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Two peptides. Two receptor pathways. One synergistic growth hormone pulse. Ipamorelin (GHRP) and CJC-1295 without DAC (GHRH analogue) are the most widely used combination protocol for body composition, recovery, and anti-aging research.
The pituitary releases growth hormone in response to two distinct signals: GHRH (growth hormone-releasing hormone) from the hypothalamus, and ghrelin acting through the GHS-R1a receptor. These pathways are additive — stimulating both simultaneously produces a larger GH pulse than either alone. That is the rationale behind the Ipamorelin + CJC-1295 combination.
Ipamorelin is a selective growth hormone-releasing peptide (GHRP) that mimics ghrelin and binds directly to the GHS-R1a receptor on pituitary somatotrophs. It triggers a clean GH pulse with minimal cortisol or prolactin elevation — one of the most selective GHRPs available. Fast-acting, short half-life (~2 hours), which means pulse timing can be controlled precisely.
CJC-1295 without DAC (also called Modified GRF 1-29) is a stabilized analogue of the first 29 amino acids of GHRH. It binds GHRH receptors and amplifies the GH release triggered by ipamorelin. Without the Drug Affinity Complex (DAC), its half-life is ~30 minutes — matching ipamorelin's timing window and avoiding the uncontrolled GH elevation associated with the DAC version.
Elevated GH and downstream IGF-1 support protein synthesis and muscle fiber development — particularly effective when aligned with resistance training.
GH is lipolytic — it directly promotes the breakdown of stored fat for energy. The dual-pulse stack produces higher GH peaks that amplify this fat-mobilizing effect.
Bedtime dosing aligns with the body's natural GH secretion during slow-wave sleep. Users commonly report deeper sleep and faster recovery from training within weeks.
Restored GH/IGF-1 levels support mitochondrial function, cellular energy production, and the general vitality that declines as natural GH drops after age 30.
IGF-1 is a primary driver of connective tissue repair and muscle regeneration. This stack is frequently run alongside BPC-157 and TB-500 for comprehensive injury recovery protocols.
Unlike synthetic HGH, the GHRH + GHRP combination preserves the pituitary's natural feedback mechanisms. The body maintains its own regulatory control over GH secretion.
Ipamorelin and CJC-1295 without DAC are injected together subcutaneously, typically at the same time (the same syringe or back-to-back). Timing matters: both peptides should be taken fasted (no food or high-insulin state within 2 hours) for maximum GH pulse response.
Common protocols run once daily at bedtime, or twice daily (morning + bedtime) for more aggressive body composition goals.
| Peptide | Dose Per Injection | Frequency | Notes |
|---|---|---|---|
| Ipamorelin | 100 – 300 mcg | 1–2x daily | Bedtime essential; morning optional for body comp goals |
| CJC-1295 (no DAC) | 100 – 300 mcg | Match ipamorelin | Inject at the same time as ipamorelin |
| Route | Subcutaneous — abdomen, upper thigh | ||
| Fasting Window | Inject 2+ hours after last meal, 30+ min before eating | ||
| Cycle Length | 8 – 16 weeks; 4–8 week break before repeat | ||
| Storage | Lyophilized: refrigerate. Reconstituted: use within 30 days. | ||
Ipamorelin and CJC-1295 have separate clinical research profiles. Their combination is supported by mechanistic data showing additive effects from dual-receptor GH stimulation, consistent with the well-established GHRH + GHRP synergy first documented in the 1990s.
Multiple studies confirm that combined GHRH and GHRP administration produces a GH pulse significantly larger than either peptide alone — the pharmacological basis for the Ipamorelin + CJC-1295 combination.
Clinical studies show ipamorelin is highly selective for GH release with minimal cortisol or prolactin elevation — an advantage over older GHRPs (GHRP-2, GHRP-6) that caused cortisol spikes at effective doses.
GH secretagogue studies in adults show improvements in lean body mass and reductions in adipose tissue with sustained use, mediated through GH/IGF-1 axis activation — effects consistent with restored youthful GH pulsatility.
CJC-1295 without DAC (Modified GRF 1-29) has a 30-min half-life matching GHRP timing. CJC-1295 with DAC extends to days, creating sustained GH elevation that blunts the pulse pattern — the no-DAC version is preferred for physiological mimicry.
The Ipamorelin / CJC-1295 base is frequently extended with recovery peptides for comprehensive protocols targeting both GH optimization and tissue healing.
CJC-1295 with DAC creates sustained GH elevation for several days, which sounds appealing but actually blunts the pulsatile pattern that makes GH physiology effective. The body's GH feedback system responds to pulses — sustained high levels desensitize receptors. CJC-1295 without DAC preserves the pulse, which is why it's preferred when combined with ipamorelin.
Yes — ipamorelin and CJC-1295 without DAC are commonly combined in a single syringe for injection. Draw ipamorelin first, then CJC-1295. Inject immediately after combining — do not premix and store.
Yes, significantly. Elevated insulin (from eating) suppresses GH release. For maximum GH pulse, inject at least 2 hours after your last meal and wait 30+ minutes before eating. This is why bedtime (8+ hours fasted during sleep) is the most effective timing window.
Sleep quality improvements are often noticed within 2–4 weeks. Body composition changes (fat loss, muscle development) require consistent use for 2–3 months before becoming measurable. IGF-1 normalization and sustained effects build over a full 12–16 week cycle.
≥99% with third-party COA confirming identity and purity for both peptides. Cinch Bio sources through Finnrick Analytics-verified suppliers with batch-specific documentation available on request.
Ipamorelin and CJC-1295 are sold for research purposes only and have not been approved by the FDA for human use. The information on this page is educational in nature and does not constitute medical advice. Consult a qualified healthcare professional before considering any peptide protocol. Individual results vary.
Third-party tested ipamorelin and CJC-1295 with Finnrick Analytics verification. Full COA on every batch. Ships within 24 hours.
Get Started TodayMedical Disclaimer: The information on this page is for educational purposes only and does not constitute medical advice. All protocols require evaluation and prescription by a licensed physician. You should consult a qualified healthcare provider before starting any new medical protocol. Individual results vary. Cinch Bio is not a pharmacy and does not dispense medications — all prescriptions are issued by independent licensed physicians and filled by licensed 503A compounding pharmacies.