How and why are nanoparticles in sun cream?

Nanoparticles, often in the form of zinc oxide or titanium dioxide, are used in sun creams because they provide effective UV protection while being less visible on the skin compared to traditional larger particles. Their small size allows them to scatter and absorb UV radiation efficiently, enhancing the product's overall efficacy. Additionally, nanoparticles improve the formulation's texture and spreadability, making the sunscreen more appealing to consumers. This innovation aims to balance protection with cosmetic elegance, ensuring that users receive effective sun defense without the white cast associated with older formulations.