What is the use of silica nanoparticles in cosmetics?

Silica nanoparticles are widely used in cosmetics primarily to enhance texture and deliver active ingredients effectively. These nanoparticles create a smooth and matte finish on the skin, which improves the overall feel and aesthetics of cosmetic products. Their small size allows for a better dispersion within formulations, ensuring that active ingredients can be delivered more efficiently and evenly onto the skin.

Additionally, the unique properties of silica nanoparticles, such as their ability to absorb oils and control shine, make them particularly useful in formulations aimed at oily skin types or products designed for long-lasting wear. This functionality not only contributes to an enhanced sensory experience but also can improve the product's performance by ensuring active ingredients, such as vitamins or skin-repairing compounds, are delivered where they are most needed.

The other options do not accurately represent the primary function of silica nanoparticles in cosmetics. While they might play a role in thickening products or extending shelf life to a degree, their most notable impact lies in texture improvement and the effective delivery of active components in cosmetic formulations.