What Is CJC-1295/Ipamorelin?
A research guide to the combined GHRH analog and ghrelin mimetic studied for synergistic growth hormone release.
The Basics
CJC-1295/Ipamorelin refers to the combination of two distinct peptides that work through complementary mechanisms to stimulate growth hormone release. CJC-1295 is a modified growth hormone-releasing hormone (GHRH) analog, while Ipamorelin is a selective growth hormone secretagogue receptor (GHSR) agonist. Together, they represent two different inputs to the same system.
The rationale for studying them in combination comes from their distinct mechanisms of action. CJC-1295 amplifies the GHRH signal (telling the pituitary to produce more GH), while Ipamorelin mimics ghrelin’s effect on the GHSR receptor (telling the pituitary to release it). Research has shown this dual-pathway stimulation can produce a greater GH response than either compound alone.
CJC-1295: The GHRH Analog
CJC-1295 is a 29-amino acid synthetic analog of GHRH. It exists in two primary forms studied in research: CJC-1295 with Drug Affinity Complex (DAC) and CJC-1295 without DAC (also called Modified GRF 1-29 or Mod GRF).
CJC-1295 DAC includes a maleimidopropionic acid linker that binds to serum albumin in vivo, dramatically extending its half-life to approximately 6-8 days. This creates sustained, elevated GH levels rather than pulsatile release.
CJC-1295 no DAC has a shorter half-life of approximately 30 minutes, producing a more physiological pulsatile GH release pattern. This form is more commonly paired with Ipamorelin in research protocols.
Ipamorelin: The Ghrelin Mimetic
Ipamorelin is a pentapeptide (5 amino acids) that acts as a selective agonist of the growth hormone secretagogue receptor (GHSR), the same receptor activated by the endogenous hunger hormone ghrelin. However, unlike ghrelin or other GHSR agonists like GHRP-6, Ipamorelin is notably selective.
Why selectivity matters: Ipamorelin stimulates GH release without significantly affecting cortisol, prolactin, or appetite at the concentrations used in published studies. This selectivity makes it a cleaner research tool for studying GH pathways in isolation, without the confounding variables introduced by less selective secretagogues.
The Combination Rationale
The research interest in combining CJC-1295 (no DAC) with Ipamorelin stems from the synergistic interaction between GHRH and GHSR signaling. Published research has demonstrated that simultaneous activation of both pathways produces a GH response that exceeds the additive effects of either compound alone.
This synergy occurs because the two peptides work through different receptor systems on the same pituitary somatotroph cells. CJC-1295 stimulates GH synthesis and amplifies the release signal, while Ipamorelin triggers the release mechanism through the ghrelin pathway. The result is a more robust, pulsatile GH response that more closely mimics natural physiological patterns.
Areas of Active Research
Growth hormone physiology. The combination is studied as a model for understanding the interplay between GHRH and ghrelin pathways in GH regulation. Research has focused on concentration-response relationships, pulse frequency, and feedback mechanisms.
Body composition. Studies have examined effects on lean mass, fat mass distribution, and metabolic rate. The pulsatile GH release pattern produced by the no-DAC combination is of particular interest for body composition research.
Tissue-signaling markers. GH’s established role in tissue repair has led to research examining the combination’s effects on tissue-response markers, collagen synthesis, and cellular regeneration in laboratory models.
What Researchers Should Know
Both CJC-1295 and Ipamorelin are supplied in lyophilized form and prepared with bacteriostatic water. When used in combination research protocols, they are typically prepared separately and administered together or sequentially.
Research-grade material should have purity of 98% or higher for each component, verified independently by HPLC with batch-specific certificates of analysis. Researchers should verify that their supplier tests each peptide individually rather than relying on a single combined analysis.
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