INCI Naming for Cosmetic Peptide Actives — Decoding the Label You're Putting on Your Brand
Every peptide active on your ingredient list has an INCI name — sometimes obvious (Copper Tripeptide-1), sometimes opaque (rh-Oligopeptide-1). What the naming conventions actually mean, where the marketing name and the INCI name diverge, and what to put on the label so the regulators and consumers both get what they need.
Published May 25, 2026 · 6 min read · By Pepoderma Regulatory Team
When a cosmetic brand commits to a peptide active, it commits to two names: the marketing name (often the peptide's research designation like "GHK-Cu" or a brand-defined name) and the INCI name (the regulated label-disclosure name, like "Copper Tripeptide-1"). The two are different and have different functions. The INCI name is what goes on the label; the marketing name is what goes in the brief and the marketing copy. Conflating them creates compliance issues; managing them separately is a routine part of cosmetic product development.
What INCI actually is
The International Nomenclature of Cosmetic Ingredients (INCI) is a standardized naming convention managed by the Personal Care Products Council (PCPC) in the United States, originally established in 1973. INCI names are the regulated label-disclosure names required by cosmetic legislation in essentially every major market:
- United States — FDA mandates INCI on cosmetic product ingredient statements under the Federal Food, Drug, and Cosmetic Act
- European Union — EU Cosmetics Regulation (EC) No 1223/2009 requires INCI from the EU INCI glossary on product labels
- Canada — Health Canada's Cosmetic Regulations require INCI on all cosmetic labels
- UK, Switzerland, Norway, Japan, China, Korea — each has its own legislation but each adopts or closely tracks INCI as the standard
A finished cosmetic product's ingredient list, ordered by descending concentration above 1% and free order below 1%, must use INCI names. There is no legal flexibility on this; alternative names, marketing names, or "common" names cannot replace the INCI name on the label.
How INCI names for peptides actually look
INCI names for peptide actives follow a few conventions:
| Convention | Example | What it tells you |
|---|---|---|
| Sequence-derived with copper coordination | "Copper Tripeptide-1" (for GHK-Cu) | The molecule is a 3-residue peptide bound to copper; the "-1" suffix is the catalog index for the specific Gly-His-Lys sequence |
| Numbered series for synthetic / recombinant peptides | "Acetyl Hexapeptide-8" (the Argireline marketing name) | A 6-residue synthetic peptide acetylated at the N-terminus; "8" is the catalog number |
| rh- prefix for recombinant human peptides | "rh-Oligopeptide-1" | Recombinant human-sequence oligopeptide; the "rh-" prefix flags recombinant origin |
| sh- prefix for synthetic versions of human peptides | "sh-Oligopeptide-1" | Synthetic version of the same sequence |
| Conjugation suffix | "Palmitoyl Pentapeptide-4" (Matrixyl marketing name) | 5-residue peptide with a palmitic acid conjugate; "-4" is the catalog index |
Two peptides can have very similar INCI names but be different molecules. "Acetyl Tetrapeptide-2" and "Acetyl Tetrapeptide-5" are both 4-residue acetylated synthetic peptides but with different sequences. The catalog index disambiguates them.
Conversely, the same INCI name applies to a single specific molecule regardless of supplier — "Copper Tripeptide-1" is GHK-Cu, period. The supplier's marketing name might be "RegeneraCu" or "BlueComplex" but the INCI is "Copper Tripeptide-1" and that's what appears on every label that includes it.
Where marketing names and INCI names diverge
Pre-launch consumer testing: focus groups react to marketing names (memorable, brandable, often evocative). Once the product ships, the back-of-label is INCI only. Brands that train consumers on a marketing name without also exposing the INCI risk losing recognition when consumers compare labels at the point of sale.
Re-formulation: if a brand switches the supplier of a Cu-peptide active from one vendor's "RegeneraCu" to another's "BlueComplex," the label INCI stays the same ("Copper Tripeptide-1"). The marketing position may or may not change depending on how the brand has positioned the marketing name internally.
Substantiation: claims made about a marketing name (e.g. "RegeneraCu reduces wrinkle depth by 22%") must be substantiated against the actual molecule the INCI describes. If a brand cites a research study about GHK-Cu in support, the substantiation chain ties marketing name → INCI → research molecule. Marketing claims that don't reduce to a defensible INCI-level molecule are vulnerable in regulatory review.
What's required on the label vs allowed in marketing
The label content is constrained. The marketing content is largely free.
On the label (mandatory): INCI names, in descending order above 1%, free order below 1%; product function; net quantity; manufacturer / responsible person; batch number; expiration date or PAO; warnings if applicable.
On the label (allowed): marketing name as a product brand; claims if substantiated and compliant with regional cosmetic claims regulations.
In marketing materials (allowed): marketing names, research citations, mechanism explanations, before/after imagery (with regional rules on the claim language).
A brand that places a marketing claim on the front of the package (e.g. "Contains RegeneraCu, our proprietary copper peptide complex") must list the actual INCI ("Copper Tripeptide-1") on the back. Most regulatory inspections check that the back-of-label matches the actives the marketing claims describe.
Pepoderma support for INCI naming
Every Pepoderma cosmetic-grade peptide active ships with: - The exact INCI name applicable in EU, US, Canada, UK markets noted on the SDS and the COA - The CAS number where applicable (for the active itself + for any sub-component) - Supporting documentation for any non-standard INCI name (rh- vs sh- distinctions, complex-component disclosures) - INCI-compliant ingredient list contributions for any Pepoderma multi-component product (peptide + carrier + preservative)
Available on request for brand teams launching in specific markets: - Per-market label review against the local equivalent of INCI (PCPC dictionary for US, EU INCI glossary for EU, Japan's cosmetic ingredient list) - Substantiation chain mapping the marketing name → INCI → published research - Notification-document support (INCI-formatted ingredient list for CPNP / FDA / SFDA / etc. submissions)
A label compliant with INCI is the floor, not a ceiling — what the brand says about the product in marketing is where the differentiation lives. But the floor matters: get the INCI wrong on the label and the entire product can be subject to enforcement action regardless of how good the marketing position is.