This is an identity reference for ipamorelin. It describes what the name denotes and the structural features relevant to confirming and analysing it. It makes no claim about what the compound does and contains no preparation or handling guidance.
What the name refers to
Ipamorelin is a synthetic pentapeptide amide. Its sequence is conventionally written Aib-His-D-2-Nal-D-Phe-Lys-NH2, and three of those five positions are not ordinary protein residues:
- Aib — alpha-aminoisobutyric acid, a residue with two methyl groups on the alpha carbon. It is achiral and strongly constrains backbone conformation.
- D-2-Nal — the D-enantiomer of 3-(2-naphthyl)alanine, carrying a naphthalene ring in place of a standard side chain.
- D-Phe — the D-enantiomer of phenylalanine.
The C-terminus is an amide rather than a free carboxylate. That is part of the specification: the amide and free-acid forms differ by roughly 1 Da and are different compounds.
Why the non-natural residues matter for identity
Two of the residues are D-enantiomers, and stereochemistry is invisible to a mass measurement. A sample in which one of those positions has racemised has exactly the same molecular weight as correct material, so mass spectrometry cannot detect the problem. Only chromatographic separation can, and only if the method resolves diastereomers — which is not guaranteed.
This makes ipamorelin a compound where the quality of the chromatographic method matters more than average. A steep gradient that compresses the run is more likely to hide a diastereomeric impurity than a shallow one.
Analytical characteristics
Aromatic content. The naphthyl and phenyl side chains give real absorbance at 280 nm, unlike many short peptides. Detection at 214 nm remains the appropriate general basis for purity, but this is one compound where a 280 nm trace is at least meaningful.
Hydrophobicity. Two aromatic residues, one of them a naphthalene, make the molecule considerably more hydrophobic than its length suggests. It retains strongly under reverse-phase conditions and elutes late in a typical gradient.
Basic sites. The lysine side chain, the histidine imidazole and the N-terminal amine all associate with counter-ions after purification, so counter-ion form and net peptide content belong in any molarity calculation.
Confirming identity independently
Because the non-natural residues are where errors occur, the sequence — including the stereochemistry designations and the C-terminal amide — is the identifier to check, not the name. Our product pages carry compound identity links that search public chemical databases directly.
What we publish
Ipamorelin sits in our GHRH and ghrelin receptor peptides category, a grouping by the receptor system the compound is studied against rather than by any intended outcome. The product page carries an independent reverse-phase HPLC analysis, net peptide content, counter-ion form and vial size. Vials carry no batch or lot numbers and are matched to their published test by crimp and cap colour.
Research use only. All products supplied by Battle Born Peptides are laboratory reference materials for in-vitro research and analytical use by qualified professionals. They are not drugs, foods, dietary supplements, cosmetics or medical devices; they are not approved by the FDA or any other regulator for use in humans or animals; and they are not intended to diagnose, treat, cure, mitigate or prevent any disease, or to affect the structure or any function of the body of humans or animals. Nothing in this article is preparation, handling or dosing guidance. See our full research-use terms.