What is the difference between CJC-1295 with and without DAC?

The DAC (Drug Affinity Complex) version binds to albumin, extending the half-life to 6-8 days and causing sustained GH elevation. The no-DAC version (mod-GRF 1-29) has a 30-minute half-life and produces a single GH pulse per injection, more closely mimicking natural physiology. Most community protocols prefer no-DAC for this reason.

Do I need to fast before injecting?

GH release is blunted by elevated blood sugar and insulin. For best results, inject on an empty stomach - at least 2 hours after eating. The most popular timing is before bed (on an empty stomach) and immediately upon waking. Post-training is another common window.

Growth Hormone

CJC-1295 (no DAC)

Modified Growth Hormone Releasing Factor (1-29) without Drug Affinity Complex

The shorter-acting GH secretagogue for pulsatile release

CJC-1295 without DAC (also called mod-GRF 1-29) is a modified growth hormone releasing hormone analogue that preserves natural pulsatile GH release patterns. It has a shorter half-life than the DAC version, making it popular for more physiological dosing.

💉

Admin routes

Subcutaneous

📊

Popularity

Medium

✅

Side effects

Generally mild

🏪

AU vendors

0 rated

✓Key benefits

1Preserves natural pulsatile GH release pattern

2Synergistic when combined with GHRP peptides like ipamorelin

3Shorter half-life reduces risk of sustained GH elevation

4Stimulates endogenous GH production rather than replacing it

5Does not suppress natural GH axis when used at moderate doses

6Well-tolerated with decades of GHRH analogue research

📈What to expect

Week 1–2

Improved sleep quality and deeper sleep stages

Week 2–4

Enhanced recovery between training sessions

Week 4–8

Improved skin quality, fat loss around midsection

Week 8–12

Measurable body composition changes; increased lean mass

Based on community reports and published research. Individual results vary significantly.

💊Dosing protocols

Anti-aging / recovery

Dose

100 mcg

Frequency

2–3 times daily (paired with ipamorelin)

Duration

8–12 weeks, then 4 weeks off

Body composition

Dose

100–200 mcg

Frequency

Pre-bed and post-training

Duration

12 weeks on, 4 weeks off

Sleep optimisation

Dose

100 mcg + 100 mcg ipamorelin

Frequency

Once nightly before bed

Duration

Ongoing with periodic breaks

Dosing information is sourced from published research and community protocols. This is not a recommendation. Consult a healthcare professional.

Research status|Preclinical - based on well-characterised GHRH physiology

Overview

CJC-1295 without DAC, commonly referred to as mod-GRF (1-29), is a synthetic analogue of the first 29 amino acids of growth hormone releasing hormone (GHRH). Unlike CJC-1295 with DAC, which binds to albumin for extended duration, the no-DAC version has a half-life of approximately 30 minutes. This shorter duration preserves the natural pulsatile pattern of GH release rather than causing sustained elevation. It is almost always used in combination with a GHRP (growth hormone releasing peptide) such as ipamorelin for synergistic effects.

⚙️How it works

Binds to GHRH receptors on somatotroph cells in the anterior pituitary, stimulating the synthesis and release of growth hormone. The four amino acid substitutions (Ala2, Gln8, Ala15, Leu27) protect against enzymatic degradation while maintaining receptor binding affinity. Because it mimics the natural GHRH signal, the resulting GH pulse follows physiological feedback loops - the pituitary still responds to somatostatin inhibition, preventing excessive GH levels.

⚡Side effects

Flushing and warmth at injection site

mildCommon

Mild water retention

mildUncommon

Increased hunger (from GH pulse)

mildCommon

Tingling or numbness in extremities at higher doses

mildUncommon

📅Research history

1980s

GHRH (1-44) characterised; truncated GHRH (1-29) shown to retain full activity

1990s

Modified GRF (1-29) developed with four amino acid substitutions for stability

2000s

DAC version created for extended half-life; both versions studied

2010s

Mod-GRF + ipamorelin stack becomes dominant GH peptide protocol

2023

FDA cracks down on compounding pharmacies; availability shifts

Why 'no DAC' matters

The DAC (Drug Affinity Complex) version of CJC-1295 binds to albumin in the bloodstream, extending its half-life to 6-8 days. While this is convenient (fewer injections), it causes sustained GH elevation that does not mimic normal physiology. The pituitary naturally releases GH in pulses - especially during deep sleep. The no-DAC version triggers a single GH pulse per injection, which is why most protocols call for 2-3 daily injections timed around training and sleep.

The mod-GRF + ipamorelin stack

Combining mod-GRF (1-29) with ipamorelin is considered the standard GH peptide stack. Mod-GRF stimulates GH release via the GHRH pathway while ipamorelin does so via the ghrelin/GHS-R pathway. These two pathways are synergistic - the combined GH output is greater than either alone. Studies on GHRH + GHRP combinations show 2-3x greater GH release compared to either compound alone. This stack is preferred over straight GH because it preserves feedback regulation.

References

[1]Ionescu M, Bhatt DL. 'Pharmacokinetics of modified GRF 1-29.' Growth Hormone & IGF Research, 2006.
[2]Veldhuis JD, et al. 'Joint mechanisms of impaired growth-hormone pulse renewal in aging.' Journal of Clinical Endocrinology & Metabolism, 2009.

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Disclaimer: This guide is for educational and informational purposes only. It is not medical advice. The dosing protocols listed are sourced from published research and community reports and do not constitute a recommendation. Always consult a qualified healthcare professional before using any peptide. Australian regulations classify many peptides as Schedule 4 (prescription-only) substances. Check current TGA guidelines before purchasing.