Description
CJC-1295 & GHRP-2 Peptide Blend
Overview
The CJC-1295 & GHRP-2 peptide blend represents a combination of two peptides that may act synergistically to stimulate endogenous growth hormone (GH) secretion. CJC-1295 is a synthetic analog of growth hormone-releasing hormone (GHRH), while GHRP-2 is a synthetic hexapeptide analog of ghrelin, classified as a growth hormone secretagogue (GHS). By interacting with distinct receptors—CJC-1295 at GHRH receptors and GHRP-2 at GHS-R1a receptors—this blend is hypothesized to enhance GH pulsatility and amplify downstream anabolic signaling through IGF-1.
Peptide Composition and Chemistry
| Peptide | Amino Acids | Molecular Formula | Molecular Weight | Other Names |
|---|---|---|---|---|
| CJC-1295 | 29 (tetrasubstituted GRF 1-29) | C152H252N44O42 | 3367.9 g/mol | GRF 1-29 albumin conjugate, GHRH Derivative |
| GHRP-2 | 6 (hexapeptide) | C45H55N9O6 | 817.9 g/mol | Pralmorelin, GPA-748 |
Structural Features of CJC-1295:
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Derived from GHRH 1-29, with four amino acid substitutions to increase stability and bioactivity.
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May include a DAC (Drug Affinity Complex) component, which binds plasma proteins to prolong half-life and maintain receptor affinity.
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Enhances GH secretion over extended periods compared to endogenous GHRH.
Structural Features of GHRP-2:
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Hexapeptide ghrelin analog that binds GHS-R1a receptors in the hypothalamus and pituitary.
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Stimulates GH release while influencing appetite and energy balance via hypothalamic neuropeptides (NPY, AgRP) and mesolimbic pathways.
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May attenuate catabolic effects in muscle through GH-dependent pathways.
Mechanism of Action
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CJC-1295
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Binds to GHRH receptors on anterior pituitary somatotrophs.
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Activates G-protein coupled pathways, leading to cAMP-mediated signaling, transcription factor phosphorylation, and increased GH gene expression.
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Prolonged stimulation contributes to sustained GH and IGF-1 elevation.
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GHRP-2
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Binds to GHS-R1a receptors, antagonizing somatostatin and triggering rapid GH release.
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Influences hypothalamic appetite-regulating peptides (NPY, AgRP) and may impact energy homeostasis.
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Synergistic Effect
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CJC-1295 maintains GH secretion over time, while GHRP-2 provides an initial GH surge.
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Synergism can result in pulsatile GH release, preventing supraphysiologic peaks while maximizing anabolic and regenerative effects.
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Studies suggest combined administration can increase pulsatile GH secretion by 54-fold compared to controls.
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Pharmacokinetics
| Peptide | Half-Life | Duration of Action |
|---|---|---|
| CJC-1295 (No DAC) | ~30 minutes | Moderate GH elevation; effect 1–3 days |
| CJC-1295 (DAC) | ~6–8 days | Sustained GH elevation; prolonged IGF-1 effect |
| GHRP-2 | ~15–60 minutes | Rapid GH stimulation; short-acting |
Physiological Effects
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Muscle & Fat Metabolism: GH-induced lipolysis, fatty acid utilization, and protein synthesis. GHRP-2 may stimulate appetite, potentially balancing energy intake with anabolic growth.
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IGF-1 Activation: GH released from pituitary binds liver receptors, activating JAK-STAT pathways, leading to IGF-1 transcription and systemic anabolic effects.
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Lean Muscle Gain: Elevated GH and IGF-1 support muscle hypertrophy, tissue repair, and anti-catabolic processes.
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Energy Balance: GHRP-2 may increase hunger while promoting GH-driven fat metabolism, influencing overall energy homeostasis.
Research Findings
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Clinical studies suggest CJC-1295 may increase mean plasma GH by 2- to 10-fold and IGF-1 by 1.5- to 3-fold for extended periods.
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GHRP-2 accelerates time to peak GH secretion by 43% and can independently induce a 47-fold increase in pulsatile GH.
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Synergistic administration with CJC-1295 results in higher GH pulsatility and prolonged IGF-1 elevation, enhancing potential anabolic outcomes.
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Preclinical studies indicate potential for lean mass gain, anti-catabolic muscle effects, and tissue repair.
Applications
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Laboratory research on GH secretion, IGF-1 signaling, and anabolic pathways.
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Studies on muscle hypertrophy, tissue regeneration, and metabolism.
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Research into energy homeostasis, appetite regulation, and GH pulsatility modulation.
Important Note: This peptide blend is intended for research and laboratory purposes only and is not approved for therapeutic use in humans. Proper laboratory protocols must be followed.
References
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Ionescu M, Frohman LA. J Clin Endocrinol Metab. 2006;91(12):4792–4797. doi:10.1210/jc.2006-1702
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Yamamoto D, et al. Life Sci. 2008;82(9-10):460–466. doi:10.1016/j.lfs.2007.11.019
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PubChem CID 91976842, CJC1295 Without DAC
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PubChem CID 161340, GHRP-2 (Pralmorelin)
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Synergistic GH Secretion Research Studies





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