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Aluminum Starch Octenylsuccinate

Low concern

Considered safe by the Cosmetic Ingredient Review for topical use. Contains aluminum, which has prompted general concerns about chronic exposure, though dermal absorption is minimal.

What it is

A modified starch reacted with octenylsuccinic anhydride and complexed with aluminum, used as a powder texturizer.

Primarily a cosmetic ingredient; absorbs oil and improves slip in powders, sunscreens, and antiperspirants. Rarely used in food.

Why it's flagged

Contains aluminum (low dermal absorption)

Regulatory status

United States — FDA

Permitted in cosmetics

European Union — EFSA

Not evaluated as a food additive

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