DAC (for convenience phases) and no-DAC + Ipamorelin (for optimization phases).
Convenience vs. physiology — the DAC debate.
CJC-1295 with DAC was originally developed by ConjuChem Biotechnologies as a long-acting GH secretagogue. Clinical studies demonstrated sustained IGF-1 elevation for 6–14 days after a single injection, with dose-dependent GH increases.
The primary debate in the community centers on pulsatile vs. continuous GH release. Natural GH secretion is pulsatile — large nocturnal pulses followed by daytime troughs. This pattern maintains receptor sensitivity. Continuous elevation (as with DAC) may cause some receptor downregulation over time, though clinical significance is debated.
Practically, many users report excellent results with the DAC version — improved body composition, recovery, sleep, and skin quality. The convenience factor (one injection per week) makes compliance dramatically higher than 2–3x daily protocols.
DAC vs. no-DAC — and the rest of the GH field.
| Compound | Half-Life | Frequency | GH Pattern | Convenience |
|---|---|---|---|---|
| CJC-1295 (no DAC) | ~30 min | 1–3x daily | Pulsatile | Low |
| CJC-1295 (DAC) | ~6–8 days | 1x weekly | Continuous | High |
| Sermorelin | ~10–20 min | 1x nightly | Pulsatile | Moderate |
| MK-677 | ~24 hours | 1x daily oral | Continuous | Highest |
| Tesamorelin | ~26 min | 1x daily | Pulsatile | Moderate |
What to watch for.
CJC-1295 (DAC)'s side effect profile is manageable with proper protocol adherence. Baseline blood work before starting and periodic monitoring during use is essential.
- Water retention (more common than no-DAC due to sustained GH)
- Flushing and warmth (GHRH response)
- Tingling in extremities (GH-mediated, usually mild)
- Increased appetite
- Vivid dreams (improved sleep architecture)
- Potential GH receptor desensitization with long continuous use
- Joint stiffness (dose-dependent GH effect)
- Injection site nodule (rare, due to albumin complex formation)
- IGF-1 (primary efficacy marker — will show sustained elevation)
- Fasting glucose and insulin (continuous GH affects glucose)
- HbA1c (monitor long-term glucose impact)
- Thyroid panel (GH affects T4→T3 conversion)
- Cortisol (morning draw)
- CBC and CMP (baseline monitoring)
- GH serum (less useful — will show sustained elevation, not pulses)
- Body composition (DEXA) at baseline and 12 weeks
- Can combine with Ipamorelin (adds GHRP signal on top of sustained GHRH)
- BPC-157 / TB-500 for recovery enhancement
- DSIP for sleep optimization (GH and sleep synergy)
- Do NOT combine with no-DAC version (redundant GHRH signal)
- Do NOT combine with exogenous GH (suppressive)
- Monitor glucose more closely than with no-DAC (continuous GH)
- Lyophilized: refrigerate at 2–8°C (36–46°F)
- Reconstituted: refrigerate, use within 28–30 days
- Protect from light and heat
- Do not freeze reconstituted solution
- More stable than no-DAC version after reconstitution
- Research grade: confirm ≥98% HPLC purity on COA
Compounds that complement CJC-1295 (DAC).
Maximum convenience, different physiology — know the trade-off.
CJC-1295 with DAC is the convenience play in GH optimization. One injection per week, no meal timing, no daily schedule — just sustained IGF-1 elevation. The trade-off is physiological: continuous GH rather than pulsatile. For most users pursuing general anti-aging, recovery, and body composition goals, this trade-off is acceptable. For those optimizing GH receptor sensitivity and maximizing acute GH peaks, the no-DAC + Ipamorelin daily protocol remains superior. Test IGF-1 at baseline and 4 weeks — you should see consistent elevation. Monitor fasting glucose, as sustained GH can affect insulin sensitivity more than pulsatile release.
Our free Protocol Guide includes the complete GH Optimization section with both DAC and no-DAC protocols — dosing, timing, blood work panels, and stacking recommendations.