CJC-1295 without DAC — often studied as the modified GHRH(1-29) fragment sometimes labeled mod-GRF(1-29) — is a growth-hormone-releasing-hormone analog whose proposed mechanism centers on engagement of the GHRH receptor. Its behavior in model systems is interpreted as a stabilized mimic of the body's own GHRH signal.
GHRH-receptor engagement
The peptide is proposed to bind the pituitary GHRH receptor, a class-B G-protein-coupled receptor. Receptor activation is associated with stimulation of adenylate cyclase, a rise in intracellular cAMP, and downstream signaling linked to growth-hormone synthesis and release in cell and tissue models. The ordered residue string that carries this information is read using general amino acid sequence principles.
Why the stabilizing swaps matter
The engineered substitutions do not change which receptor is engaged; they change how long the molecule survives to engage it. By resisting dipeptidyl-peptidase and related cleavage, the analog maintains a coherent signal in solution longer than unmodified GHRH(1-29), which is the practical basis of its use as a reagent.
Why "no DAC" matters mechanistically
The absence of the Drug Affinity Complex (DAC) means the molecule does not covalently anchor to albumin, so it is short-acting compared with the DAC variant. That short window makes it a useful probe for pulsatile-signaling questions, where transient rather than sustained receptor occupancy is the point of interest.
Complementary secretagogue pathway
Because GHRH-receptor and ghrelin-receptor pathways are distinct and can be studied together, the analog is frequently paired with selective secretagogues such as ipamorelin to examine how two upstream inputs combine in controlled preparations.
Interpreting results
In-vitro concentrations are set by assay design and receptor pharmacology, not by any human dosing logic. Foundational context is in the CJC-1295 (no DAC) overview.
Product page: CJC-1295 (no DAC) research vials.
Research Use Only. Supplied strictly for laboratory research and development — not for human or veterinary use, consumption, or any therapeutic or diagnostic purpose. This article is research education, not usage guidance.