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Does ipamorelin work?

For a clinical outcome, no: the phase 2 randomised trial in bowel-resection patients found no significant differences from placebo in its key or secondary efficacy analyses.

GHRP (ghrelin receptor agonist)Updated

Short answer

For a clinical outcome, no: the phase 2 randomised trial in bowel-resection patients found no significant differences from placebo in its key or secondary efficacy analyses.[1]

As a hormone effect, yes: a pharmacokinetic-pharmacodynamic study found ipamorelin produced a single short episode of growth hormone release that peaked at 0.67 hours and then declined.[2]

Animal work and approval

Rat and swine work described ipamorelin as releasing growth hormone with a selectivity similar to GHRH. This is animal data.[3]

A review of performance-enhancing peptides notes there is no regulatory approval for physique or performance uses, so those claims are not backed by an approved indication.[4]

More questions on Ipamorelin

Does ipamorelin increase appetite?

More on Ipamorelin

ResultsStudy outcomes and when they were measured.Ipamorelin overview

Sources

  1. 1Prospective, randomized, controlled, proof-of-concept study of the Ghrelin mimetic ipamorelin for the management of postoperative ileus in bowel resection patients.International journal of colorectal disease · 2014PMID 25331030Accessed 2 Oct 2026
  2. 2Pharmacokinetic-pharmacodynamic modeling of ipamorelin, a growth hormone releasing peptide, in human volunteers.Pharmaceutical research · 1999PMID 10496658Accessed 2 Oct 2026
  3. 3Ipamorelin, the first selective growth hormone secretagogue.European journal of endocrinology · 1998PMID 9849822Accessed 2 Oct 2026
  4. 4The emerging landscape of performance-enhancing peptides modulating GH-IGF1 axis: bridging the gap between clinical evidence and patient self-administration.Frontiers in endocrinology · 2026PMID 42395176Accessed 2 Oct 2026

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