Sodium Starch Octenylsuccinate

What is Sodium Starch Octenylsuccinate?

Sodium Starch Octenylsuccinate is a derivative of natural starch from sources like corn or potato, chemically altered by esterification with octenylsuccinic anhydride. This process attaches lipophilic octenyl chains to the starch's glucose units, balancing its water-loving and oil-attracting properties. Primarily used in decorative cosmetics, sunscreens, and leave-on skin products, it excels in oil-absorbing powders and mattifying formulations. In products, it works by trapping sebum through its modified surface, reducing shine while maintaining a dry feel. As an emulsion stabilizer, it reinforces the interface between oil and water phases to prevent separation. Its viscosity-controlling action thickens formulas gently, enhancing spreadability and suspension of other ingredients without heaviness.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Absorbent
Absorbs water and/or sebum to reduce greasiness and shine, improve dry touch, and help keep powders and emulsions feeling lighter on skin.
Emulsion stabilizer
Improves emulsion robustness by preventing droplet coalescence and phase separation, often by thickening, structuring, or strengthening the interfacial layer.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Benefits

Absorbs excess sebum for a matte, less greasy finish

Supports emulsion stability to maintain product integrity

Regulates thickness for improved texture and application

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
People with oily skin needing shine control
Individuals with rare starch allergies
Users of powders and creams for better stability
People sensitive to corn-derived ingredients
Those seeking mild, multifunctional formulation aids
Anyone experiencing irritation from similar thickeners

Safety Notes

  • Considered safe for use in cosmetics by expert reviews
  • Low comedogenic potential, unlikely to clog pores

Frequently Asked Questions about Sodium Starch Octenylsuccinate

What is Sodium Starch Octenylsuccinate derived from?

Natural starch from plants like corn or potato, modified for better oil interaction in cosmetics.

Is it suitable for oily skin products?

Yes, it absorbs sebum effectively to reduce shine in powders and emulsions.

Does it cause irritation?

Typically low irritation potential based on cosmetic safety evaluations.