CJC-1295 with or without DAC
CJC-1295 with DAC vs no-DAC — the half-life difference, dosing cadence, water retention trade-off, and which fits which goal.
Updated May 7, 2026 · 4 min read
CJC-1295 comes in two formulations that look similar on the vial label and behave very differently in your body. The DAC vs no-DAC choice changes the dosing cadence, the GH release pattern, and the side-effect profile.
What DAC is
DAC stands for Drug Affinity Complex — a chemical modification that lets CJC-1295 bind to serum albumin in your bloodstream. Albumin-bound CJC-1295 is shielded from enzymatic breakdown, which extends the half-life dramatically:
| Formulation | Half-life | Release pattern |
|---|---|---|
| CJC-1295 (no DAC) | About 30 minutes | Pulsatile — discrete GH spikes |
| CJC-1295 (with DAC) | About 6–8 days | Sustained — elevated GH baseline |
Same backbone peptide, different decoration, completely different pharmacology.
The pulsatile vs sustained trade-off
This is the entire decision:
| Property | No-DAC | With DAC |
|---|---|---|
| GH pattern | Pulses 1–3x daily | Continuous mild elevation |
| Mimics natural physiology | Yes | No |
| Pituitary fatigue concern | Low | Theoretical but not demonstrated |
| Water retention | Mild | More pronounced |
| Numbness/tingling | Occasional | Common |
| Injection cadence | 1–3x daily | Once weekly |
| Best paired with | Ipamorelin (synergistic pulse) | Often run alone |
| IGF-1 elevation | Moderate, follows pulse | Higher steady-state |
Pulsatile dosing preserves the body's natural GH rhythm. Sustained dosing flattens it but is much more convenient.
When no-DAC wins
The no-DAC formulation is the right choice when you want:
- Natural physiology preserved. Your body is designed for GH pulses, not flat elevation.
- Lower side-effect intensity. Water retention and tingling are much less reported.
- The Ipamorelin stack. No-DAC pairs cleanly with Ipamorelin for synergistic pulses; DAC doesn't pair as cleanly because it eliminates the pulse window.
- Flexibility. Run it for a cycle, stop, restart — no week-long washout.
The trade-off: 1–3 injections per day. Some users find this trivial; others find it the difference between sticking with the protocol and quitting.
When DAC wins
The DAC formulation is the right choice when you want:
- Convenience. One injection per week vs. daily.
- Sustained anabolic environment. For some recovery and body-composition goals, the continuous elevation is reportedly more useful than discrete pulses.
- Lower per-dose volume. Weekly dosing means smaller cumulative volume injected.
The trade-off: more reported side effects, less natural rhythm, longer washout if you want to come off.
Dosing reference
CJC-1295 (no DAC)
| Detail | Value |
|---|---|
| Half-life | 30 minutes |
| Typical dose | 100–300 mcg per injection |
| Cadence | 1–3x daily, often paired with Ipamorelin |
| Common timing | Pre-bed (always), pre-training, post-training |
CJC-1295 with DAC
| Detail | Value |
|---|---|
| Half-life | 6–8 days |
| Typical dose | 1–2 mg per week |
| Cadence | Once weekly |
| Common timing | Same day each week, often paired with rest day |
Reconstitution math
Both formulations typically ship in 2 mg or 5 mg vials. Standard mix:
2 mg vial + 2 mL bacteriostatic water = 1 mg/mL.
A 200 mcg dose (no-DAC) → 0.2 mL → 20 units on a U-100 insulin syringe.
A 1 mg dose (DAC, weekly) → 1 mL → 100 units.
The reconstitution calculator handles both math cases.
Practical recommendation
For most users new to GH secretagogues, the no-DAC + Ipamorelin stack is the better starting point:
- Closer to natural physiology
- Milder side-effect profile
- Easier to evaluate effects (clean pulses, clear timing)
- Flexible to start, stop, or adjust
DAC makes sense for users who:
- Have run no-DAC and want fewer injections
- Want continuous elevation for a specific recovery cycle
- Don't mind the higher water retention and tingling profile
Side effects to watch on DAC specifically
| Symptom | Why it matters |
|---|---|
| Persistent tingling or numbness | Possible carpal tunnel — reduce dose |
| Significant water retention | Reduce dose; consider reducing sodium |
| Joint aches | Often transient; persists past 2 weeks → reduce dose |
| Insulin sensitivity drop | Reduce dose; consider stopping |
DAC isn't intrinsically dangerous — it's just more pharmacologically aggressive. Adjust accordingly.