The emerging role of nanotechnology in skincare.

This review found that nanoparticles in skincare can deliver ingredients more effectively, improve stability, and boost moisturizing and sun protection—but the researchers emphasize a major transparency problem: most product labels don't clearly disclose when nanomaterials are used or what they are. Safety data exists for some nanocosmetics, but the lack of clear labeling makes it hard for consumers to know what they're actually buying.