The confusion continues over nanoparticles in cosmetics. This uncertainty over safety is one of many reasons why nanobio researchers wish the Beauty Industrial Complex would find a different marketing term and the U.S. Food and Drug Administration would get more aggressive in sorting out safely engineered nanoparticles from untested, nanosized zinc oxide.
The FDA does not have as much authority over cosmetics as it does over, well, food and drugs. An argument can be made, however, that the more-sophisticated cosmetics out there -- L’Oreal's nanosomes, for example -- could qualify as drug delivery devices.
Update: Shopping for answers: Nanotechnology: Another concern for cosmetics users? (By Leigh Grogan, Sacramento Bee)