Ipamorelin + CJC-1295: Growth Hormone Secretagogue Research
PeptaBase Research Review | 2026-02-18
Why These Two Are Studied Together
Ipamorelin and CJC-1295 work on different growth hormone controls. Together they produce bigger, longer GH pulses than alone.
Here's how GH release works: GHRH from the brain tells the pituitary to release GH. Somatostatin says "stop." Ghrelin (another hormone) also tells the pituitary to release GH. CJC-1295 works the GHRH pathway. Ipamorelin works the ghrelin pathway. Combined, they hit two different buttons at once.
Ipamorelin: Selective Ghrelin Mimicry
Ipamorelin is a 5-amino-acid synthetic peptide that activates ghrelin receptors. The cool thing: it's selective. Unlike older GH drugs (GHRP-6, GHRP-2), it doesn't jack up cortisol or prolactin. You just get the GH spike without the side hormones.
Half-life: about 2 hours. So it triggers one burst of GH at injection time, not a sustained elevation.
CJC-1295: Long-Acting GHRH Boost
CJC-1295 is GHRH (the brain's GH-releasing signal) engineered to last much longer. Native GHRH dies in 7 minutes. CJC-1295 with DAC (the albumin-bound version) lasts 6-8 days. Without DAC, it lasts about 30 minutes.
By keeping GHRH signaling alive for days, CJC-1295 raises the baseline of GH pulses. But it doesn't flatten the pulse-it makes peaks bigger, which is more natural than constant GH.
Why The Stack Works
Two actions at once:
1. CJC-1295 primes the pituitary with sustained GHRH signaling 2. Ipamorelin triggers an acute GH spike at injection time
Result: bigger GH pulses than either alone, and they stay pulsatile (like natural GH), not flat (like GH injections). The pulsatile pattern matters-it affects how your body uses the GH differently than constant high GH.
Protocol Observations from Research Literature
Most protocols time Ipamorelin before sleep (when natural GH peaks) or fasted. CJC-1295 with DAC is dosed once or twice weekly. CJC without DAC pairs with Ipamorelin at the same time.
Typical cycles: 8-12 weeks on, followed by off-time. Some studies use IGF-1 to measure GH axis response.
Evidence Level
Nobody's done a rigorous trial of this combo. The evidence is from single-compound studies and observational reports. Be cautious about protocol claims.
--- For research use only. Not medical advice.