Realistic exposure study supports the use of zinc oxide nanoparticle sunscreens

An important new study provides the first direct evidence that intact zinc oxide nanoparticles neither penetrate the human skin barrier nor cause cellular toxicity after repeated application to human volunteers under in-use conditions. This confirms that the known benefits of using ZnO nanoparticles in sunscreens clearly outweigh the perceived risks, reports the Journal of Investigative Dermatology.