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CJC-1295 vs Ipamorelin
Growth HormoneCJC-1295 (Mod GRF 1-29) and Ipamorelin work through different mechanisms to boost growth hormone. CJC-1295 is a GHRH analog that tells the pituitary to make more GH, while Ipamorelin is a ghrelin mimetic that triggers GH release pulses. They are most commonly used together as a stack for synergistic GH elevation — the combination produces significantly more GH than either alone.
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Side-by-Side Comparison
| Aspect | CJC-1295 | Ipamorelin |
|---|---|---|
| dosing | 100-300 mcg SubQ 2-3x daily (no DAC) or 300-1000 mcg 1-2x weekly (with DAC) | 200-300 mcg SubQ 2-3x daily, typically before bed and/or post-workout |
| best for | Sustained GH elevation, anti-aging, body composition (especially with DAC version) | Clean GH pulses, sleep improvement, fat loss, recovery — fewest side effects of any GH peptide |
| stacking | The gold standard GH peptide stack. CJC-1295 amplifies the GH production pipeline while Ipamorelin triggers precise release pulses. Typical stack: CJC-1295 (100 mcg) + Ipamorelin (200 mcg) combined injection, 2-3x daily. | — |
| mechanism | GHRH analog — stimulates GH synthesis and secretion from somatotroph cells | Ghrelin receptor (GHS-R) agonist — triggers GH release pulse without affecting cortisol or prolactin |
| fda status | Not FDA-approved; research peptide | Not FDA-approved; research peptide |
| side effects | Head rush/flushing after injection, water retention (especially DAC version) | Minimal — occasional transient head rush, rarely any other side effects |
| hormonal effects | Increases GH and IGF-1; does not significantly affect cortisol or prolactin | Increases GH only — uniquely selective, no cortisol, prolactin, or appetite increase |
Verdict
Best used together as a stack. If choosing one: Ipamorelin for cleaner, gentler GH elevation with minimal sides; CJC-1295 for stronger sustained GH support. The combination outperforms either alone.