CJC-1295 No DAC vs CJC-1295 DAC: The Complete Research Breakdown
CJC-1295 comes in two versions that work very differently. The No DAC version (Mod GRF 1-29) produces pulsatile GH release and pairs with GHRP peptides. The DAC version lasts 6–8 days and is injected once or twice per week. Choosing the wrong one derails the research protocol.
CJC-1295 No DAC
Mod GRF 1-29
- ✓Half-life: 30–60 minutes
- ✓Pulsatile GH — mimics natural patterns
- ✓Pairs with Ipamorelin for amplified pulses
- ✓Daily dosing at 100–200 mcg
- ✓Lower pituitary desensitisation risk
CJC-1295 DAC
Long-acting GHRH analogue
- ✓Half-life: 6–8 days
- ✓Sustained baseline GH elevation
- ✓Once or twice weekly dosing at 2 mg
- ✓Simpler protocol — fewer injections
- ✓Blunts natural pulsatile GH pattern
Side-by-Side Comparison
| Factor | CJC-1295 No DAC | CJC-1295 DAC |
|---|---|---|
| Also Known As | Mod GRF 1-29, Modified GHRH(1-29) | CJC-1295 DAC, long-acting CJC |
| Half-Life | 30–60 minutes | 6–8 days |
| GH Secretion Pattern | Pulsatile — sharp GH spike then clearance | Sustained — elevated baseline GH |
| Dosing Frequency | 1–3× daily, or with GHRP peptides | Once or twice per week |
| Typical Dose | 100–200 mcg per injection | 2 mg per injection |
| Combines With | Ipamorelin, GHRP-2, GHRP-6 for amplified pulse | Typically used alone; can combine with Ipamorelin |
| IGF-1 Elevation | Moderate pulse-driven IGF-1 response | Sustained IGF-1 elevation over days |
| Mimics Natural GH Pattern | Yes — pulsatile, like endogenous GH | No — constant drip suppresses natural pulsation |
| Pituitary Desensitisation Risk | Low — pulses allow receptor recovery | Moderate — sustained stimulation may downregulate GHRH-R |
| Best Research Use Case | Pulse-based body composition, recovery, anti-aging | Simple weekly protocol, sustained IGF-1 elevation |
What the Drug Affinity Complex (DAC) Actually Does
Without DAC: The Pulsatile Approach
CJC-1295 No DAC (Mod GRF 1-29) has a 30–60 minute half-life in plasma, producing a sharp, high-amplitude GH pulse that clears rapidly. This mimics the natural pattern of endogenous GHRH-induced GH secretion — peaks followed by troughs that allow the pituitary to recover.
When combined with Ipamorelin (which activates the ghrelin receptor, GHSR), the two peptides synergise at two separate receptor systems to produce amplified GH output from a single co-injection. This is the most widely researched GH pulse protocol.
The key advantage is physiological fidelity — the pattern of GH release remains close to what the pituitary produces naturally, reducing the risk of receptor downregulation and suppression of endogenous GH production.
With DAC: The Long-Acting Approach
The Drug Affinity Complex is a lysine-biotin derivative attached to the peptide that allows CJC-1295 to covalently bind albumin in the bloodstream. Albumin has a half-life of 19 days, and while the CJC-1295 bond is reversible, this produces a functional half-life of 6–8 days.
A single injection of 2 mg CJC-1295 DAC elevates baseline GH and IGF-1 levels for approximately one week. This simplifies the protocol significantly — two injections per week instead of daily dosing.
The trade-off is that sustained GHRH receptor stimulation can cause receptor blunting over time, and the constant GH elevation removes the natural pulsatile pattern that some research suggests is important for optimal metabolic signalling.
Frequently Asked Questions
What is the difference between CJC-1295 No DAC and CJC-1295 with DAC?
CJC-1295 No DAC (also called Mod GRF 1-29) is a modified GHRH analogue with a half-life of 30–60 minutes, producing a natural pulsatile GH release similar to endogenous patterns. CJC-1295 with DAC has a Drug Affinity Complex that allows it to bind albumin in the blood, extending its half-life to 6–8 days and producing sustained, elevated baseline GH levels. No DAC is used with GHRP peptides like Ipamorelin for pulse-based protocols; DAC is used alone or as a weekly injection.
Is CJC-1295 No DAC the same as Mod GRF 1-29?
Yes — CJC-1295 No DAC and Mod GRF 1-29 refer to the same peptide: a modified version of GHRH(1-29) with four amino acid substitutions that increase plasma stability compared to the original GHRH(1-29). The 'No DAC' clarification distinguishes it from the longer-acting CJC-1295 with DAC.
Which is better for GH pulse research — No DAC or DAC?
For pulsatile GH secretion that mimics natural patterns, CJC-1295 No DAC is the research choice. It produces a sharp GH pulse 15–30 minutes post-injection and clears rapidly. When combined with Ipamorelin, the two peptides synergise at the pituitary for amplified GH release from a single injection. CJC-1295 DAC produces sustained GH elevation but blunts the natural pulsatile pattern, which has different implications for IGF-1 and downstream signalling.
What is the dosing protocol for CJC-1295 No DAC vs DAC?
CJC-1295 No DAC is typically dosed at 100–200 mcg per injection, 1–3 times daily, often combined with Ipamorelin (100–200 mcg). The most researched protocol is once daily before sleep. CJC-1295 with DAC is dosed at 2 mg once or twice per week due to its 6–8 day half-life. The DAC version does not require daily injections but also cannot be precisely timed with natural GH pulses.
Research use only. All products sold by JA Performance are strictly for laboratory and in vitro research purposes. Not for human consumption, medical use, or veterinary use.