CJC-1295: A Deep Dive into GHRH Analogs for Research

03/30/2026 | Bio Bulk Peptides |

CJC-1295 is a synthetic tetrasubstituted 29-amino acid peptide analog of Growth Hormone Releasing Hormone (GHRH). Originally developed by ConjuChem Biotechnologies, this compound was designed to extend the half-life of native GHRH(1-29) while maintaining its biological activity. By modifying specific amino acids within the peptide sequence, researchers created a molecule resistant to enzymatic degradation, specifically by the enzyme dipeptidyl peptidase-IV (DPP-IV).

In laboratory settings, CJC-1295 is frequently investigated for its ability to stimulate the anterior pituitary gland, leading to the endogenous secretion of growth hormone (GH) and a subsequent increase in Insulin-like Growth Factor 1 (IGF-1) levels.

Molecular Specifications

  • Molecular Formula: C152H252N44O42
  • Molecular Weight: 3367.9 g/mol
  • Sequence: Tyr-D-Ala-Asp-Ala-Ile-Phe-Thr-Gln-Ser-Tyr-Arg-Lys-Val-Leu-Ala-Gln-Leu-Ser-Ala-Arg-Lys-Leu-Leu-Gln-Asp-Ile-Leu-Ser-Arg-NH2
  • Modifications: Substitution of D-Alanine, Glutamine, Alanine, and Leucine at positions 2, 8, 15, and 27 respectively.
  • Physical State: Lyophilized white powder
  • Storage: -20°C (Long-term), 2-8°C (Short-term)

Mechanism of Action: The Pituitary Pathway

The primary mechanism of CJC-1295 involves its binding to GHRH receptors (GHRHR) located on the somatotroph cells of the anterior pituitary gland. Unlike exogenous growth hormone administration, which can suppress the body’s natural production, CJC-1295 acts as a secretagogue, encouraging the natural release process.

  1. Receptor Activation: Upon introduction to a cellular environment, the peptide binds to the GHRH receptor.
  2. cAMP Stimulation: This binding activates adenylyl cyclase, leading to an increase in intracellular levels of cyclic adenosine monophosphate (cAMP).
  3. GH Synthesis and Secretion: Elevated cAMP levels trigger protein kinase A (PKA) pathways, which stimulate both the transcription of the growth hormone gene and the release of stored GH vesicles.
  4. Pulsatile Release: Research indicates that CJC-1295 maintains the physiological pulsatile release of GH. While the baseline (trough) levels of GH are elevated, the natural spikes or "pulses" characteristic of endogenous GH secretion remain intact, which is a critical area of study for metabolic efficiency and receptor sensitivity.

Abstract illustration of CJC-1295 peptide binding to a GHRH receptor for research.

CJC-1295 DAC vs. CJC-1295 No DAC (Mod GRF 1-29)

A significant point of distinction in research is the presence or absence of the Drug Affinity Complex (DAC). This modification drastically alters the pharmacokinetic profile of the peptide.

CJC-1295 DAC

CJC-1295 with DAC includes a maleimidopropionic acid group at the C-terminus. This group allows the peptide to form a covalent bond with the free thiol group of serum albumin (specifically Cys34) once in the bloodstream.

  • Half-life: Extended significantly, ranging from 5.8 to 8.1 days.
  • Research Focus: Long-term studies where stable, elevated GH and IGF-1 levels are required over several days without frequent administration.
  • Binding: Irreversible covalent bioconjugation to circulating albumin prevents rapid renal clearance and enzymatic breakdown.

CJC-1295 No DAC (Modified GRF 1-29)

Often referred to in literature as Mod GRF 1-29, this version lacks the Drug Affinity Complex. While it still contains the four amino acid substitutions that make it resistant to DPP-IV, it does not bind to albumin.

  • Half-life: Approximately 30 minutes.
  • Research Focus: Short-term physiological modeling where a specific, acute pulse of GH is desired.
  • Comparison: It is chemically identical to CJC-1295 but lacks the C-terminal linker required for albumin conjugation.

Research institutions often utilize CJC-1295 DAC when investigating chronic metabolic changes, whereas CJC-1295 No DAC is favored for studies focusing on acute GH spikes.

Research Implications and Areas of Study

Muscle Tissue Repair and Protein Synthesis

Investigating CJC-1295 in the context of cellular repair is a prominent area of biotechnology research. By increasing circulating IGF-1, the peptide may influence satellite cell activation: the primary mechanism through which muscle fibers repair and grow after damage. Researchers explore these pathways to understand potential applications in preventing muscle wasting or accelerating recovery from injury in animal models.

Lipid Metabolism and Fat Loss Studies

Growth Hormone is known to be a potent regulator of lipid metabolism. In research environments, CJC-1295 is studied for its lipolytic effects (the breakdown of fats).

  • Mechanism: GH stimulates the breakdown of triglycerides in adipose tissue.
  • Outcome Research: Studies investigate the reduction of visceral adipose tissue and the alteration of the basal metabolic rate in response to sustained GH elevation.

Comparison of CJC-1295 molecular structures with and without the DAC complex.

Bone Density and Connective Tissue

As a secondary effect of IGF-1 elevation, researchers observe the impact of CJC-1295 on mineral density and collagen synthesis. These studies are essential for understanding the long-term structural implications of GHRH analogs on the skeletal system and joint integrity.

The Importance of Bulk Sourcing for Longitudinal Research

For research institutions and laboratories, the transition from pilot studies to long-term longitudinal research requires a high degree of supply chain stability. Bulk sourcing of peptides like CJC-1295 is critical for several technical reasons:

  1. Batch Consistency: Utilizing a single large batch for an entire study minimizes variables related to purity fluctuations between different production runs. This ensures that the data collected over months or years is comparable and statistically significant.
  2. Analytical Verification: Sourcing in bulk allows for more comprehensive third-party testing. Institutions can verify the COA (Certificate of Analysis) for a substantial quantity, ensuring that the peptide meets the stringent purity requirements (typically >98%) necessary for sensitive biological assays.
  3. Cost-Effectiveness: Large-scale research projects often operate on limited budgets. Bulk procurement from specialized suppliers like biobulkpeptides.com provides the economy of scale necessary to sustain multi-year research projects without compromising on the quality of the chemical reagents.
  4. Logistics Management: Maintaining a centralized stock of lyophilized material reduces the risk of experimental downtime caused by shipping delays or stockouts.

Stylized model of muscle tissue repair and protein synthesis in peptide research.

Preparation and Handling in Laboratory Settings

To maintain the structural integrity of CJC-1295, precise handling protocols must be observed. The peptide is highly sensitive to temperature and mechanical stress.

  • Reconstitution: Use Bacteriostatic Water or sterile 0.9% Sodium Chloride. The diluent should be added slowly down the side of the vial to avoid agitation or foaming, which can denature the peptide.
  • Storage: Prior to reconstitution, the lyophilized powder should be stored in a freezer at -20°C. After reconstitution, the solution must be refrigerated at 2-8°C and used within a specific timeframe (typically 14-28 days) to ensure maximum potency.
  • Avoid Light Exposure: UV light can degrade the peptide bonds; vials should be kept in a dark environment or opaque containers.

Comparative Analysis of GHRH Analogs

While CJC-1295 is a primary focus for many investigators, it is often compared to other secretagogues such as AOD9604 or Glutathione in broader metabolic studies. However, CJC-1295 remains unique due to its specific targeting of the GHRH receptor and, in the case of the DAC version, its unparalleled half-life in the analog category.

For research focusing on combined signaling, CJC-1295 is sometimes studied alongside GHRPs (Growth Hormone Releasing Peptides) like Ipamorelin. This combination is researched to observe the synergistic effect of targeting both the GHRH receptor and the Ghrelin receptor (GHS-R1a) simultaneously, which may result in a more significant GH release than either peptide used in isolation.

Standardized laboratory vials representing batch consistency in bulk peptide sourcing.

Final Considerations for Researchers

When selecting CJC-1295 for research purposes, investigators must prioritize chemical purity and the specific pharmacokinetic needs of their study (DAC vs. No DAC). The data suggests that CJC-1295 is a robust tool for exploring the endocrine system, protein metabolism, and tissue regeneration.

For further information on product specifications or to view the full range of available research materials, visit the products page.

Storage Instructions

  • Lyophilized Powder: Store at -20°C for up to 24 months.
  • Reconstituted Solution: Store at 2-8°C for no more than 28 days.
  • Transport: Use cold-chain logistics to maintain temperature stability during transit.

DISCLAIMER: FOR RESEARCH USE ONLY. NOT FOR HUMAN USE.

The information provided in this article is for educational and informational purposes only. The compound CJC-1295 is intended strictly for laboratory research and in-vitro studies. It is not intended for diagnostic or therapeutic use in humans or animals. Any use of this material outside of a controlled laboratory environment is strictly prohibited. Research materials must be handled by qualified professionals in accordance with local laws and institutional safety guidelines.

For Research Purposes Only. Not for human use.
Strictly For Research Use Only.
Not for human consumption.