Ipamorelin side effects: what the studies found
Real adverse event rates, clinical trial discontinuation numbers, and documented safety warnings from peer-reviewed literature.
This page has not yet been reviewed by a credentialed medical professional. It is educational and is not medical advice.
Safety summary: Ipamorelin
- Evidence level Human trials
- FDA approvedNo
- Trial discontinuationPhase 2 postoperative ileus trial (PMID 25331030) showed tolerability similar to placebo, but the trial failed its primary efficacy endpoint.
- WADA sport statusProhibited
In short: In the ileus trial adverse events were common in both groups (87.5% ipamorelin vs 94.8% placebo), largely reflecting surgery. Long-term safety of repeated use for muscle or "anti-aging" has not been studied in controlled trials.
Not an FDA-approved drug for any medical condition. Prohibited in sport under WADA Category S2.
Most common side effects
Reported symptoms in clinical trials and published pharmacology literature:
| Symptom | Reported rate | Clinical context & notes |
|---|---|---|
| Mild headache | Common in clinical studies | Transient, usually resolving within hours. |
| Flushing & lightheadedness | Common | Mild vasodilation occurring shortly after injection. |
| Increased appetite | Mild (much less than GHRP-6) | Acts on the ghrelin receptor, but with greater selectivity than earlier secretagogues. |
| Injection site discomfort | Common | Mild localized stinging or redness. |
Serious risks and warnings
Potential adverse reactions and biological risks identified in research:
- Impaired glucose tolerance: Elevated growth hormone levels can reduce peripheral insulin sensitivity over prolonged periods.
- Water retention & joint discomfort: Transient soft-tissue swelling from elevated GH and IGF-1.
- Unregulated product contamination: Compounded or online research vials carry risks of microbial and endotoxin exposure.
Contraindications
This compound should not be used in individuals with:
- Active cancer
- Pregnancy or nursing
- Athletes subject to anti-doping testing
Common questions about Ipamorelin safety
Does ipamorelin raise cortisol or prolactin?
Unlike GHRP-2 and GHRP-6, clinical pharmacology studies in healthy volunteers (PMID 10496658) showed that ipamorelin is selective for growth hormone and does not significantly elevate ACTH, cortisol, or prolactin at standard doses.
Is ipamorelin safe for long-term anti-aging use?
There are no long-term clinical trials evaluating ipamorelin for anti-aging, fat loss, or muscle gain. Its only human trials were short hospital-based studies for bowel motility after surgery.
Can ipamorelin be detected on sports drug tests?
Yes. WADA specifically lists ipamorelin as a prohibited growth hormone secretagogue (Category S2). Anti-doping laboratories routinely detect ipamorelin and its metabolites using LC-MS/MS.