Ipamorelin
Ipamorelin
The “clean” growth-hormone pulse — a selective ghrelin-mimetic that nudges your own GH up without dragging cortisol or prolactin along with it. In practice it’s almost never run alone: it’s the trigger half of the CJC-1295 + Ipamorelin stack.
What it is
Prompts your pituitary to release a pulse of your own growth hormone, rather than injecting GH itself. People run it for sleep — by far the loudest reported benefit — along with recovery, lean mass, and the slow body-recomposition that comes with raised GH/IGF-1.
Its selling point is selectivity: it triggers the GH pulse without the cortisol and prolactin spikes that older, cruder secretagogues caused. That “clean” framing is a genuine community theme, not just marketing. The catch is that almost no one runs it solo — the whole conversation is about pairing it with CJC-1295 in a single bedtime pin.
Mechanism
Mimics ghrelin at the GH-secretagogue receptor in the pituitary, triggering a pulse of growth hormone and briefly suppressing somatostatin (the brake on GH release). Where a GHRH analog like CJC-1295 raises how much GH comes out per pulse, Ipamorelin triggers the pulse itself — which is exactly why the two are stacked.
Step 1 · the setup
Before bed, on an empty stomach.
Timing is the whole game. Food blunts the response, and GH naturally pulses at night — so the standard protocol is a fasted bedtime pin to ride your own rhythm.
Step 2 · the target
It heads for the pituitary.
Ipamorelin doesn’t add growth hormone to your blood. It travels to the pituitary — the gland that makes your own GH — and goes looking for one specific receptor.
Step 3 · the disguise
It mimics ghrelin and docks in.
It’s a ghrelin mimic: it fits the GH-secretagogue receptor, the same one your “hunger hormone” uses. Docking there is the signal that tells the gland to act.
Step 4 · release the brake
It lifts the brake on GH.
Your body keeps GH in check with somatostatin — a brake. Ipamorelin briefly eases that brake off, clearing the way for a release.
Step 5 · the pulse
The pituitary fires a pulse of your own GH.
This is the key move: it triggers the pulse itself. (Its partner CJC-1295 makes each pulse bigger — Ipamorelin is what sets one off.)
Step 6 · the clean part
And only GH — nothing else tags along.
Its selling point is selectivity. Cruder secretagogues also spiked cortisol and prolactin; Ipamorelin leaves those channels alone. That’s the “clean pulse” people mean.
Step 7 · it lands
The pulse travels out to the body.
The GH wave moves into circulation and, via IGF-1, reaches muscle and tissue — the downstream of a natural pulse, just prompted on purpose.
The result
Better sleep, recovery, slow recomposition.
Deeper sleep is the loudest reported benefit, with recovery and lean-mass gains over time. This is lived community dosing, not trial data — and it’s near-always run with CJC-1295, not alone.
Lived community dosing, not human trial data — Ipamorelin is near-always run with CJC-1295.
Standard dose
| Standard dose | ~200–300 mcg / injection (proposed — pending dosing review)community |
|---|---|
| Timing | Before bed, on an empty stomach — food blunts the GH pulsecommunity |
| Frequency | 1–3× / day; once nightly is the common minimal protocolcommunity |
| Cycle | ~8–12 weeks, then a breakcommunity |
Reconstitution calculator
U-100 · 100u = 1 mL= 200 units
Set the vial size and water to match your product — amounts vary by supplier. This is unit-conversion math, not medical advice or a dosing recommendation.
Pushing higher— going beyond the standard dosecommunity
Side effects & cautions
Mild and uncommon in community use: a bump in hunger (it’s a ghrelin mimetic, so this is expected), injection-site reactions, some water retention, occasional headache or flushing, and a carpal-tunnel-type tingling that tracks with elevated GH. Lethargy is reported by a minority. Nothing here rises to the theoretical cancer caution that follows the repair peptides — but raising GH/IGF-1 isn’t free, so it’s not for anyone with active cancer concerns.
Stacking
The canonical pairing is CJC-1295 — run them together in a single pin at night, fasted. CJC (a GHRH analog) raises how much GH each pulse releases; Ipamorelin triggers the pulse and lifts the somatostatin brake. They hit different levers, which is why the combination is near-universal and either one alone is considered half the protocol.
Evidence & sources
The human trials confirm Ipamorelin raises GH cleanly and is well-tolerated — but the one efficacy RCT (postoperative ileus) failed its endpoints, and there are no body-composition, recovery, or sleep trials in healthy users. Those uses rest on animal data and anecdote.
- Beck DE et al. (2014)Human RCTRCT of ipamorelin for postoperative ileusInt J Colorectal Dis — Phase 2 RCT (failed endpoints)PMID 25331030 ↗
- Gobburu JVS et al. (1999)Human studyPK-PD modeling of ipamorelin in healthy volunteersPharm Res — human PK/PDPMID 10496658 ↗
- Raun K et al. (1998)Animal / in-vitroIpamorelin, the first selective growth hormone secretagogueEur J Endocrinol (animal characterization)PMID 9849822 ↗
- Johansen PB et al. (1999)Animal / in-vitroIpamorelin induces longitudinal bone growth in ratsGrowth Horm IGF Res (animal)PMID 10373343 ↗