Ipamorelin is a growth-hormone-releasing peptide (a selective GHRP) studied for stimulating growth hormone release with a comparatively low reported effect on cortisol and appetite versus older-generation GHRPs like GHRP-6.
Benefits
Ipamorelin is a synthetic pentapeptide that acts as an agonist at the ghrelin receptor (GHSR-1a) in the pituitary, stimulating GH release.
Selectivity — animal studies: released GH with potency comparable to GHRP-6, but — unlike GHRP-6 and GHRP-2 — did not significantly raise ACTH or cortisol, even at doses 200x higher than its effective GH-releasing dose. Described as "the first GHRP-receptor agonist with a selectivity for GH release similar to that displayed by GHRH." Raun et al., Eur J Endocrinol, 1998
This selectivity — GH release without the cortisol/prolactin/ACTH elevation seen with other GH secretagogues — is ipamorelin's central differentiator, well-supported here in animal data.
Dosage
Real human dosing data exists, but via IV administration, not the subcutaneous route most people actually use. A Phase 1 dose-escalation trial (40 healthy volunteers) tested five ascending IV doses over 15 minutes: 0.003, 0.01, 0.03, 0.06, and 0.1mg/kg. Maximum GH response was reached at 0.06mg/kg — higher doses didn't produce a proportionally larger peak. Gobburu et al., Pharm Res, 1999
A separate Phase 2 trial (117 subjects) used IV doses in the 0.01-0.1mg/kg range with reported "excellent tolerability." No subcutaneous human dosing trial was found.
Reconstitution
Standard reconstitution math applies for the vial size actually sold.
Side Effects
The Phase 1 IV trial (n=40) reported no adverse events. A Phase 2 IV trial (n=117, tested for postoperative ileus recovery) reported "excellent tolerability" — this trial didn't show a significant efficacy benefit over placebo for its actual target endpoint (bowel-function recovery after surgery), which is an efficacy result specific to that GI-motility use case, not a finding against ipamorelin's GH-related effects. The animal selectivity data (no cortisol/ACTH/prolactin elevation) is itself a safety-relevant finding distinguishing ipamorelin from GHRP-2/GHRP-6/Hexarelin.
Results Timeline
From real human PK/PD data: a single IV dose produces GH that peaks at ~40 minutes post-dose, then declines to negligible levels within roughly 6 hours — a single-pulse pattern, not a sustained multi-day elevation (unlike CJC-1295 with-DAC). No data was found on how this single-dose pulse pattern translates to repeated daily/twice-daily subcutaneous dosing over weeks.
How is Ipamorelin different from GHRP-6?+
Both stimulate growth hormone release, but Ipamorelin is described in research as more selective, with less reported impact on cortisol and hunger than GHRP-6.
Is Ipamorelin legal?+
It is not FDA-approved for human use and is prohibited under WADA as a growth-hormone-releasing peptide.
What is Ipamorelin commonly stacked with?+
It is most often discussed alongside CJC-1295, on the premise that combining a GHRP with a GHRH analogue produces a larger combined growth hormone pulse than either alone.
Is Ipamorelin okay to use on its own?+
Yes — it's considered one of the milder, more selective growth hormone secretagogues, and used alone it still triggers a real natural GH pulse without meaningfully spiking cortisol or prolactin the way some other GHRPs do. The caveat isn't whether it works alone — it does — it's that it lacks FDA approval for human use and long-term safety data is still limited. Most protocols pair it with CJC-1295 to extend the pulse further, but going solo is a legitimate, milder option on its own.
What's a commonly used dosage and protocol?+
One frequently referenced protocol: CJC-1295, 200mcg, three times daily; Ipamorelin, 300mcg, three times daily; or Sermorelin, 300mcg, before bed if that's the GHRH analog being used instead. Results are hard to isolate from diet and training, since both affect body composition heavily alongside any peptide — bloodwork before and during a protocol is the most reliable way to see what's actually changing.
If stacked with Ipamorelin, Sermorelin, and CJC-1295, should you mix all three or take separately?+
Not advised to combine them in one syringe — each peptide can sit at a different pH and buffering level, so mixing them together risks degrading one or more of them rather than saving a step.
Does Ipamorelin affect sleep?+
If anything, it runs the opposite way people sometimes expect — taken before bed, it triggers a GH pulse that lines up with your body's natural slow-wave deep sleep cycle, and many people report deeper sleep and better recovery within the first one to two weeks. If you are having sleep trouble on a stack, it's more likely a lifestyle/routine issue, or a paired compound — a hunger-suppressing peptide like Retatrutide, for instance, can cause secondary digestion issues that disrupt sleep — rather than Ipamorelin itself.
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