CJC-1295 with DAC
Clinical TrialsCJC-1295 with Drug Affinity Complex (DAC)
The long-acting GHRH analog: the DAC moiety binds albumin and extends the half-life to roughly 6-8 days, producing sustained GH elevation. This is NOT the same compound as the short-acting no-DAC version also sold as "CJC-1295".
Dose
1-2 mg
Route
Subcutaneous injection
Cycle
12-16 weeks
Storage
2-8°C (refrigerator) for up to 12 months; -20°C (freezer) for longer term
What is CJC-1295 with DAC?
CJC-1295 with DAC is a synthetic analog of Growth Hormone-Releasing Hormone (GHRH). It is designed to have a significantly extended half-life compared to native GHRH or other GHRH analogs like CJC-1295 without DAC (also known as Mod GRF 1-29). This extended half-life is achieved through its Drug Affinity Complex (DAC) technology, which allows it to covalently bind to endogenous albumin after injection, protecting it from enzymatic degradation. By mimicking the action of natural GHRH, CJC-1295 with DAC stimulates the pituitary gland to release growth hormone (GH) in a pulsatile and physiological manner. This sustained release of GH can lead to elevated levels of Insulin-like Growth Factor 1 (IGF-1), which is responsible for many of the anabolic effects attributed to GH. Research commonly explores its potential roles in promoting muscle growth, fat loss, improved recovery, and anti-aging.
Key Benefits
- Elevated baseline GH
- Improved sleep
- Recovery
Mechanism of Action
- GHRH receptor agonism
Best For
- Recovery
- Body composition
- Sleep quality
Body Systems

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Molecular Information
Molecular weight
3647.9 g/mol
Length
30 amino acids
Type
Growth Hormone-Releasing Hormone (GHRH) Analog
Amino acid sequence
Tyr-D-Ala-Asp-Ala-Ile-Phe-Thr-Gln-Ser-Tyr-Arg-Lys-Val-Leu-Ala-Gln-Leu-Ser-Ala-Arg-Lys-Leu-Leu-Ile-Gln-Asp-Ile-Leu-Ser-Arg(Lys-Maleimidopropionic acid-hCys)
CJC-1295 with DAC is a modified version of GHRH(1-29) which includes Drug Affinity Complex (DAC) technology, resulting in its extended half-life.
Pharmacokinetics
Time to peak
Approximately 2-6 hours after subcutaneous injection
Half-life
144 h
Time to clear
Over 7-10 days
Thorner, M.O. et al. (2007). 'Growth hormone-releasing hormone (GHRH) analogs: therapeutic applications and clinical trials'. Growth Hormone & IGF Research, 17(5), 415-422. and Teichman, S.L. et al. (2006). 'Prolonged and stable elevation of IGF-I in man following a single subcutaneous injection of CJC-1295, a long-acting analogue of GHRH'. The Journal of Clinical Endocrinology & Metabolism, 91(3), 799-805.
Research Indications
Elevating baseline GH and IGF-1 levels
Research indicates CJC-1295 with DAC effectively and sustainably increases trough growth hormone levels and subsequently IGF-1 concentrations by stimulating pulsatile GH release from the anterior pituitary.
Anti-aging research
Commonly investigated for its potential to mitigate age-related decline in GH and IGF-1, which is associated with various aspects of aging.
Research Protocols
| Goal | Dose | Frequency | Route |
|---|---|---|---|
| General GH/IGF-1 elevation and anti-aging research | 1 mg | Once per week | Subcutaneous injection |
| More pronounced body composition changes (muscle growth/fat loss) | 2 mg | Once per week | Subcutaneous injection |
| Aggressive research protocols | 1 mg | Twice per week | Subcutaneous injection |
| Synergistic GH pulsatility when paired with GHRPs (e.g., Ipamorelin) | 1 mg | Once per week | Subcutaneous injection |
| Longer-term maintenance of elevated GH/IGF-1 | 0.5 mg | Once per week | Subcutaneous injection |
Administration before sleep is often discussed in research due to the natural pulsatile release of growth hormone during sleep. However, due to its long half-life, timing within the day may have less impact on overall GH pulsatility compared to shorter-acting GHRH mimetics.
Peptide Interactions
- Synergistic
Ipamorelin (or other GHRPs like GHRP-2, GHRP-6)
Commonly co-administered. CJC-1295 with DAC provides a stable GHRH signal, while GHRPs provide a potent, acute GH pulse. This combination leads to a more robust and physiological GH release, often resulting in greater increases in IGF-1 than either compound alone.
- Compatible
Somatostatin (endogenous)
CJC-1295 with DAC works to counteract the inhibitory effects of somatostatin on GH release, thus enabling consistent GH secretion.
- Use Caution
Exogenous Growth Hormone (HGH)
Combining CJC-1295 with DAC with exogenous HGH can lead to supra-physiological levels of GH and IGF-1, potentially increasing the risk of side effects such as acromegaly, insulin resistance, and carpal tunnel syndrome. Generally not recommended in research protocols.
- Monitor Combination
Corticosteroids
Corticosteroids can suppress GH secretion and reduce the effectiveness of GHRH analogs. Researchers should monitor outcomes closely if co-administered.
- Monitor Combination
Insulin
GH and IGF-1 can affect insulin sensitivity. Individuals with pre-existing insulin resistance or diabetes should monitor blood glucose carefully if conducting research with CJC-1295 with DAC.
- Compatible
Thyroid Hormones
Thyroid hormones are essential for optimal GH function, and their adequate levels support the efficacy of GHRH analogs. No direct negative interaction is typically observed.
How to Reconstitute
- 1Gather materials: lyophilized peptide vial, bacteriostatic water (BAC water), sterile syringe (e.g., 1-3 mL), insulin syringe for administration, alcohol wipes.
- 2Remove the plastic cap from the peptide vial and wipe the rubber stopper with an alcohol wipe.
- 3Wipe the top of the BAC water vial with an alcohol wipe.
- 4Using the larger syringe, draw the desired amount of BAC water (e.g., 1 mL per 2 mg of peptide for a 2mg/mL concentration) and slowly inject it into the peptide vial, aiming the water stream at the side of the vial, not directly onto the lyophilized powder.
- 5Allow the peptide to dissolve naturally. Do not shake the vial. Gently swirl the vial or roll it between your hands for a few minutes if needed.
- 6Once fully dissolved, the solution should be clear. Store the reconstituted peptide in the refrigerator (2-8°C).
Always use bacteriostatic water for reconstitution to ensure sterility and extend shelf life. Avoid shaking or vigorous agitation, as this can denature the peptide. Reconstitute slowly and gently.
What to Expect
- Weeks 1-4: Initial subtle improvements in sleep quality and recovery may be noticed. Increased vivid dreams are also commonly reported.
- Weeks 4-8: More noticeable improvements in body composition, such as a slight decrease in body fat and improved skin elasticity. Enhanced recovery from exercise.
- Weeks 8-12: Continued improvements in body composition, with potential for increased lean muscle mass and further reductions in body fat. Enhanced energy levels.
- Weeks 12-16: Peak effects typically observed, including significant improvements in body composition, overall well-being, and recovery. Users may experience better joint health and increased bone density (long-term).
Side Effects & Safety
| Effect | Frequency | Severity |
|---|---|---|
| Injection site itch | Occasional | Mild |
| Flushing | Rare | Mild |
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