A sodium soap of branched isostearic acid used as a cleansing agent and emulsifier.
What it is
Sodium isostearate is the sodium salt of isostearic acid, a branched-chain C18 fatty acid. CosIng lists it as a cleansing agent and an emulsifying and cleansing surfactant.
Where it is used
Found in soaps, cleansers, deodorant sticks and some creams.
Limits of interpretation
The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.
Isostearic acid is a mixture of branched isomers, so the raw material is not a single compound.
Functions
- Cleansing
- Helping to keep the body surface clean.
- Surfactant – emulsifying
- Helping suspensions or dispersions of liquids in a second liquid by reducing the surface tension of the substances to be emulsified.
- Surfactant – cleansing
- Wetting body surfaces, emulsifying or solubilizing oils, and suspending soil (generally, such ingredients contribute to the foaming and lathering properties of cleansing products).
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.
Products with this ingredient (26)
- Hollywood Instant Glam On The Go: Makeup Gift Set · Charlotte Tilbury
- Hollywood Instant Look In A Palette: Dreamy Bronzed Beauty Face + Eyes · Charlotte Tilbury
- Hollywood Instant Look In A Palette: Pretty Glowing Beauty Face + Eyes · Charlotte Tilbury
- Crème Liftante · Payot
- Crème Sculptante Nuit · Payot
- Crème Liftante Regard · Payot
- Crème Jeunesse Sublimatrice · Payot
- Soin Jeunesse Regard · Payot
- CC Crème Liftante SPF 30 · Payot
- Coffret Suprême · Payot
- Rituel Booster de Collagène · Payot
- Calendrier de l'Avent 2026 · Payot