CJC-1295 is a synthetic analog of growth hormone releasing hormone (GHRH), specifically a modified version of the first 29 amino acids of GHRH (GRF 1-29) with four amino acid substitutions that dramatically improve its stability and half-life. The modifications replace positions 2, 8, 15, and 27 with D-alanine, glutamine, alanine, and leucine respectively, increasing resistance to enzymatic degradation from the native peptide's 7-minute half-life to approximately 30 minutes for the base...

CJC-1295: Dosing & Research Guide

Overview

What is CJC-1295?

CJC-1295 is a modified version of your body's own growth hormone releasing hormone (GHRH). Specifically, it's the first 29 amino acids of GHRH with four strategic substitutions at positions 2, 8, 15, and 27. Those changes — swapping in D-alanine, glutamine, alanine, and leucine — make a huge difference. Natural GHRH gets chewed up by enzymes in about 7 minutes. CJC-1295 lasts roughly 30 minutes.

There are two versions and they're very different beasts. Without DAC (also called Mod GRF 1-29) has a ~30-minute half-life and produces pulsatile GH release — more like what your body does naturally. With DAC (Drug Affinity Complex) adds a chemical linker that grabs onto albumin in your blood, stretching the half-life to 6–8 days. That means sustained elevated GH levels instead of discrete pulses.

Clinical research on CJC-1295 with DAC demonstrated dose-dependent increases in GH and IGF-1. A Phase 2 study showed that a single 60 mcg/kg injection produced a 2–10 fold increase in GH levels sustained for 6 days, with IGF-1 elevations of 1.5–3 fold lasting up to 14 days [1]. The no-DAC version is preferred in research protocols that aim to preserve the natural pulsatile pattern of GH release, particularly when combined with a GHRP like Ipamorelin for synergistic effect.

Science

Mechanism of Action

CJC-1295 tells your pituitary gland to release growth hormone. Here's how each piece of the mechanism works:

GHRH Receptor Activation

CJC-1295 binds the GHRH receptor on your pituitary's somatotroph cells. This fires up adenylyl cyclase, boosts intracellular cAMP, and triggers GH production and release. The modified amino acids make the peptide resistant to DPP-IV — the enzyme that normally destroys GHRH in minutes [1].

Pulsatile vs. Sustained GH Release

Without DAC, you get GH pulses lasting 2–3 hours that respect your body's natural rhythm. That pulsatile pattern matters — constant GH exposure desensitizes receptors and brings the side effects you see with exogenous GH. The DAC version overrides that rhythm, keeping GH elevated for 6–8 days straight [2].

IGF-1 Axis Stimulation

Both versions boost circulating IGF-1 by activating GH receptors in the liver. IGF-1 is the molecule that actually delivers many of GH's anabolic benefits — protein synthesis, muscle growth, bone remodeling. With DAC, IGF-1 stays elevated for up to 14 days from a single shot. Without DAC, IGF-1 rises and falls with each GH pulse.

Synergy with GH Secretagogues

Here's why CJC-1295 and Ipamorelin are almost always used together: they hit different receptors on the same pituitary cells. CJC-1295 activates the GHRH receptor. Ipamorelin activates the ghrelin receptor (GHS-R). Together, the GH output is more than the sum of what either produces alone. True synergy.

Dosing

Dosing Protocol

DAC and no-DAC are dosed completely differently. What stays the same: timing around food matters for both.

Variant	Dose	Frequency	Duration	Notes
Without DAC (Mod GRF)	100 mcg	2–3x daily	8–12 weeks	Pre-sleep + post-exercise on empty stomach
With DAC	2 mg	Once weekly	8–12 weeks	Sustained GH elevation; simpler protocol
Mod GRF + Ipamorelin	100 mcg each	2–3x daily together	8–12 weeks	Most popular research combination

Dosing Notes
Always inject fasted. Food — especially fats and carbs — kills the GH response.
Hold off on eating for at least 20–30 minutes after you inject.
Optimal timing windows: immediately before sleep, upon waking (fasted), and post-exercise.
The pre-sleep injection capitalizes on the natural nocturnal GH pulse. This is considered the single most important dose.
Run it 8–12 weeks on, 4 weeks off. The break prevents your receptors from going deaf.

Preparation

Reconstitution Guide

Reconstitute the CJC-1295 with bacteriostatic water. It dissolves quickly. Don't shake it.

Remove the plastic cap from the CJC-1295 vial and wipe the rubber stopper with an alcohol swab. Allow to dry.
Draw the appropriate volume of bacteriostatic water into a sterile syringe (see concentrations below).
Insert the needle through the rubber stopper at a slight angle. Inject the water slowly against the inner wall of the vial — do not spray directly onto the peptide powder.
Allow the vial to sit for 1–2 minutes. Gently roll the vial between your palms if needed. Do not shake or vortex.
The solution should be completely clear and colorless. Discard if you observe any cloudiness, particulate matter, or discoloration.

10 mg vial (no DAC) + 2 mL BAC water: Concentration = 5,000 mcg/mL. For 100 mcg, draw 2 units (0.02 mL). Use a 0.3 mL insulin syringe for accuracy.

5 mg vial (with DAC) + 2.5 mL BAC water: Concentration = 2 mg/mL. For 2 mg, draw 100 units (1.0 mL).

Supplies Needed (12-Week Cycle, No DAC at 100 mcg 3x Daily)
3 vials CJC-1295 no DAC (10 mg each) — provides 30 mg total, covers 252 doses of 100 mcg with margin
2 vials bacteriostatic water (30 mL each)
252 insulin syringes (0.3 mL, 31 gauge for accuracy at small volumes)
Alcohol prep pads

Administration

Injection Technique

SubQ injection, same as most peptides. Where you inject doesn't matter for efficacy — the peptide reaches your pituitary through the bloodstream regardless.

Clean the injection site with an alcohol swab and allow it to air dry completely (approximately 30 seconds). Common sites: lower abdomen (2 inches from the navel), upper thigh, or upper arm.
Draw the dose. Insert the needle into the vial through the rubber stopper. Invert the vial and draw the calculated number of units slowly. Tap the syringe to move any air bubbles to the top, then push them out gently.
Pinch the skin at the injection site to create a fold of subcutaneous tissue. Insert the needle at a 45- to 90-degree angle in a quick, smooth motion. Release the skin fold.
Inject slowly. Depress the plunger steadily over 5–10 seconds. Withdraw the needle at the same angle it was inserted. Apply gentle pressure with a clean swab if needed.

Injection Site Rotation

Rotate your injection sites to prevent lipodystrophy (changes in the fat tissue under the skin). For belly injections, use a clock pattern around your navel. CJC-1295 (no DAC) injection volumes are very small (0.02 mL), making injections quick and virtually painless. Keep at least 1 inch between sites.

Storage

Storage & Stability

Storage depends on which version you're using. The DAC version holds up a bit better once reconstituted, thanks to its albumin-binding chemistry.

Lyophilized (Powder)

2–8°C (36–46°F)

Refrigerator. Stable for 24+ months sealed.

Lyophilized (Long-term)

-20°C (-4°F)

Freezer. Extended stability beyond 2 years.

Reconstituted

2–8°C (36–46°F)

Use within 21 days (no DAC) or 28 days (with DAC).

Avoid

Do not freeze reconstituted solution

Freezing causes peptide degradation and aggregation.

Storage Tips
Store vials upright, out of direct light.
If you see condensation on a cold vial, let it warm to room temp before opening — moisture getting inside is bad news.
Never re-freeze a reconstituted vial. If it sat out at room temp for more than 4 hours, toss it.
Pro tip: label your vials with the reconstitution date.

Safety

Side Effects & Considerations

Most side effects trace back to having more growth hormone in your system than usual.

Commonly Reported

Water retention and bloating — particularly during the first 1–2 weeks of use. Usually subsides as the body adjusts.
Tingling or numbness in extremities — carpal tunnel-like symptoms from GH elevation. More common at higher doses.
Increased hunger — especially within 30 minutes of injection. This is a direct GHRH effect on appetite centers.
Headache — usually transient, resolves with continued use.
Flushing or warmth at injection site.

Variant-Specific Considerations

The DAC variant may produce more persistent side effects (water retention, paresthesias) due to sustained GH elevation over 6–8 days.
The no-DAC version produces transient side effects that resolve within hours of the GH pulse subsiding.
The no-DAC version preserves natural GH pulsatility; the DAC version overrides it, which may affect sleep-related GH secretion patterns.
Timing matters: inject on an empty stomach. Food (especially fats and carbohydrates) blunts the GH release response.

Important

CJC-1295 is classified as a research peptide. It's not FDA-approved for any clinical use. Everything here is from published research — it's not medical advice.

Protocols

Stacking Protocols

The CJC-1295/Ipamorelin combo is probably the most popular peptide stack out there. And for good reason.

CJC-1295 + Ipamorelin (GH Optimization Stack)

When you activate both the GHRH receptor (via CJC-1295) and the ghrelin receptor (via Ipamorelin) at the same time, the GH response is multiplicative, not just additive. You get significantly more GH than either peptide would produce on its own.

Peptide	Dose	Frequency	Duration
CJC-1295 (no DAC)	100 mcg	2–3x daily (fasted)	8–12 weeks
Ipamorelin	200 mcg	2–3x daily (same injections)	8–12 weeks

Lifestyle Factors

These practices can make your GH protocol work noticeably better:

Sleep: The pre-sleep injection is the most important dose. Prioritize 7–9 hours of quality sleep. GH release peaks during slow-wave (deep) sleep; sleep deprivation dramatically reduces natural GH output.
Fasting windows: Maintain a minimum 2-hour fast before each injection. Elevated insulin from food intake directly suppresses GH release at the pituitary level.
Exercise: Resistance training and high-intensity interval training both stimulate endogenous GH release, which can compound the peptide's effect when timed correctly.
Body composition: Higher body fat levels are associated with reduced GH response to GHRH stimulation. Fat loss itself may improve peptide responsiveness over the course of a cycle.

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References

Literature & Citations

Teichman SL, Neale A, Lawrence B, et al. Prolonged stimulation of growth hormone (GH) and insulin-like growth factor I secretion by CJC-1295, a long-acting analog of GH-releasing hormone, in healthy adults. J Clin Endocrinol Metab. 2006;91(3):799-805. PubMed
Ionescu M, Frohman LA. Pulsatile secretion of growth hormone (GH) persists during continuous stimulation by CJC-1295, a long-acting GH-releasing hormone analog. J Clin Endocrinol Metab. 2006;91(12):4792-4797. PubMed
Alba M, Fintini D, Sagazio A, et al. Once-daily administration of CJC-1295, a long-acting growth hormone-releasing hormone (GHRH) analog, normalizes growth in the GHRH knockout (GHRHKO) mouse. Am J Physiol Endocrinol Metab. 2006;291(6):E1290-E1294. PubMed
Dodart JC, Bhatt DK, Bhatt RS, et al. CJC-1295 GRF analog: pharmacokinetics and pharmacodynamics in healthy volunteers. Growth Horm IGF Res. 2006;16(Suppl A):S63.
Nass R, Pezzoli SS, Oliveri MC, et al. Effects of an oral ghrelin mimetic on body composition and clinical outcomes in healthy older adults: a randomized trial. Ann Intern Med. 2008;149(9):601-611. PubMed
Veldhuis JD, Iranmanesh A, Ho KK, et al. Dual defects in pulsatile growth hormone secretion and clearance subserve the hyposomatotropism of obesity in man. J Clin Endocrinol Metab. 1991;72(1):51-59. PubMed

CJC-1295