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Unlabelled research vial
Illustration: a blank vial with the compound’s name set on it, not a product photo or a test result.

Growth hormone axis

Ipamorelin

Also listed as NNC 26-0161

Ghrelin receptor (GHS-R1a) agonist pentapeptide

  • GHS-R1a
Formula
C38H49N9O5
Molar mass
711.85 g/mol
CAS number
170851-70-4

Identity

What the molecule is, from its PubChem record. These are the figures a certificate of analysis should agree with.

Class
Ghrelin receptor (GHS-R1a) agonist pentapeptide
Sequence

H-Aib-His-D-2Nal-D-Phe-Lys-NH₂

  • Five residues with a C-terminal amide.
  • Aib is α-aminoisobutyric acid; D-2Nal is D-3-(2-naphthyl)alanine; D-Phe is D-phenylalanine.
Molecular formula
C38H49N9O5
Molar mass
711.85 g/mol
CAS number
170851-70-4

Checked against PubChem on 27 September 2026. Molar mass is calculated from the formula with standard atomic weights and agrees with PubChem’s published molecular weight. In sequences, H- marks a free N-terminus, -OH a free C-terminal acid and -NH₂ a C-terminal amide.

Research context

Ipamorelin is a synthetic pentapeptide agonist of the growth hormone secretagogue receptor (GHS-R1a, also called the ghrelin receptor). Laboratory studies examine GHS-R1a activation in receptor-binding and pituitary cell assays, and how selectively it acts compared with earlier growth hormone secretagogues such as GHRP-6.

Research use only. Everything on Vialwise concerns research-grade material sold for laboratory and analytical use only. It is not a registered medicine, is not supplied for human or veterinary use, and nothing here is medical advice.

Storage and handling

  1. Store sealed lyophilised powder at −20 °C, dry and away from light.

  2. Let the vial reach room temperature before opening, so moisture doesn’t condense on the powder.

  3. Reconstitute in sterile water, or in the buffer your protocol specifies. Swirl gently rather than shake.

  4. Split the solution into single-use aliquots and keep them frozen, so no portion goes through repeated freeze–thaw.

General laboratory practice for this class of material; your institution’s own procedures come first. To work out concentration and aliquot volumes from a vial’s mass, use the reconstitution calculator. For the reasoning behind each step, read storing lyophilised peptides.

Published lab reports

Lab reports for Ipamorelin at Au Peptide Labs Our store

The one supplier whose full report list we have.

Open each lab-linked report on the lab’s own website to confirm it.

Other suppliers publish their reports on their own sites. Where each supplier publishes its COAs

Vialwise is published by APL Research Pty Ltd, which also runs Au Peptide Labs. Every supplier, ours included, is scored on the same published checklist. How we handle this

Any supplier

Check any supplier’s Ipamorelin COA

These checks take a few minutes and work the same on a report from any supplier, ours included. The walkthrough shows each one on a real Janoshik report.

How to verify a Janoshik COA
  1. Open it at the lab

    The report should load on the testing lab’s own website from the verify link or task number, not only as a PDF or screenshot from the supplier.

  2. Match the name

    The sample should be named Ipamorelin or NNC 26-0161, or a clear equivalent. A different compound name means a different report.

  3. Match the mass

    If the report includes a mass-spectrometry result: a deconvoluted average-mass result should sit close to 711.85 g/mol; high-resolution reports give the slightly lower monoisotopic mass, and raw spectra show m/z for charged ions (mass ÷ charge). How HPLC and mass spec work.

  4. Match the vial

    The sample amount on the report should match the vial size you’re buying. A report on a different size or an older batch tells you less about the vial in front of you.

Related

Full library
  • Growth hormone axis

    CJC-1295 (no DAC) + Ipamorelin

    Two-peptide research blend (GHRH analogue and GHS-R1a agonist)

    Blend of 2 peptides

  • Growth hormone axis

    Tesamorelin

    GHRH analogue (44 residues, N-terminally modified)

    C221H366N72O67S5135.78 g/mol

  • Growth hormone axis

    AOD-9604

    Growth hormone C-terminal fragment analogue (16 residues)

    C78H123N23O23S21815.08 g/mol