Getting the INCI Name From a Supplier Document

Every raw material you buy shows up under a trade name on the invoice and a completely different name on the filing. "Cosmowax J" tells you nothing about what to write on a CNF. So where do you actually find the INCI name, and why do three different supplier documents sometimes disagree with each other?

Start with the SDS, but read the right section

A safety data sheet has 16 sections by standard format, and section 3 (composition and information on ingredients) is where you want to look first. This is where a supplier is supposed to list the chemical identity of hazardous components, sometimes with CAS numbers attached. The catch: SDS section 3 is written for hazard communication, not cosmetic labeling, so it may only list components above a certain hazard threshold. A fully safe ingredient at low concentration might not appear there at all.

The technical data sheet usually has the full picture

The TDS (technical data sheet) is where suppliers tend to put the complete INCI declaration, especially for blends. If you're buying a preservative system or an emulsifier blend, the TDS is usually your best source for the full list of INCI names that make up the product, often alongside the percentage or percentage range of each component. This is exactly the information you need to expand a blend into its real components and calculate true concentrations in your finished product.

The spec sheet fills in the gaps

A certificate of analysis or spec sheet won't always carry INCI names, but it often has the CAS number, which you can use to cross-reference. If a supplier gives you a CAS number without an INCI name, or an INCI name without a CAS number, you can generally confirm the match using either value since both point to the same underlying substance.

A quick way to organize what you're looking for:

Document	What it usually has	What it's missing
SDS	CAS number, hazard classification, section 3 composition	Full INCI list for low-hazard components
TDS	Full INCI breakdown, blend components, use levels	Sometimes no CAS number
Spec sheet / CoA	CAS number, purity, physical specs	INCI name is often absent

When the supplier only gives you a trade name

This happens more with smaller or overseas suppliers, especially for fragrance oils and specialty extracts. A few things to try, in order:

1. Ask directly. Most suppliers will provide an INCI statement on request even if it isn't on the standard paperwork; it costs them nothing and it's a normal ask.
2. Search the trade name alongside the manufacturer's name. Many trade names are registered and documented publicly by the ingredient supplier itself.
3. Request the SDS specifically, since a supplier that's slow to send a TDS will often still have an SDS on file, and section 3 may get you enough to work with.
4. For a fragrance blend, ask for the allergen declaration alongside the INCI statement. You'll need this anyway for the mandatory allergen disclosure lists that phase in through 2026.

Never guess at an INCI name from a trade name that sounds similar to something you recognize. Cosmetic ingredient naming is standardized precisely so that "sounds like" isn't a substitute for a documented match, and a wrong INCI name on a filing is worse than a delayed one.

Botanical extracts are their own puzzle

Some botanical extracts genuinely don't have a CAS number, since CAS numbers are assigned to defined chemical substances and a whole-plant extract can be a complex mixture without one fixed structure. In that case, the INCI name itself (something like a Latin binomial plus "Leaf Extract" or "Root Extract") is what you use for the filing, and you shouldn't expect or chase a CAS number that may not exist.

Keep a running file per supplier

Once you've tracked down an INCI name and CAS number for a raw material, save it. Suppliers reformulate blends occasionally without renaming the trade product, so it's worth re-confirming the INCI breakdown when you get a new lot of anything, not just the first time you order it.

If you're working through a long ingredient list and don't want to chase this document by document, Cosmetic Comply matches trade names and blends to their INCI names and CAS numbers automatically, expanding each blend into its real components with the percentages carried through, so you're not left guessing at what a supplier document didn't spell out.