What it is
Oryza sativa starch is a fine powder obtained from rice grains, composed mainly of starch granules. In cosmetics it is used as an absorbent and texture-modifying ingredient that takes up oil, reduces shine, and lends a soft, powdery skin feel. It is common in mineral sunscreens and balms where a matte, blurring finish is desired.
Safety & warnings
Rice starch is generally well tolerated and is not a recognized fragrance allergen. As an absorbent powder rather than an oil it is not considered comedogenic, and it is often used to give a lighter, less greasy finish. Sensitivity is uncommon, though a patch test is reasonable for very reactive skin.
Origin & sourcing
Natural; obtained by processing the grains of rice (Oryza sativa) to isolate the starch fraction.
Questions everyone asks
What does rice starch do in sunscreen?
It absorbs excess oil and lends a soft, matte, powdery finish, helping reduce shine and improve skin feel.
Is rice starch heavy on skin?
No. It is a light absorbent powder that typically makes formulas feel less greasy rather than heavier.