Abstract The CJC-1295 with DAC 2mg peptide pen contains a specialised formulation of the long-acting Growth Hormone-Releasing Hormone (GHRH) analogue. Unlike the standard “Mod GRF 1-29,” this variant incorporates a Drug Affinity Complex (DAC) attached to the epsilon amino group of Lysine at position 13. This crucial modification allows the peptide to covalently bind to serum albumin following administration. This binding protects the peptide from enzymatic degradation by DPP-IV and significantly reduces renal clearance, extending the biological half-life from minutes to approximately 6-8 days. This 2mg formulation is the premier reagent for research into continuous, basal elevation of Growth Hormone (GH) and Insulin-Like Growth Factor 1 (IGF-1), contrasting with the pulsatile effects of short-acting analogues.

Mechanism and Research Interest

Primary Biological Pathway: Albumin Bioconjugation The defining mechanism of CJC-1295 with DAC is its in vivo bioconjugation. The maleimide group within the DAC moiety reacts specifically with the free thiol group (Cys34) of serum albumin. This forms a stable peptide-albumin complex. Because albumin has a long circulatory half-life, the attached GHRH analogue remains in the bloodstream, continuously activating pituitary GHRH receptors. Research utilising the 2mg pen allows for the study of “GH bleed”—a state of constantly elevated basal GH levels—and its specific impact on lipolysis and steady-state IGF-1 production.

Secondary Research Finding: Enhanced Total IGF-1 Yield Due to its continuous action, CJC-1295 with DAC is far more effective at raising total weekly IGF-1 levels compared to pulsatile agents. The 2mg formulation is utilised in models of severe catabolism or growth restriction to quantify the maximal anabolic output achievable via the GHRH pathway. Studies often compare the “area under the curve” (AUC) of IGF-1 secretion between single weekly doses of DAC versus thrice-daily doses of Mod GRF 1-29.

Tertiary Research Finding: Pituitary Receptor Dynamics A critical area of investigation is the potential for receptor desensitisation. Continuous stimulation of G-protein coupled receptors typically leads to downregulation. However, research suggests that the GHRH receptor may maintain sensitivity even under tonic stimulation. The 2mg pen is used to challenge this hypothesis, allowing researchers to monitor pituitary responsiveness over weeks of continuous exposure to determine if “somatotroph exhaustion” is a genuine physiological risk.

Long-term Genomic and Safety Observations Long-term safety studies focus on the risks associated with non-pulsatile GH release. In healthy physiology, GH is pulsatile. Researchers use the 2mg dose to investigate whether continuous elevation alters fluid retention (edema) or insulin sensitivity differently than natural pulses. Genomic analysis of cardiac and renal tissue is also conducted to ensure that constant IGF-1 elevation does not drive pathological organ hypertrophy.

Product Specifications

• Purity: Validated at >98+% via High-Performance Liquid Chromatography (HPLC). We strictly verify the integrity of the maleimide reactive group to ensure that bioconjugation efficiency remains high upon administration.

• Appearance: The 3ml pen contains a clear, colourless, sterile liquid.

• Precision: The pen delivery system ensures accurate volumetric dosing. Since this peptide is long-acting, precise dosing is critical to avoid “stacking” effects where drug accumulation exceeds clearance rates over repeated weekly administrations.

• Storage: The product must be stored at 2∘C to 8∘C.

Storage and Shipping Guidelines

Refrigeration and Shelf Life The CJC-1295 with DAC 2mg Pen is a reactive peptide complex. It must be refrigerated (2∘C to 8∘C) to prevent premature hydrolysis of the maleimide group. The shelf life is 12 months in the sealed state. Once the pen is accessed, the bacteriostatic environment preserves the solution for 28 days. Researchers should note that the DAC moiety is sensitive to pH changes; the buffered solution in the pen is optimised to maintain stability.

Shipping Stability We utilise medical-grade thermal packaging. The peptide is stable for up to 72 hours at ambient UK temperatures. However, to preserve the reactive potential of the DAC, we recommend selecting the fastest available shipping option.

Freezing Warning Do not freeze. Freezing can cause the peptide to precipitate or the maleimide group to deactivate. A frozen pen will likely fail to bind albumin effectively in vivo, resulting in rapid clearance and a failure to sustain elevated GH levels. A frozen pen should be discarded.

Why Choose the Peptide Pro 3ml Pen Format?

The CJC-1295 with DAC 2mg Pen is the definitive tool for Basal GH Elevation Research. Standard vials of CJC-1295 DAC can be difficult to manage due to the specific solubility requirements of the complex. Furthermore, the confusion between “DAC” and “No DAC” variants often leads to incorrect dosing protocols.

Our 2mg pen provides a clearly labelled, sterile, and concentration-verified source of the long-acting variant. It allows researchers to administer single, weekly doses with high precision, simplifying longitudinal study protocols and reducing animal handling stress.

For researchers requiring pulsatile (physiological) stimulation, we recommend examining:

• CJC-1295 No DAC 10mg:  (For short-acting, synergistic research).

• Ipamorelin 10mg: (For selective pulse generation).

Disclaimer

This product is strictly for Research Use Only (RUO). It is not intended for human consumption, injection (e.g., for bodybuilding or anti-ageing), therapeutic use, or diagnostic procedures. The information provided is for educational and scientific reference only. Purchase is restricted to verified research institutions and qualified individuals. Any evidence of intended misuse for human application will result in immediate order cancellation and blacklisting, in compliance with UK research chemical regulations.