Ipamorelin

Ipamorelin is a pentapeptide: a short chain of five amino acids, with a molecular weight of approximately 711.85 g/mol. It belongs to the class of growth hormone secretagogues, molecules that bind to the ghrelin receptor.

Mechanism of action under investigation

What sets Ipamorelin apart in research is its selectivity. Whilst some older secretagogues may also influence other hormones, Ipamorelin is described in the literature as being relatively selective: in research, it targets the release of growth hormone with limited effect on hormones such as cortisol and prolactin. This ‘clean’ mode of action makes it a popular model molecule.

This description relates to the mechanism of action as studied in research and does not constitute evidence of efficacy in humans.

The small size of the pentapeptide makes Ipamorelin easy to synthesise and characterise, which contributes to reproducible research. It is precisely this combination of a small, well-defined structure and high selectivity that explains its popularity as a model molecule.

These properties make Ipamorelin a valuable and widely studied subject in growth hormone research.

Ipamorelin has been extensively studied as a selective growth hormone secretagogue and is used as a reference molecule in many studies precisely because of that selectivity.

• Research focus: selective activation of the ghrelin receptor.
• Research focus: growth hormone release without disrupting other hormones (preclinical).
• Research focus: combination with GHRH analogues such as CJC-1295.

Status and context

Ipamorelin is not approved as a medicinal product and is supplied solely as research material. In the context of sport, growth hormone secretagogues are included on the World Anti-Doping Agency’s (WADA) Prohibited List. For research into the synergistic effects with a GHRH analogue, the CJC-1295 no DAC + Ipamorelin blend is a practical, standardised option.

In comparative studies, Ipamorelin is often used as a benchmark against which other secretagogues are assessed. Furthermore, the comparison with a long-acting GHRH analogue demonstrates how two different pathways together influence the release of growth hormone, which is a recurring theme in endocrine research.

Researchers value this reproducibility, because comparative measurements are only meaningful if the source material is pure and consistent.

Ipamorelin is supplied as a lyophilised powder and reconstituted in the laboratory using bacteriostatic water. The steps below describe only the laboratory procedures for research purposes.

1. 1Allow the vial and the bacteriostatic water to reach room temperature.
2. 2Wipe the rubber stoppers of both vials with an alcohol wipe.
3. 3Allow the bacteriostatic water to run slowly down the side of the vial; do not direct it straight onto the powder.
4. 4Gently swirl the vial until everything has dissolved; do not shake.
5. 5Store the solution in the fridge and label it with the date and batch number.

You can find supplies such as bacteriostatic water, insulin syringes and alcohol wipes under ‘Lab & Accessories’. This is a laboratory instruction and does not constitute dosage advice for consumption.

Separately or in combination

Decide in advance whether you will be studying Ipamorelin on its own or in combination with a GHRH analogue. If using a combination, record the ratio and the batch number so that the contribution of each component can be traced.

As Ipamorelin is a sensitive peptide, it is important to calculate the concentration accurately; record this calculation for each experiment and work quickly to minimise degradation.

Store intermediate dilutions in a cool place and use them within the agreed time limit; if in doubt, note down the date of preparation so that you can estimate the rate of degradation.

Store Ipamorelin in lyophilised (powder) form in a cool, dark place to ensure maximum stability.

Practical storage tips

• Powder form: freezer (-20 °C) for long-term storage; fridge (2–8 °C) for short-term storage.
• After reconstitution: store refrigerated (2–8 °C) and use within a few weeks.
• Avoid direct light, heat and repeated temperature changes.
• Write the reconstitution date and batch number on the vial.

Careful storage preserves the purity and integrity of the research material.

Consistent, cold storage ensures reliable, repeatable measurements.