Ipamorelin Research Overview

An overview of ipamorelin, a synthetic growth hormone secretagogue, and its mechanism of action in research.

Scientific background / literature overview only. Discussion of published research does not describe the intended use of Novex Peptide products.

Novex Peptide Research Team31 July 2026 7 min read

ipamorelin GHS growth hormone secretagogue ghrelin receptor

Introduction

Ipamorelin is a synthetic pentapeptide that functions as a selective growth hormone secretagogue. It stimulates the release of endogenous growth hormone through a mechanism distinct from GHRH analogues, making it a valuable tool in endocrine and metabolic research.

Mechanism of Action

GHS Receptor Agonism

Ipamorelin binds to the growth hormone secretagogue receptor (GHS-R1a, also known as the ghrelin receptor), stimulating growth hormone release from the anterior pituitary.

Selectivity

Unlike earlier secretagogues such as GHRP-6, ipamorelin is noted for its selectivity — it stimulates GH release with minimal effects on ACTH, cortisol, prolactin, or other pituitary hormones in animal studies.

Pulsatile GH Release

Ipamorelin preserves the pulsatile pattern of GH release, which is physiologically relevant for research models.

Current Research

Growth Hormone Research

Animal studies have used ipamorelin to investigate the effects of pulsatile GH release on body composition, bone density, and metabolic parameters.

Combination Research

Research has explored combining ipamorelin with GHRH analogues (such as CJC-1295) to study synergistic effects on GH release.

Gastrointestinal Research

As a ghrelin receptor agonist, ipamorelin has been used in studies investigating ghrelin's role in appetite regulation and gastrointestinal function.

Chemical Properties

**Sequence:** Aib-His-D-2-Nal-D-Phe-Lys-NH2 (5 amino acids)

**Molecular formula:** C38H49N9O5

**Molecular weight:** 711.85 g/mol

**Modification:** C-terminal amidation, contains non-natural amino acid Aib (α-aminoisobutyric acid)

Storage Considerations

Store lyophilised ipamorelin at -20°C.

Protect from light and moisture.

Reconstituted solutions should be aliquoted and stored at -20°C.

Testing Methods

Ipamorelin batches should be verified by:

RP-HPLC for purity (≥98% recommended)

Mass spectrometry for identity confirmation

Research Limitations

Ipamorelin is supplied for in vitro laboratory research and animal model studies only. Most published research is from animal models. No clinical trials have confirmed efficacy in humans for the applications described. No medical, therapeutic, or dosing claims are made. Ipamorelin is not approved for human therapeutic use by any regulatory authority.

References

1.Raun K, et al. Ipamorelin, a New GHS. Eur J Endocrinol. 1998;139(5):552-561.
2.Bowers CY. Growth Hormone Releasing Peptides. Endocrine. 2018;61(1):8-16.
3.Patchett AA, et al. Design of GHS. Proc Natl Acad Sci. 1995;92(15):7001-7005.

Research use only. This article is for educational purposes only and does not constitute advice for any application involving human use. No medical claims are made.