What it is
Sodium Starch Octenylsuccinate is a starch chemically modified with octenylsuccinic anhydride to give it useful surface and absorbing properties. In sunscreens and makeup it is used as an absorbent that mops up excess oil and helps reduce shine, and it can improve spreadability and lend a soft, powdery finish. It is valued for refining the sensory feel of creams and tinted products.
Safety & warnings
Modified starches of this type are generally well tolerated and are not commonly associated with irritation or sensitization at cosmetic use levels.
Origin & sourcing
Derived from a natural starch (often corn or other plant starch) that is chemically modified to produce the octenylsuccinate ester.
Questions everyone asks
What does this modified starch do in sunscreen?
It acts as an absorbent and texture agent, helping reduce shine and giving the product a soft, dry finish.
Is it natural?
It starts from a plant-derived starch that is then chemically modified, so it is a nature-derived but processed ingredient.