Ipamorelin

Mechanism

Ipamorelin is a selective growth hormone secretagogue that binds the GHS-R1a (ghrelin) receptor on pituitary somatotrophs and triggers pulsatile GH release. Its defining characteristic is receptor selectivity: unlike GHRP-6 or GHRP-2, ipamorelin produces minimal cortisol and prolactin elevation at therapeutic doses, making it the cleanest GHRP available for extended cycles. The GH pulse generated is dose-dependent and time-limited — half-life is approximately 2 hours, meaning the pulse is gone within a few hours of the injection, preserving normal inter-pulse architecture.

Ipamorelin works through a complementary mechanism to GHRH analogs. A GHRH (CJC-1295 DAC, sermorelin) raises the ceiling on the pituitary's GH output capacity; ipamorelin is what actually pulls the trigger. The combination produces pulses significantly larger than either compound alone — this synergy is the rationale for every standard GH-axis protocol. Ipamorelin alone is a viable protocol, but pairing it with a GHRH is noticeably more effective.

The receptor selectivity is not just a safety note — it means ipamorelin cycles can run longer than GHRP-6 or GHRP-2 cycles before receptor fatigue or cortisol-driven side effects accumulate. For most users, ipamorelin is the first GHRP to try and the default GHRP for any goal where appetite manipulation is not explicitly wanted.

Typical protocol

• Starter: 200 mcg SC 2×/day (fasted morning + pre-bed).
• Advanced: 250 mcg SC 3×/day (fasted AM, post-workout, pre-bed). Paired with a GHRH at each dose.
• Cycle length: 8–12 weeks on / 4 weeks off.
• Reconstitution: 5 mg vial + 2 mL BAC water → 2.5 mg/mL. 10 IU on a U-100 insulin syringe = 0.1 mL = 250 mcg.

Who it's for

Muscle growth (recomp), recovery, and lean-mass preservation during cuts. First-choice GHRP for most users because the clean side-effect profile supports longer cycles and does not interfere with cut-phase nutrition discipline. Appetite impact is mild and manageable, unlike GHRP-6.

Stacks well with

• cjc 1295 dac 2mg — mandatory GHRH pairing (DAC variant for once-weekly convenience). CJC raises the pulse ceiling, ipamorelin triggers clean pulses against it.
• sermorelin 2mg — alternative GHRH pairing (short-acting, pulses only when injected — lower receptor downregulation risk on long cycles).
• recomp stack cjc ipamorelin aod — pre-bundled recomp stack.

Watch-outs

• MUST be dosed fasted — food in the stomach, especially carbs, blunts or eliminates the GH pulse. Allow at least 30 minutes fasted before and 30 minutes after each injection before eating.
• Mild appetite stimulation exists but is far milder than GHRP-6. Plan meals if dosing 3×/day.
• Do NOT stack another GHRP at the same pulse timing (e.g. ipamorelin + GHRP-6 together at the same injection) — they compete for the same receptor; the second dose contributes little and the cortisol burden from GHRP-6 is added with minimal GH upside.