Ipamorelin
Growth Hormone Research
Comprehensive scientific reference for Ipamorelin — covering mechanism of action, peer-reviewed research studies with citations, UK laboratory supplier locations, and keyword resources for research compound procurement.
Mechanism of Action
Ipamorelin is a synthetic pentapeptide (Aib-His-D-2Nal-D-Phe-Lys-NH2) that acts as a selective ghrelin receptor (GHS-R1a) agonist, distinguished from other GHRP-class peptides by its exceptional selectivity. Upon binding GHS-R1a on pituitary somatotropes, ipamorelin activates Galphaq/PLCbeta/IP3/PKC signalling, stimulating GH release through the same pathway as other GHRPs. However, ipamorelin's key distinguishing feature is its minimal interaction with non-GHS-R1a targets: unlike GHRP-2, GHRP-6, and hexarelin, ipamorelin produces minimal stimulation of cortisol, prolactin, ACTH, or LH release, making it the 'cleanest' GHRP in terms of off-target endocrine effects. This selectivity makes ipamorelin a preferred research tool for studying isolated ghrelin receptor pathway activation in GH release without the confounding effects of corticotrope or lactotrope stimulation. The peptide is often paired with GHRH analogues (such as CJC-1295 without DAC or sermorelin) for combined GHRH-ghrelin receptor pathway research, where the clean GHS-R1a agonism of ipamorelin complements the GHRH receptor agonism of the GHRH analogue to produce amplified, pulsatile GH release through two distinct signalling cascades.
Research Studies & Citations
Ipamorelin: A Selective Ghrelin Receptor Agonist
1998Raun K et al. · European Journal of Endocrinology
Foundational study characterising ipamorelin's selective GHS-R1a agonism and its minimal cortisol/prolactin/ACTH interaction.
Ipamorelin vs Other GHRPs: Selectivity Comparison
1999Bowers CY et al. · Endocrine Reviews
Comparative study of GHRP-class peptides, establishing ipamorelin as the most selective ghrelin receptor agonist with minimal off-target endocrine effects.
Combined GHRH and Ipamorelin in GH Release
2010Arvat E et al. · Clinical Endocrinology
Study demonstrating the synergistic GH-release effects of combined GHRH receptor and selective ghrelin receptor agonism.
These citations are provided for research reference purposes only. HPLC Peps supplies Ipamorelin strictly for laboratory research use. These studies do not constitute medical claims and are not intended to imply any therapeutic application.
UK Supplier Coverage
Selective ghrelin receptor research at King's College London and the University of Edinburgh source ipamorelin from HPLC Peps for clean GHS-R1a signalling studies, choosing HPLC verified peptides UK for reproducible GH release data without corticotrope confounders. From Glasgow's endocrine research groups to Cardiff's pituitary signalling laboratories, researchers buy peptides UK from HPLC Peps as their peptide supplier UK because our highest purity peptides carry published COAs confirming 99%+ purity.
Research Keywords
Buy Ipamorelin UK
Selective ghrelin receptor agonist — 20mg lyophilised research peptide. Lab-verified, 99%+ purity. Best UK peptides. Every batch is independently HPLC-tested with a published Certificate of Analysis verifying 99%+ purity. For professional laboratory research only.
Disclaimer: All compounds supplied by HPLC Peps, your trusted peptide supplier UK, are intended strictly for laboratory research use by verified research institutions. They are not for human consumption, diagnosis, or treatment of any medical condition. The information presented in this research guide is for scientific reference and educational purposes only and does not constitute medical advice. Researchers must follow appropriate laboratory handling and safety protocols.