CJC-1295 without DAC — frequently catalogued as modified GRF(1-29) — grew out of a broad wave of late-twentieth-century peptide chemistry aimed at making growth-hormone-releasing hormone (GHRH) sturdier without altering how it signals. It shares that lineage with sermorelin, the earliest short GHRH fragment to see wide research use.
The stabilization problem
Native GHRH is degraded quickly once in solution, which sharply limited its usefulness as a durable research reagent. Investigators responded by introducing a handful of amino-acid substitutions intended to blunt that breakdown while preserving receptor engagement — the foundation of the analog's mechanism of action.
From GHRH fragment to named analog
The move from a bare truncated fragment to a defined, reproducible analog reflected a maturing of solid-phase synthesis, which made it practical to produce short, precisely modified peptides in consistent quality. That reproducibility is what allowed the molecule to become a catalog staple rather than a one-off preparation.
With and without DAC
The "no DAC" designation distinguishes this shorter-lived version from the DAC-bearing analog, which was engineered with an albumin-binding linker to persist far longer. The deliberate contrast between the two variants became a recurring organizing theme in growth-hormone-axis studies, letting researchers isolate the effect of duration.
Why it endured as a research tool
Its rapid, pulse-like action made it attractive for probing the naturally pulsatile patterns of GH release, and it slotted neatly into paired studies alongside ghrelin-mimetic secretagogues. It is also commonly discussed next to tesamorelin, another stabilized GHRH analog occupying a different point on the duration spectrum.
Where it stands
Today the no-DAC form remains a widely referenced short-acting benchmark within the GHRH-analog family. Background on the molecule sits in the CJC-1295 (no DAC) research 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.