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Ipamorelin for Muscle Growth: What the Evidence Shows

What human and animal studies show about Ipamorelin for muscle growth, how strong that evidence is, and what is still unproven.

Medical review pendingGHRP (ghrelin receptor agonist)Updated
Strongest evidence
Animal
Human studies
1
PubMed records, our ledger
Animal studies
1
PubMed records, our ledger
Studies we summarised
4
with an outcome for muscle growth

Evidence for muscle growth

Each row is an outcome related to muscle growth from a published study, strongest design first. Animal and cell results are labelled and are not human results. User reports are not counted as evidence here.

Ipamorelin for muscle growth: outcomes in published studies
OutcomeResultStudy typeSource
Regulatory status and evidence for physique claimsThe review notes no regulatory approval for physique- or performance-related indications of these peptides, including ipamorelin.ReviewFrontiers in endocrinology 2026, PMID 42395176
Muscle strength and bone formation under glucocorticoidAdding ipamorelin to glucocorticoid increased calf-muscle tetanic tension and raised periosteal bone formation four-fold versus glucocorticoid alone.Animal · rat (not a human result)Growth hormone & IGF research 2001, PMID 11735244
Body weight and bone mineral contentIpamorelin, another GHRP and GH all increased body weight and bone mineral content versus vehicle; BMC per body weight was unchanged.Animal · rat (not a human result)The Journal of endocrinology 2000, PMID 10828840
Bone growth and body weightLongitudinal bone growth rose dose-dependently from 42 microm/day (vehicle) to 44, 50 and 52 microm/day, with dose-dependent body weight gain.Animal · rat (not a human result)Growth hormone & IGF research 1999, PMID 10373343

PubMed records for Ipamorelin and muscle growth: 1 human, 1 animal (search counts, not studies we reviewed). Grades follow our .

How strong is it?

Strongest evidence:Animal evidence, 2 of 4Growth hormone & IGF research 2001, PMID 11735244

A human randomized trial outweighs any number of animal studies. Animal and cell results show a mechanism worth testing, not that it works in people.

What exercise and fitness mean

MedlinePlus defines exercise as anything that gets your body moving.[5]

The closest measured outcomes

In rats treated with a glucocorticoid, adding ipamorelin increased maximum tetanic tension of the calf muscles. This is rat data, and it is the closest muscle-function result on file.[2]

In adult female rats given ipamorelin, body weight and total tibial and vertebral bone mineral content rose against vehicle controls.[3]

In rats, ipamorelin raised the longitudinal bone growth rate from 42 to 52 microm/day at the highest dose.[4]

What people were studied

The only human efficacy trial treated postoperative ileus after bowel resection and measured time to a tolerated meal, not muscle.[6]

A narrative review ranks these peptides into evidence tiers running down to a complete absence of human studies.[1]

Other peptides people research for muscle growth

CJC-1295CJC-1295 + IpamorelinSermorelinEnclomipheneHGHTirzepatideIGF-1 LR3hCG
All peptides for muscle growth, compared

Common questions

Does Ipamorelin help with muscle growth?

The strongest study we summarise for muscle growth is animal evidence, across 4 studies with an outcome for muscle growth. That is not proof it works in people.

Is Ipamorelin approved for muscle growth?

No. Ipamorelin is not FDA approved for any use, including muscle growth.

What is the best peptide for muscle growth?

There is no single answer. Our muscle growth overview compares each candidate by evidence grade and legal status rather than by popularity.

Does ipamorelin build muscle?

No human study cited here measured muscle growth; the muscle-function result is from rats, where ipamorelin offset a glucocorticoid-induced fall in muscle strength.[2]

More on Ipamorelin

DosageDoses used in published studies, with the source for each.CalculatorVial, water and dose to syringe units.Side effectsWhat labels and studies report, and what is unknown.ResultsStudy outcomes and when they were measured.BenefitsClaimed benefits next to what published studies measured.How it worksTarget, mechanism and how long it acts, from the label or studies.

Sources

  1. 1The 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
  2. 2The growth hormone secretagogue ipamorelin counteracts glucocorticoid-induced decrease in bone formation of adult rats.Growth hormone & IGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society · 2001PMID 11735244Accessed 2 Oct 2026
  3. 3The GH secretagogues ipamorelin and GH-releasing peptide-6 increase bone mineral content in adult female rats.The Journal of endocrinology · 2000PMID 10828840Accessed 2 Oct 2026
  4. 4Ipamorelin, a new growth-hormone-releasing peptide, induces longitudinal bone growth in rats.Growth hormone & IGF research : official journal of the Growth Hormone Research Society and the International IGF Research Society · 1999PMID 10373343Accessed 2 Oct 2026
  5. 5Official web pageOfficial web page · web page
  6. 6Prospective, 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

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