Source comparison
CJC-1295 vs MK-677: Side-by-Side Comparison
Understanding how CJC-1295 vs MK-677 differ across mechanism, administration, kinetics, and experimental fit determines which compound delivers usable data rather than confounded results. The table below maps the key differentiators. Mechanism of Action GHRH r
This comparison does not assign a generated winner or score.
- Understanding how CJC-1295 vs MK-677 differ across mechanism, administration, kinetics, and experimental fit determines which compound delivers usable data rather than confounded results. The table below maps the key differentiators.
- Mechanism of Action
- GHRH receptor agonist—amplifies endogenous GH pulses
- GHS-R1a (ghrelin receptor) agonist—drives sustained GH secretion
- CJC-1295 preserves pulsatility; MK-677 overrides it
- Route of Administration
- Subcutaneous injection (reconstituted peptide)
- Oral capsule or tablet (non-peptide)
- MK-677 eliminates injection and cold storage complexity
- Typical Dosing Frequency
- 1–2mg weekly (once or twice per week)
- 10–25mg daily
- Dosing frequency reflects half-life and secretory pattern
- GH Release Pattern
- Pulsatile—discrete peaks aligned with circadian rhythm
- Sustained—24-hour elevation per dose
- Choose based on whether your model requires physiological rhythm
- IGF-1 Elevation
- Moderate—driven by pulsatile GH peaks
- High—sustained GH produces greater hepatic IGF-1 synthesis
- MK-677 consistently produces higher total IGF-1 output
- Storage Requirement
- −20°C (lyophilized), 2–8°C post-reconstitution
- Room temperature stable
- CJC-1295 requires cold chain; MK-677 does not
- Feedback Regulation
- Subject to somatostatin inhibition
- Resistant to somatostatin suppression
- MK-677 bypasses natural feedback—CJC-1295 respects it
- Appetite Effect
- Minimal to none
- Significant—ghrelin receptor activation increases appetite
- MK-677's appetite stimulation is mechanism-intrinsic, not a side effect
- Best Experimental Fit
- Sleep architecture, circadian metabolism, aging studies
- Anabolic signaling, appetite regulation, sustained IGF-1 models
- Mechanistic alignment determines which compound delivers clean data