Thickener
HYDROXYPROPYL OXIDIZED STARCH
Safety score · 0–100
Good
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A modified corn/potato starch — gently thickens and leaves a silky film. A popular plant-based replacement for synthetic film formers.
Hydroxypropyl Oxidized Starch is a chemically modified starch — typically corn or potato — oxidized to introduce carboxyl groups and etherified with propylene oxide to add hydroxypropyl substituents. The dual modification gives stable viscosity, improved cold-water solubility, and a smooth, light, powdery skin feel, making it a favorite in powders, dry shampoos, serums, and mattifying makeup. CIR has reviewed hydroxypropyl starch and considers it safe for cosmetic use. Trace residual propylene oxide is controlled at the manufacturing stage; quality grades specify <1 ppm. No sensitization signals; handling in powder form warrants standard dust precautions.
Function
Skin benefits
- Silky, dry skin feel
- Biodegradable natural thickener
- Mattifying and sebum-absorbing
- Low irritation
Known concerns
- Trace propylene oxide controlled by manufacturer
- Dust inhalation in raw handling
- Minimal at finished-product exposure
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.