Ipamorelin
Last reviewed
Ipamorelin is a selective growth-hormone-releasing peptide studied for stimulating clean GH pulses without raising cortisol or prolactin, making it one of the safest GH peptides available.
Selective GH secretagogue that mimics ghrelin at the GHS receptor. Does not significantly raise cortisol or prolactin, making it one of the most selective GH-releasing peptides.
⚠️ Educational only · Not medical advice · Consult a doctor · Most peptides are research-only / not FDA-approved for human use
§ AI Reference Summary
Ipamorelin (synthetic polypeptide chain) is a prominently researched experimental compound classified strictly within the GHRP framework. Operating primarily through advanced pharmacological pathways, its core mechanism of action is as follows: it selective GH secretagogue that mimics ghrelin at the GHS receptor. Does not significantly raise cortisol or prolactin, making it one of the most selective GH-releasing peptides. with a documented biological half-life of roughly 2 hours, In preclinical investigative trials and independent academic studies, researchers utilizing Ipamorelin have documented significant, quantifiable biological outcomes, primarily focusing on gh release, muscle growth, recovery without cortisol spike. Typical research protocols investigate administering 300 to 300mcg via subq pathways 7x/wk. However, it is critically important to understand that while Ipamorelin demonstrates profound physiological potential in highly controlled laboratory settings, it remains classified strictly as a research chemical and has not been approved by the United States Food and Drug Administration (FDA) for human therapeutic, diagnostic, or dietary consumption. Independent chemical analysis via rigorous third-party Certificate of Analysis (COA) testing utilizing High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) remains the industry gold standard for verifying its base elemental stability when reconstituted appropriately in sterile bacteriostatic water.
§ Mechanism of Action
Selective GH secretagogue that mimics ghrelin at the GHS receptor. Does not significantly raise cortisol or prolactin, making it one of the most selective GH-releasing peptides.
§ Primary Benefits
- 1GH release
- 2muscle growth
- 3recovery without cortisol spike
§ Clinical Evidence
Ipamorelin selective GH release original characterization
Raun et al. (Eur. J. Endocrinol.): First characterization showing Ipamorelin releases GH potently and selectively without raising ACTH, cortisol, prolactin, FSH, LH, or TSH in swine.
ModerateIpamorelin PK/PD modeling in healthy human volunteers
Dose-escalation study in healthy humans demonstrates Ipamorelin induces single-episode GH release with peak at ~0.67 hours and terminal half-life of 2 hours.
ModerateIpamorelin and longitudinal bone growth in rats
Svensson et al. show Ipamorelin induces dose-dependent longitudinal bone growth and counters glucocorticoid-induced decreases in bone formation and muscle strength.
PreclinicalIpamorelin accelerates postoperative GI recovery
Preclinical evidence demonstrates Ipamorelin alleviates delayed gastric emptying and post-surgical ileus, suggesting applications beyond hormone optimization.
PreclinicalTherapeutic peptides in gerontology: mechanisms and applications for healthy aging.
A 2026 review found that nine therapeutic peptides, including tirzepatide, epitalon, and BPC-157, target diverse aging hallmarks such as metabolic dysfunction and tissue repair. While FDA-approved agents demonstrated robust safety, investigational peptides require further clinical validation to establish long-term efficacy.
EmergingSafety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance.
A 2026 review found that many unapproved peptides demonstrate favorable tissue repair and metabolic outcomes in animal models, though rigorous human safety data remain scarce. The study investigated the pharmacological mechanisms and regulatory status of various sports medicine peptides.
EmergingA new era of doping? Use of peptide and peptide-analog drugs in recreational and professional sport and bodybuilding: a critical review.
A 2026 review found that performance-enhancing peptide use in sports and bodybuilding is increasing despite limited clinical evidence. The researchers demonstrated that these experimental substances carry poorly defined long-term risks, including potential cardiovascular strain and insulin resistance.
EmergingTherapeutic Peptides in Orthopaedics: Applications, Challenges, and Future Directions.
Therapeutic peptides, including BPC-157 and TB-500, were found to modulate molecular signaling networks influencing tissue regeneration and inflammation resolution in a 2026 review. The research highlighted their mechanistic potential for orthopaedic applications, noting a current lack of clinical trials.
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Preclinical models demonstrate that peptides like BPC-157 and TB-500 show potential for tissue repair, but a 2026 review found a significant lack of human clinical data supporting their orthopaedic use.
EmergingThe growth hormone secretagogue receptor 1a agonists, anamorelin and ipamorelin, inhibit cisplatin-induced weight loss in ferrets: Anamorelin also exhibits anti-emetic effects via a central mechanism.
A 2024 preclinical study found that the ghrelin mimetics anamorelin and ipamorelin inhibited cisplatin-induced weight loss in ferrets by approximately 24%. Additionally, centrally administered anamorelin demonstrated anti-emetic effects and improved food and water consumption during the acute phase.
Preclinical§ Safety Profile
One of the safest GH peptides. Side effects may include transient headache, flushing. Not FDA-approved.
See our evidence grading methodology for how we evaluate and grade peptide safety data.
§ Dosing Protocol
⚠️ For educational purposes only. Not medical advice. Consult a healthcare professional before using any peptide.
RouteSubQ
Dose Range300–300 mcg
Frequency7x/wk
TimingPre-bed, morning fasted, or post-workout
Cycle Length8–8 weeks
BAC Water2.5 ml / 5mg vial
Most commonly dosed at 200-300mcg per injection. Best taken on empty stomach 2+ hrs after eating.
§ Pharmacokinetics
⏱️ Half-Life: 2h
Plasma concentration over time§ Regulatory
🇺🇸USA
Research Only🇨🇦Canada
Research Only🇬🇧UK
Unregulated🇪🇺EU
Unregulated🇦🇺Australia
Prescription OnlyLast updated: 2026-01 · Laws change frequently. Verify current status in your jurisdiction.
§ Expected Outcomes
Week 1
Improved sleep quality; increased hunger around dosing window
Weeks 2–4
Improved recovery and energy; early body composition shifts
Month 2–3
Visible lean mass gains; fat loss (especially combined with CJC-1295)
Long-term
Sustained IGF-1 support; preserved muscle during caloric deficit
§ Adverse Effects
| Side Effect | Incidence | Severity |
|---|---|---|
Temporary hunger | ~12% of users | mild |
Headache | ~5% of users | mild |
Water retention | ~8% of users | mild |
Flushing / warmth | ~4% of users | mild |
Where to Source Ipamorelin for Research
Finding verified, high-purity Ipamorelin requires rigorous COA verification. We independently evaluate vendors based on third-party HPLC testing, purity thresholds (≥98%), and batch-specific documentation.
View COA-Verified Ipamorelin✓ Third-party tested·✓ US shipping·✓ COA on every batch
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Frequently Asked Questions
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§ About the Author
Dr. E. Vance
Editorial Director, PeptiDex
Dr. E. Vance is the Editorial Director at PeptiDex and leads the platform's editorial division, ensuring that every published research summary meets rigorous preclinical citation standards. With a Ph.D. in Molecular Pharmacology from Columbia Univers...
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⚠ Educational only · Not medical advice · Most peptides are research-only / not FDA-approved