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CJC-1295Also known as: Modified GRF 1-29

10 min readUpdated April 2026
Reviewed by:Dr. Joe S. Lancaster, MD(Board-Certified OB-GYN, Hormone & Longevity Specialist)

TL;DR — What is CJC-1295?

CJC-1295 is a synthetic growth hormone releasing hormone (GHRH) analog that signals the pituitary to produce and release growth hormone. It comes in two variants: with DAC (Drug Affinity Complex) for weekly dosing, or without DAC for preserving natural GH pulsatility. When combined with a growth hormone releasing peptide (GHRP) like Ipamorelin, CJC-1295 synergistically amplifies GH release—mimicking youthful growth hormone patterns without the cost and complexity of exogenous HGH.

Primary Function: Stimulates natural growth hormone release from the pituitary

Legal Status (US): Not FDA-approved; unscheduled research chemical

Fast Stats

Half-Life (no DAC)~30 minutes
Half-Life (with DAC)6-8 days
Standard Dose (no DAC)100mcg 2-3x/day
Standard Dose (DAC)2mg weekly
Best Combined WithIpamorelin (GHRP)
AdministrationSubQ injection

How CJC-1295 Functions in a Stack

The Longevity StackGH OptimizationThe Physique StackRecovery/Body Comp

Mechanism of Action

CJC-1295 is a modified version of the first 29 amino acids of natural growth hormone releasing hormone (GHRH 1-29). Four amino acid substitutions protect it from enzymatic breakdown, extending its activity.

GHRH Receptor Agonism

CJC-1295 binds to GHRH receptors on somatotroph cells in the anterior pituitary, triggering:

  • GH synthesis: Upregulates growth hormone gene transcription
  • GH release: Stimulates exocytosis of stored GH
  • IGF-1 elevation: GH stimulates hepatic IGF-1 production

DAC vs No-DAC

The critical decision when using CJC-1295 is whether to use the DAC variant:

CJC-1295 with DAC

  • Half-life: 6-8 days (binds to albumin)
  • Dosing: 1-2mg once or twice weekly
  • Pro: Convenient, sustained GH elevation
  • Con: Blunts natural GH pulsatility; continuous elevation

CJC-1295 without DAC (Mod GRF 1-29)

  • Half-life: ~30 minutes
  • Dosing: 100mcg 2-3 times daily
  • Pro: Preserves natural pulsatile GH release patterns
  • Con: Requires multiple daily injections

Which Variant to Choose

For most optimization goals, CJC-1295 without DAC is preferred because it maintains the natural pulsatile pattern of GH release. The DAC version provides convenience but at the cost of physiological release patterns. Use no-DAC combined with Ipamorelin for best results.

CJC-1295 + Ipamorelin Stack

The most effective use of CJC-1295 is in combination with Ipamorelin, a growth hormone releasing peptide (GHRP):

Why This Combination Works

  • GHRH (CJC-1295): Tells pituitary to make and release GH
  • GHRP (Ipamorelin): Amplifies the release signal
  • Synergy: Together produce 3-5x greater GH pulse than either alone

Standard Protocol

  • CJC-1295 (no DAC): 100mcg per injection
  • Ipamorelin: 100-200mcg per injection
  • Frequency: 2-3 times daily
  • Timing: Morning upon waking, post-workout, bedtime (30 min before sleep)
  • Administration: SubQ on empty stomach (fasting enhances GH release)

Optimal Dosing Windows

  • Morning: Amplifies natural cortisol awakening response
  • Post-workout: Enhances recovery during anabolic window
  • Bedtime: Synergizes with natural nocturnal GH surge (most important dose)

Expected Effects

With consistent use of CJC-1295 + Ipamorelin, expect:

  • Improved sleep quality: Often noticed within 1-2 weeks
  • Enhanced recovery: 2-4 weeks
  • Body composition changes: 4-8 weeks (fat loss, muscle tone)
  • Skin/hair improvements: 8-12 weeks
  • IGF-1 elevation: Measurable on bloodwork at 4-6 weeks

Side Effects

Common (Dose-Dependent)

  • Water retention: Mild, usually transient
  • Flushing: At injection site, brief
  • Increased hunger: Especially with GHRPs (ghrelin pathway)
  • Tiredness: Initially, as sleep depth increases
  • Headache: Occasional, usually dose-related

Potential Concerns

  • Glucose metabolism: GH can reduce insulin sensitivity at high doses
  • Carpal tunnel: Rare at peptide doses; more common with exogenous HGH
  • Cortisol increase: CJC-1295 with DAC may elevate cortisol (not seen with no-DAC)

Not a Replacement for HGH

While CJC-1295 + Ipamorelin can significantly elevate GH levels, they stimulate your own pituitary and are limited by your pituitary's capacity. They will not produce the same GH levels as exogenous HGH injections, but they also avoid many of HGH's downsides (cost, pituitary suppression, injection complexity).

Frequently Asked Questions

What is CJC-1295 used for?

CJC-1295 is used to increase growth hormone and IGF-1 levels naturally. Benefits include improved muscle growth, fat loss, recovery, sleep quality, and anti-aging effects.

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

CJC-1295 with DAC has a 6-8 day half-life, allowing weekly dosing but causing continuous (non-pulsatile) GH elevation. CJC-1295 without DAC has a 30-minute half-life, requiring multiple daily doses but preserving natural GH pulse patterns.

How do you stack CJC-1295 with Ipamorelin?

Inject 100mcg CJC-1295 (no DAC) + 100-200mcg Ipamorelin together, 2-3 times daily (morning, post-workout, bedtime). Always on empty stomach for best GH release.

Is CJC-1295 better than HGH?

CJC-1295 stimulates your own GH production rather than replacing it. It's less expensive, preserves pituitary function, and produces more physiological patterns—but cannot achieve the same absolute GH levels as exogenous HGH.

Bottom Line on CJC-1295

CJC-1295 (without DAC) combined with Ipamorelinis the gold-standard peptide approach to growth hormone optimization. It enhances natural GH pulsatility at a fraction of HGH's cost, with fewer side effects and no pituitary suppression. For anti-aging, recovery, body composition, and sleep quality, the CJC/Ipamorelin combination is hard to beat.

Medical Disclaimer

This content is for educational purposes only and is not medical advice. Always consult a qualified healthcare provider before starting any hormone therapy or peptide protocol. Never self-prescribe or adjust dosages without professional guidance.