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Ipamorelin

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Selective Receptor Research Peptide.

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Ipamorelin is a selective pentapeptide growth hormone secretagogue that acts as a ghrelin receptor (GHS-R1a) agonist, investigated for its specificity toward GH release without significant co-stimulation of cortisol or prolactin pathways. Laboratory researchers study its receptor activation kinetics and downstream pituitary signaling in comparison to other GHRPs, using in vitro pituitary cell preparations and preclinical animal models. Its selectivity profile makes it a valuable tool compound for dissecting the ghrelin/GHS axis in endocrine research settings. Supplied as a lyophilized pentapeptide of high analytical purity for laboratory research use only. Reconstitute with bacteriostatic water under sterile conditions.

Why you'll like it
  • 5mg vial
  • High-purity research compound
  • Stable lyophilized powder
  • For laboratory use only
≥99%
HPLC purity
Certificate of analysis
Third-party tested. Every batch.

Independently verified by Freedom Diagnostics via HPLC and mass spec. Every vial carries a unique accession number you can look up directly with the lab.

Verify COA · Freedom Diagnostics
In every order
Peptide vial(s)
Alcohol prep pads
Storage and handling guide
Shipping & returns
  • 2-day shipping nationwide, flat $12.50
  • Plain, discreet packaging. No product names on the outside.
  • Tracking emailed the moment your order ships.
Form
Lyophilized powder
Molecular Formula
C38H49N9O5
Molar Mass
711.85 g/mol
CAS Number
170851-70-4
Overview

About Ipamorelin

Ipamorelin is a synthetic pentapeptide growth hormone secretagogue (GHS) that selectively activates the growth hormone secretagogue receptor (GHSR-1a, also known as the ghrelin receptor). It was developed as a research tool to investigate the pituitary growth hormone axis with a high degree of receptor selectivity, distinguishing it from earlier GHS compounds that also stimulated ACTH and cortisol secretion.

In preclinical research, ipamorelin has been studied for its effects on pulsatile growth hormone release, its interactions with the hypothalamic-pituitary axis, and the downstream signaling cascades initiated by GHSR-1a activation. Its selectivity profile makes it particularly useful for researchers seeking to isolate GH-axis effects without confounding corticotroph stimulation.

Ipamorelin is a research compound used exclusively in laboratory settings. It is not approved for human therapeutic use, and all work involving this peptide must be conducted under appropriate institutional and regulatory oversight.

Ordering & shipping

Buy Ipamorelin online

Ipamorelin is in stock and available to buy online from Optimum ReGen Peptides — a real American research-peptide company with a physical storefront in Medford, Oregon, not an anonymous overseas dropshipper. Priced from $45, every order ships within two business days, flat $12.50 nationwide, in plain discreet packaging with tracking.

As your Ipamorelin supplier we back every batch with a third-party certificate of analysis and compound in a licensed US 503A pharmacy. Vials are supplied lyophilized at analytical purity for laboratory and research use only, not for human consumption.

Research context

Researched For

01
Growth hormone secretagogue receptor (GHSR) pharmacology

Ipamorelin is used in binding and functional assays to study GHSR-1a receptor activation, downstream cAMP and calcium signaling, and receptor desensitization kinetics in pituitary cell models.

02
Pulsatile GH release studies

In animal models, researchers have studied how ipamorelin administration affects the amplitude and pattern of endogenous growth hormone secretory pulses, contributing to understanding of GHS pharmacodynamics.

03
IGF-1 axis research

Studies have examined the relationship between GHSR-1a stimulation by ipamorelin and subsequent liver IGF-1 production in rodent models, providing data on the pituitary-liver signaling axis.

04
Bone and muscle tissue research

Preclinical investigations have explored how repeated GHSR agonism influences markers of bone mineral density and lean tissue in animal models of aging or metabolic challenge.

05
Selectivity profiling versus other secretagogues

Research has compared ipamorelin to GHRP-2 and GHRP-6 to characterize the differences in ACTH/cortisol co-stimulation, establishing ipamorelin as a selective GHS tool compound.

Methodology

How It Is Studied

In pituitary cell culture assays, ipamorelin is applied at nanomolar concentrations to assess GH secretion via radioimmunoassay or ELISA. Selectivity against ACTH secretion is measured in parallel corticotroph preparations, establishing the compound's functional specificity profile.

In vivo rodent studies typically involve subcutaneous administration with serial blood sampling to characterize the GH secretory pulse. Pharmacokinetic/pharmacodynamic modeling is used to relate plasma ipamorelin concentrations to GH release profiles across dosing intervals.

Molecular studies use GHSR-1a-transfected cell lines to measure receptor binding affinity (Ki), functional cAMP accumulation, and beta-arrestin recruitment in order to understand ipamorelin's signaling bias relative to native ghrelin.

Technical sheet

Specifications

Technical data sheetResearch grade
FormLyophilized powder
Purity>= 99% (HPLC)
Molecular FormulaC38H49N9O5
CAS Number170851-70-4
SequenceAib-His-D-2-Nal-D-Phe-Lys-NH2
Molar Mass711.85 g/mol
For research use only. Not for human consumption.
Storage protocols

Storage & Handling

Store lyophilized ipamorelin at -20 C or below, protected from moisture and light. The lyophilized form is stable under these conditions for extended periods. Once reconstituted in bacteriostatic water or sterile saline, store at 4 C for short-term use (up to 2-4 weeks based on published stability data) or aliquot and store at -80 C for longer retention. Minimize freeze-thaw cycles, which can promote peptide aggregation. Document all reconstitution and storage conditions per laboratory quality standards.

FAQ

Frequently Asked Questions

How does ipamorelin differ from GHRP-6 in research selectivity?+
Both are GHSR-1a agonists, but GHRP-6 and GHRP-2 also stimulate ACTH and cortisol secretion at effective concentrations. Ipamorelin was developed specifically to minimize these off-target effects, making it a more selective tool for isolated GH axis studies.
What receptor does ipamorelin bind?+
Ipamorelin acts at the growth hormone secretagogue receptor 1a (GHSR-1a), the same receptor that endogenous ghrelin activates. It functions as a full agonist at this receptor in in vitro and preclinical model systems.
Is ipamorelin the same as ipamorelin/CJC-1295 blend products?+
No. Ipamorelin alone is a single pentapeptide. Combination research preparations pair it with CJC-1295 (a GHRH analogue) to study simultaneous GHSR and GHRHR stimulation. This product contains ipamorelin only.
What is the typical research concentration range for ipamorelin in cell studies?+
In vitro GH secretion assays typically use ipamorelin in the 0.1 to 100 nM range to establish concentration-response relationships at GHSR-1a in pituitary cell models.
How stable is ipamorelin after reconstitution?+
Published stability studies suggest reconstituted solutions in bacteriostatic water retain activity for several weeks at 4 C, though individual laboratory conditions (buffer pH, freeze-thaw history) can affect this. Researchers should validate stability for their specific assay conditions.
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Research library

Ipamorelin research guides