This comprehensive review found that inorganic nanoparticles like titanium dioxide and zinc oxide are increasingly used in cosmetics—especially sunscreens—because they're cheaper, more stable, and cause less irritation than alternatives. However, the researchers emphasize that safety concerns exist: toxicity to humans and environmental impact need careful evaluation, and regulatory oversight varies globally, meaning what's approved in one country might not be in another.

This wasn't a new experiment—it's a literature review that synthesized existing research on inorganic nanoparticles used in skincare and cosmetics, examining their chemical properties, how they're formulated into products, known toxicity data, and current regulatory status across regions.

Funding not disclosed in abstract