CJC-1295 No-DAC
Mod GRF 1-29 — Short-Acting GHRH Analogue
CJC-1295 no-DAC — also known as Modified GRF 1-29 or Mod GRF 1-29 — is the short-acting GHRH analogue that pairs with ipamorelin to produce the most studied GH pulse in secretagogue research. Without the albumin-binding DAC modification, it has a half-life of approximately 30 minutes and creates a discrete, physiological GH pulse when combined with a GHRP.
At a Glance
The combination of CJC-1295 no-DAC + ipamorelin is specifically designed to mimic the two-signal system the pituitary uses naturally: GHRH (the 'go' signal) and ghrelin (the amplitude regulator). Together they produce a synergistic GH pulse that is larger than either compound alone.
This pulsatile approach is preferred when researchers want to study GH effects without continuous elevation — preserving the natural rhythm of GH secretion that governs downstream effects on body composition, metabolism, and tissue repair.
Its short half-life is a feature, not a limitation — it means GH effects are discrete and time-bounded, not sustained. This is important for studies where the timing and amplitude of GH pulses matter.
This compound operates through several converging biological pathways, which helps explain the breadth of effects observed across different tissue and metabolic models.
GHRH Receptor Agonism
Binds pituitary GHRH receptors to trigger GH synthesis and release — the primary secretion signal in the hypothalamic-pituitary-GH axis.
Short Half-Life (~30 min)
Without DAC modification, rapidly cleared — creating a discrete GH pulse rather than continuous elevation. Physiologically closer to natural GHRH.
Synergistic with GHRPs
Produces a GH response significantly larger when combined with ipamorelin or other GHRPs than either compound alone — two-signal synergy.
GH Pulse Timing
Allows precise timing of GH pulses — particularly useful in sleep-aligned protocols where GH is studied in relation to slow-wave sleep architecture.
- Physiological GH pulse studies — pulsatile GH release mimicry
- Body composition research — lean mass and fat mass in combination with ipamorelin
- GH axis stimulation without continuous elevation
- Sleep-aligned dosing — GH pulse timed to slow-wave sleep cycles
- Bone mineral density — pulsatile IGF-1 elevation models
- Wound healing and tissue repair — GH pulse contribution to regeneration
- Anti-aging — GH axis decline studies in aging rodent models
CJC-1295 no-DAC vs DAC is fundamentally about physiological mimicry vs practical convenience — two different research use cases.
| Aspect | CJC-1295 no-DAC | CJC-1295 DAC | Sermorelin |
|---|---|---|---|
| Half-Life | ~30 minutes | ~8 days | ~10–20 minutes |
| GH Pattern | Discrete pulses | Sustained elevation | Discrete pulses |
| Dosing | 2–3x daily | Once weekly | Daily |
| Primary Stack | Ipamorelin | Standalone or ipamorelin | Ipamorelin or GHRP |
| Physiological Mimicry | High — discrete pulses | Low — continuous GH | Moderate |
Physiological GH pulse pattern — discrete pulses that match natural pituitary secretion rhythm
Synergistic with ipamorelin — two-compound combination produces larger GH response than either alone
Timing flexibility — short half-life enables precise pulse timing in research protocols
Multiple daily injections required — 2–3x daily protocol less convenient than weekly DAC dosing
This overview is strictly educational and based on publicly available scientific literature as of 2026. It does not constitute medical advice. All Helixera Labs products are for laboratory research use only. Not for human or veterinary use. · Helixera Labs LLC © 2026