Cosmetic peptide INCI and CAS identity: build a usable material dossier

A cosmetic peptide dossier should connect the ingredient name and chemical identity with the preparation actually supplied. Include the active component, carriers, relevant composition basis and batch records. An INCI name or CAS identifier cannot supply all of that information on its own.

Give each identifier a defined job

A trade name identifies a commercial offer. An INCI name supports cosmetic ingredient naming. A CAS Registry Number identifies a chemical substance in the CAS system. CAS explains that its identifiers connect substances with their chemical information despite the different names used for them. [1]

For a peptide ingredient, the dossier also needs the chemical form relevant to the offer. A copper-peptide complex, an acetylated peptide and a palmitoylated peptide raise different identity questions. Ask the supplier to reconcile the commercial name with its technical description, rather than treating a similar-sounding name as a full specification.

Identify the supplied preparation

A cosmetic raw material may be a powder, a solution or a mixture containing a peptide alongside carriers and other components. The active ingredient’s identifier does not describe every component of that preparation. Record the supplied form and the composition information needed by the formulator and the safety assessor.

Keep a revision-controlled link between the trade name, ingredient naming, specification, safety information and batch COA. If a document describes a preparation under an older trade name, request a written explanation of the connection before accepting it as the current offer.

Use CosIng as a source of information within its stated scope

The European Commission describes CosIng as an informational database with no legal value. It states that an INCI entry in the inventory does not, by itself, establish permission or approval to use an ingredient. [2] Save the relevant entry and the date of the check, then let the destination-market review address permitted use and finished-product requirements.

The Commission’s glossary page links ingredient naming under Article 19 and the glossary under Article 33 of the EU Cosmetics Regulation. It lists Commission Implementing Decision (EU) 2025/1175 among the relevant glossary documents. [3] Keep the nomenclature version with the artwork record so that an ingredient-name review can be repeated when packaging changes.

Separate active concentration from analytical purity

Formulators need to know what a composition figure measures. An analytical purity result for an isolated peptide and the active concentration in a supplied solution have different denominators. A high purity percentage should not be copied into the formulation worksheet as the active fraction of the whole commercial preparation.

Consider a hypothetical supplier preparation containing 1.0% active peptide by mass. If that preparation represents 2.0% of a formula by mass, the arithmetic active fraction is:

1.0% × 2.0% = 0.02% active in the formula

This example explains composition basis; it is not a formulation recommendation or a result for a supplied product. Before using the calculation, the formulator must establish that the supplier’s figure really is an active mass fraction on the relevant basis. A chromatographic area percentage or an incompletely described dry-basis result cannot simply replace it.

Keep carriers visible in the dossier

A change in carrier, preservative system or other preparation component can affect the formulator’s assessment even if the peptide’s name stays the same. Ask which components remain fixed in the supply specification and which changes require notification. Match composition changes to the applicable document versions and affected lots.

Assemble the dossier around decisions the team must make

For EU projects, the Cosmetics Regulation distinguishes the finished-product safety assessment, product information file and labelling duties in Articles 10, 11 and 19. [4] A raw-material dossier contributes information to that work. It does not replace the responsible person’s finished-product assessment.

Resolve identity gaps before approving the supply brief

• Ask the supplier to reconcile inconsistent names or identifiers across documents.
• Confirm whether a percentage refers to the isolated active or the whole supplied preparation.
• Request the current specification and COA for the material being offered.
• State the destination market and the intended cosmetic application.
• Assign ownership for nomenclature, safety review and label approval.

Use the cosmetic peptide material enquiry to identify the ingredient preparation. The guide to cosmetic ingredient qualification covers the broader supplier review. For a private-label project, connect the dossier with OEM and ODM development before approving a finished-product description.