Cosmetic-grade vs research-grade peptides

What an INCI name is and who assigns it, what documents a cosmetic formulator needs from an ingredient supplier, and why a vial labelled research use only is not a cosmetic raw material.

By Touchstone PeptidesSeptember 22, 20266 minute read

A cosmetic-grade peptide and a research-grade peptide can be the same molecule from the same synthesis house. What separates them is the paperwork and the declared purpose: a cosmetic ingredient is sold under an INCI name, with a document pack that supports an ingredient declaration on a finished label, and a research vial is sold for laboratory work and labelled that way. The grade is a description of the documents and the intended use, not a description of the chemistry.

What an INCI name is

INCI stands for International Nomenclature Cosmetic Ingredient. INCI names are systematic names used to identify ingredients on cosmetic labels in the United States, the European Union and most other markets. They are developed by the International Nomenclature Committee and administered by the Personal Care Products Council, which publishes them in the International Cosmetic Ingredient Dictionary and Handbook and in wINCI, its web edition.

Assignment is an application process rather than an automatic naming. The committee meets roughly five times a year, reviews a capped number of applications per meeting, and publishes the names it designates. The Council's own page adds a line that marketing copy routinely mangles: "just because an ingredient has an INCI name does not mean that the ingredient has been approved for cosmetics."

Two peptides in the catalog carry names of this kind. GHK-Cu, the glycyl-histidyl-lysine copper complex covered at length in why the powder is blue, appears in chemical databases with the synonym Copper Tripeptide-1, tagged as an INCI name. SNAP-8 appears as Acetyl Octapeptide-3, alongside the older synonym Acetyl Glutamyl Heptapeptide-3. Those are label names. They are how an ingredient is declared, and they carry no statement about what a formulation does.

Why the name matters on a label

In the United States the ingredient declaration is a regulation, not a convention. 21 CFR 701.3(a) requires that "the label on each package of a cosmetic shall bear a declaration of the name of each ingredient in descending order of predominance". Section 701.3(c) sets the order of preference for the names themselves, beginning with names specified by the Commissioner and then names from the dictionary the cosmetic industry maintains, which is the INCI dictionary in its successive editions. Ingredients present at not more than one per cent may be listed without respect to order, after the ones present in greater concentration.

That is why a formulator asks a supplier for an INCI name first. Without one there is no correct way to write the ingredient on the finished carton.

What a cosmetic raw-material document pack contains

An ingredient supplier selling into cosmetic manufacturing is expected to hand over a pack a formulator can file. In practice it holds:

The INCI name, the CAS number where one exists, and any synonyms.
A product specification: appearance, identity, assay, loss on drying or water content, and the acceptance criteria the supplier holds itself to.
A batch-specific certificate against that specification.
A safety data sheet. Under 29 CFR 1910.1200(g)(1), chemical manufacturers and importers "shall obtain or develop a safety data sheet for each hazardous chemical they produce or import", in the sixteen-section format the standard sets out.
Origin and composition statements: country of manufacture, synthetic or biological origin, solvent and carrier declarations.
Elemental impurity and microbiological statements where the customer's own specification calls for them.
Documentation supporting the manufacturer's own quality system, and often a statement on animal testing status for markets that require one.

Under the Modernization of Cosmetics Regulation Act, the obligations sitting above that pack belong to the finished-product company: facility registration with FDA and renewal every two years, product listing including ingredients with annual updates, records supporting adequate safety substantiation, and serious adverse event reporting within fifteen business days. FDA's MoCRA page, content current as of August 10, 2026, also notes that the required good manufacturing practice regulations are still in rulemaking. An ingredient supplier's pack is what lets the responsible person build those records; it does not discharge them.

Where the line actually sits

The line between a cosmetic and a drug is drawn by intended use, not by ingredient. FDA sets both statutory definitions out on one page:

Articles intended to be rubbed, poured, sprinkled, or sprayed on, introduced into, or otherwise applied to the human body ... for cleansing, beautifying, promoting attractiveness, or altering the appearance [FD&C Act, sec. 201(i)] ... articles intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease ... and articles (other than food) intended to affect the structure or any function of the body of man or other animals [FD&C Act, sec. 201(g)(1)].FDA, "Is It a Cosmetic, a Drug, or Both? (Or Is It Soap?)", current as of September 11, 2024

A product can meet both definitions at once when it has more than one intended use, and FDA establishes intended use from labelling claims, advertising and consumer perception. The same page settles a term the trade still uses: "the term 'cosmeceutical' has no meaning under the law."

None of that changes what is in a vial. It changes what may be written beside it, which is why a supplier selling one molecule into two channels needs two sets of documents and two sets of copy.

Why a research vial is not a cosmetic raw material

A vial on this site is supplied for laboratory research use, and that has four consequences for a formulator:

The label is a research label. It is not an ingredient declaration, and it is not written to support one.
The specification is a research specification. Purity by RP-HPLC and identity by mass spectrometry answer the questions a bench user asks; a cosmetic specification usually asks for more, and asks it against the customer's own acceptance criteria.
The quantities and pack format are laboratory quantities in a lyophilized vial, not bulk raw material with a retained sample programme behind it.
The intended use on our paperwork is research. A supplier who lets a research vial be represented as a cosmetic ingredient has changed the intended use of the article, which is precisely the analysis FDA applies under 21 CFR 201.128.

As of September 21, 2026 we do not sell cosmetic raw materials and we make no cosmetic claims for anything in the catalog. Formulator enquiries about ingredient-grade material, documentation or custom synthesis go through the quote form, where a person answers them.

What a formulator should ask a peptide supplier

The INCI name and the CAS number, and whether the name is the supplier's assertion or a designated entry.
A batch-specific certificate, with the laboratory named, and the specification it was tested against.
The safety data sheet, current and in the sixteen-section format.
Country of manufacture and the identity of the manufacturing site, not just the seller.
The salt form and counter-ion, which for a synthetic peptide is usually trifluoroacetate unless it has been exchanged, and the net peptide content that follows from it. Purity is not potency sets out why those two figures move independently.
Whether the supplier will support the documentation the responsible person needs, and in writing.

The answers arrive as documents or they do not arrive.

Sources

For laboratory research use only. Not a drug, not a supplement, and nothing here is a claim about what any of this material does in a person or an animal.

Two things before you come in.