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INCI names / Stearic acid

Stearic acid INCI name

The INCI name for stearic acid is Stearic Acid. A lotion, balm or bath product lists it by that name. In cold-process soap it is a fatty acid, so the lye turns it into soap (sodium stearate, or potassium stearate with potassium hydroxide), so the tools list it as added and flag it for you to check.

In lotions, balms and other cosmeticsStearic Acid
In cold-process soapIt is a fatty acid, so the lye turns it into soap (sodium stearate, or potassium stearate with potassium hydroxide). The tools list it as added, "Stearic Acid", following Article 19(1)(g) of the Cosmetics Regulation ("at the time they are added"), and flag it for you to check. To name what the bar holds instead, add inci: with that name to the line.
On a US labelStearic Acid
In Great Britain and Northern IrelandThe same name as the EU. Northern Ireland uses the EU glossary cited below; Great Britain still uses the glossary it kept from the EU, where the name has another entry number.
What it is used for (CosIng)cleansing, surfactant (emulsifying), emulsion stabilising, fragrance, refatting, surfactant (cleansing)

Glossary citation: Stearic Acid #27798 (Commission Implementing Decision (EU) 2025/1175 on EUR-Lex).

In the soap or skincare tool, put it on its own line with its weight, for example "stearic acid, 5", and the tool prints the name for the region you choose.

Related

Transcribed from the EU glossary of common ingredient names (Implementing Decision (EU) 2025/1175) and checked against it; the US names are the ones FDA's substance registry (GSRS) records, and the uses are those CosIng, the Commission's cosmetic ingredient database, lists. A labelling reference.