What the studies show
Median time to tolerate a solid meal 25.3 h vs 32.6 h on placebo — not statistically significant (p=0.15). No difference on secondary endpoints. Phase 3 was not pursued.
A few small or poorly-controlled human studies. Enough to be interesting; not enough to count on. Most of what gets called “clinically proven” online lives here.
- 1Beck DE, Sweeney WB, McCarter MD, et al. Prospective, randomized, controlled, proof-of-concept study of the ghrelin mimetic ipamorelin for the management of postoperative ileus in bowel resection patients.Int J Colorectal Dis, 2014;29:1527–1534117 patients; primary endpoint not met (p=0.15).
In context
Ipamorelin is a synthetic five-amino-acid peptide that stimulates growth-hormone release with little effect on cortisol or prolactin. Small early studies confirmed the hormone release; the only randomised trial — 117 bowel-surgery patients, testing it for post-operative gut recovery — found no benefit, and development stopped. It is not an approved medicine anywhere, and the popular claims about muscle, fat loss and sleep have never been tested in a trial.
Ipamorelin is not approved. Legal status differs by country — see the regulation section or the jurisdiction pages.
Questions
Is Ipamorelin proven to help with post-operative ileus?
What studies are behind the grade?
Is Ipamorelin approved for this?
Other outcomes for Ipamorelin
- CGrowth hormone releaseSmall early-phase studies
- DBody compositionNone controlled
- DSleep or recoveryNone
- CSafety in humansadverse1 RCT + early-phase
Reviewed 2 September 2026. Grades count human evidence only; see how LYO grades. Not medical advice. Correct this page →