What is CJC-1295?
CJC-1295 is a synthetic analog of GHRH — the growth hormone-releasing hormone that your hypothalamus naturally produces to signal the pituitary gland to release HGH. By mimicking this signal, CJC-1295 causes the pituitary to release more growth hormone in a sustained, physiologically appropriate pattern.
There are two main versions: CJC-1295 with DAC (Drug Affinity Complex), which binds to albumin in the blood and extends the half-life to 6–8 days, and CJC-1295 without DAC (also called Mod GRF 1-29), which has a 30-minute half-life and is often used for more targeted pulsing. The DAC version allows once or twice weekly dosing, making it highly practical for clinical use.
Why it’s so popular: CJC-1295 is almost always stacked with Ipamorelin because the two peptides work synergistically — CJC-1295 increases the amount of GH released while Ipamorelin increases the number of pituitary cells that release it. Together they produce a significantly amplified GH pulse. Read our full comparison guide.
Key benefits of CJC-1295
Here is what the research and clinical experience suggest CJC-1295 can do:
Increased GH output
Substantially raises growth hormone levels by amplifying the pituitary’s response to GHRH signaling.
Lean muscle gains
Elevated GH supports protein synthesis and muscle development, especially when combined with resistance training.
Fat metabolism
Higher GH levels promote lipolysis — the breakdown of stored fat for energy — particularly visceral fat.
Improved recovery
Accelerates recovery from training and injury by enhancing cellular repair and protein turnover.
Better sleep quality
GH is primarily released during deep sleep; CJC-1295 enhances this natural nocturnal pulse, improving sleep quality.
Anti-aging effects
Long-term GH optimization is associated with improved skin quality, bone density, and energy levels.
How does CJC-1295 work?
GHRH receptor activation
CJC-1295 binds to GHRH receptors on somatotroph cells in the anterior pituitary gland — the same receptors your body’s natural GHRH activates. This triggers the synthesis and release of HGH into the bloodstream. Because it works through the natural feedback loop, the body can still self-regulate GH levels, avoiding the suppression that occurs with direct HGH replacement.
DAC technology extends duration
The DAC form attaches to albumin — a protein naturally abundant in blood — which protects it from enzymatic breakdown and dramatically extends its half-life. This means a single injection can provide sustained GH stimulation for up to a week, versus the 30-minute window of the non-DAC version.
Synergy with GHRPs like Ipamorelin
CJC-1295 addresses one axis of GH release (the GHRH pathway), while GHRPs like Ipamorelin address another (the ghrelin/GHS-R pathway). Combining them amplifies the GH pulse by 4–10x compared to either peptide alone — which is why the CJC-1295 + Ipamorelin stack is considered the gold standard for GH optimization.
Dosing guide
Dosing varies depending on your goal and method of administration. Always work with a licensed provider to determine your specific protocol.
| Goal | Typical dose | Frequency | Method |
|---|---|---|---|
| Body composition | 1–2 mg | Once or twice weekly | Subcutaneous injection |
| Anti-aging | 1 mg | Once weekly | Subcutaneous injection |
| Stacked with Ipamorelin | 1 mg CJC + 200–300 mcg Ipa | 2–3x weekly | Subcutaneous injection |
| Non-DAC (Mod GRF 1-29) | 100–200 mcg | 2–3x daily | Subcutaneous injection |
Important: Dosing information here is educational only. The right protocol for you depends on your health history, goals, and body weight. A licensed clinic can prescribe and supervise your treatment safely.
Side effects & safety
CJC-1295 has a favorable safety profile. It is well-tolerated by the vast majority of users, and serious adverse events are rare in clinical use. The most commonly reported side effects are mild and transient.
Possible side effects include: Injection site redness or irritation, water retention (especially at higher doses), temporary fatigue after injection, and mild flushing. These typically resolve within hours of dosing.
Because CJC-1295 works within the body’s natural feedback loop rather than replacing GH directly, it does not cause pituitary suppression — a key advantage over synthetic HGH. Long-term safety data from human clinical use remains limited, which underscores the importance of working with a qualified, licensed provider.
Compare CJC-1295 with its most common stack partner: Ipamorelin overview | Ipamorelin vs CJC-1295 guide