Snapshot
- Overview
- A fatty acid that thickens formulas for a smooth, non-greasy feel.
- Category
- Tone/Texture, Skin Conditioning
- Type
- Thickener
Hydroxystearic Acid
Hydroxystearic acid is a saturated hydroxylated C18 fatty acid that works as a rheology modifier and structuring wax in oils and emulsions. It increases viscosity, stabilizes texture across temperatures, and creates a smooth, non-greasy feel.
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Our take
Is Hydroxystearic Acid a Good Ingredient?
Rated Good as a reliable thickener and structurant that stabilizes viscosity and improves glide, though it offers limited direct skin benefit on its own. In richer formats it can feel heavy and may be less suitable for acne-prone skin at high concentrations, which keeps it from a higher rating.
What it does
Skin Benefits
Gives formulas a plush, uniform feel and supports shape retention during everyday use. Contributes to a smooth glide on application.
Where you'll find it
Uses in Skincare & Cosmetics
Used in creams, balms, sticks, and mascaras to build body and create an elegant, stable texture.
Before you use it
Safety
Generally well tolerated with low irritation potential. In heavier, occlusive systems it may contribute to breakouts for some acne-prone users. No widely recognized regulatory limitations at typical use levels.
Products with Hydroxystearic Acid
