Source comparison
CJC-1295 DAC vs Non-DAC: Research Implications
The DAC modification fundamentally changes the pharmacological profile from pulsatile (non-DAC) to sustained-continuous (DAC). This is not merely a convenience difference — it has mechanistic implications for research design. Pulsatile GH secretion (mimicked b
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- The DAC modification fundamentally changes the pharmacological profile from pulsatile (non-DAC) to sustained-continuous (DAC). This is not merely a convenience difference — it has mechanistic implications for research design.
- Pulsatile GH secretion (mimicked by CJC-1295 non-DAC or Ipamorelin) is the physiological norm and is required for: normal hepatic GH receptor (GH-R) expression (continuous GH downregulates GH-R); sexual dimorphic liver gene expression (pulsatile pattern produces male-pattern liver vs continuous produces female-pattern); epiphyseal growth plate stimulation; and avoidance of GH resistance (analogous to GnRH, continuous high GH paradoxically downregulates IGF-1 in some models through GH-R desensitisation).
- Continuous GH (mimicked by CJC-1295-DAC) provides research advantages for: sustained IGF-1 measurements avoiding 4-8h post-injection sacrifice windows; pharmacokinetic modelling of sustained release; evaluating downstream biology without the confound of GH pulse timing; and studying SOCS3-JAK-STAT5 desensitisation mechanisms at physiologically relevant sustained vs pulsatile GH levels.
- Researchers should specify which kinetic profile (pulsatile vs sustained) matches their research question — and include pair-fed controls to correct for GH-driven hyperphagia when body composition is an endpoint.