INCI names and ingredient lists explained for online sellers

INCI stands for International Nomenclature of Cosmetic Ingredients. It is a naming convention, not a law. Regulators, chemists and brands share it so that a carton sold in Lyon and a carton sold in Austin describe a substance in the same words.

The printed list on a box is something slightly different. It takes those names and arranges them in the order the market’s rules require. That order broadly runs from the largest quantity to the smallest, with separate handling for tiny amounts. The ordering, the exemptions and the wording sit in local law, such as the EU Cosmetics Regulation or the US Modernization of Cosmetics Regulation Act, known as MoCRA.

This article describes common practice. It is not legal advice. Please confirm exact wording with your regulatory adviser or, in the EU, your responsible person, before a carton goes to print.

Start with water. A European label says Aqua. An American label usually says Water. Both point to the same ingredient, so a seller shipping to both markets must hold two spellings of one thing and know which goes where.

Plants add another layer. The INCI entry carries the Latin botanical name with the common name in brackets, as in Butyrospermum Parkii (Shea) Butter, yet your product page may simply say shea. Almond becomes Prunus Amygdalus Dulcis Oil.

Then come the cousins that are not duplicates at all. Vitamin E in marketing copy may be Tocopherol, Tocopheryl Acetate or Tocopheryl Linoleate in the formula, and each is a different substance. A listing that merges them misstates the product.

Drift usually starts with a formula change. The lab swaps a thickener, the printer updates the carton, and nobody touches the product page, so a marketplace feed built last spring still carries the old list.

Copy and paste adds its own errors. Supplier specification sheets use trade names, so a tired editor pastes Phenoxyethanol from one sheet and Euxyl PE 9010 from another into the same field. Euxyl PE is a supplier’s trade name for a blend, and the pack must print the INCI names of its parts instead of the brand name. Shoppers with allergies read these pages closely.

Bundles multiply the trouble. A gift set holds a cleanser, a serum and a cream, so its page needs three lists in three orders, one for each jar. Most teams keep it in a spreadsheet. Nobody owns that file.

Give every formula a version number and release date, then store its ingredients as rows, one per ingredient, in the order of weight in the batch. Each row holds the INCI name, the supplier’s trade name, the function, such as humectant or preservative, and the market it applies to.

The carton artwork, the product page, the marketplace feed and the retailer data sheet all read from that single list, so nobody retypes names from a PDF. When the lab releases version four, the list changes once. Every output flags itself for review.

Treat each market’s rules as a view on the list, never as a second copy that somebody must remember to update by hand. The EU view prints Aqua and marks named fragrance allergens. The US view prints Water. Both come from the same rows, so they cannot disagree.

Pick your best-selling product. Lay the carton, the product page, the marketplace listing and the supplier specification side by side, then read the first ten ingredients on each in order.

Mark every difference. Some are harmless, such as Aqua against Water for different markets. Others are real, such as a missing ingredient, a swapped preservative or a changed order, and each one is a listing to correct before the next order.

Send the findings to whoever owns the formula, agree which document is the master, and write that rule on the sheet so the next new starter follows it. Repeat with the next five products.