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Fitness & muscle

Ipamorelin

One of the most selective growth hormone secretagogues available. It stimulates GH release without the cortisol, prolactin or appetite spikes of older GHRPs, and is almost always paired with a GHRH analog like CJC-1295/Mod-GRF.

Research chemical Fitness & muscle

Reviewed 2026-09-12
Full name
Ipamorelin (a Growth Hormone Releasing Peptide / GHRP)
Also known as
NNC 26-0161
Regulatory status
Research chemical, not FDA-approved for any indication.

Origin

A pentapeptide developed in the 1990s specifically to be a more selective ghrelin-receptor agonist than earlier growth hormone releasing peptides like GHRP-6 or Hexarelin.

Mechanism

Binds the ghrelin/growth hormone secretagogue receptor in the pituitary, triggering release of stored growth hormone. Its selectivity means it does this without meaningfully raising ACTH, cortisol, prolactin, or other pituitary hormones that earlier-generation GHRPs also stimulate, the main reason it largely replaced GHRP-6 and GHRP-2 in self-experimentation use.

Research summary

Evidence

Preclinical and early pharmacology studies established its GH-releasing selectivity and potency relative to older GHRPs, but like CJC-1295, no large-scale modern human efficacy trial exists for the doses and chronic use patterns common in self-experimentation. The broader GH-axis literature (physiological GH pulses, collagen synthesis, body composition) is used to infer likely effects, but this is extrapolation, not direct trial evidence for Ipamorelin at self-administered doses.

Evidence tier: Research chemical — see the methodology note for how this is assessed.

Citations

Reported benefits

  • Improved sleep depth/quality, widely reported and consistent with GH's normal physiological role in sleep
  • Improved recovery from training
  • Modest reported improvements in body composition (more fat loss, better muscle retention) over months of consistent use combined with training
  • Considered gentler / fewer side effects than older GHRPs like GHRP-6, notably without the strong hunger-stimulating effect GHRP-6 is known for

Dosing protocols reported in the literature & community

These are protocols reported by compounding pharmacies, published trials, or self-experimentation communities — not a prescription. Start low, especially for anything new.

Reported dosing protocols
RouteReported protocol
Subcutaneous injection, paired with a GHRH analogA commonly cited compounding-pharmacy protocol is 200 mcg once daily, 5x/week, paired with Mod-GRF/CJC-1295. Some self-experimenters use up to 200-300 mcg, up to 3x/day spaced 4+ hours apart. A more conservative, cost-effective approach favored by parts of the harm-reduction community caps doses around 100-125 mcg, arguing that higher doses increase GH release only marginally further.
TimingSame fasted-state, pre-bed and/or on-waking timing logic as CJC-1295/Mod-GRF — insulin can blunt the GH pulse, so injecting away from meals is standard advice.

Side effects

  • Allergic-type reactions have been anecdotally reported, though generally considered rare and more associated with high doses or with the co-administered GHRH
  • Mild injection-site reactions
  • Water retention / mild joint discomfort possible as part of the general GH-axis effect
  • Users are advised to start at a low dose specifically to screen for individual reaction sensitivity before committing to a regular protocol

Safety notes

Safety: Considered one of the gentler GH secretagogues by the self-experimentation community, but gentler than GHRP-6 is a relative, community-derived judgment, not a conclusion from controlled human trials. As with CJC-1295, start low and watch for flushing, itching or palpitations as a signal to reduce dose.
Community & reddit notes (anecdotal — not clinical evidence)

The default GHRP choice in most modern GH-secretagogue stacks, almost always paired with CJC-1295/Mod-GRF. Sleep quality improvement is the most consistently and confidently reported effect, more so than body-composition change, which users describe as modest and cumulative over months.

Used in stacks

Community combinations that include Ipamorelin — see each stack page for the combination-specific rationale and evidence.

Mixing compatibility

Pulled from a community-charted mixing-compatibility reference (anecdotal, clinic-use, and community-reported signals) — not a safety guarantee. Verify independently before combining anything.

Used together in wellness-clinic protocols

Reported as a combination to avoid