Aluminum starch octenylsuccinate is a modified corn starch in which octenylsuccinate groups and aluminum ions alter its surface and function. It absorbs oil, improves slip and soft-focus, boosts thickening, and aids powder flow in formulas.
Absorbs oil and blurs shine for a smooth, matte finish.
Category
Oil Control, Tone/Texture
Type
Rheology Modifier
Ratings
Overall Rating
Good
Comedogenic Risk
None
Not typically evaluated for comedogenicity — no standardized rating available.
Our take
Is Aluminum Starch Octenylsuccinate a Good Ingredient?
This rates Good: Effective at oil absorption and improving slip/mattifying feel, with a low irritation profile for most users. It is not a treatment ingredient and may feel drying on very dry or sensitive skin.
What it does
Skin Benefits
Cuts down visible shine and helps makeup stay put longer on oily areas. Leaves a silky, soft-touch finish that feels lightweight.
Where you'll find it
Uses in Skincare & Cosmetics
Frequently used in mattifying primers, pressed powders, and setting powders; also included in liquid foundations and sunscreens to improve feel and reduce greasiness.
Before you use it
Safety
Typically well tolerated, though it can be drying and may cause mild irritation in sensitive areas. Avoid inhalation of airborne powder during application.