Two of England’s respected scientific societies feel there are too many unknowns and the toxic potential is great enough to warrant approving the sale of cosmetics laced with nanoparticles. The the U.S. FDA has a less restrictive policy.

“Preliminary experiments in animals have found nanoparticles capable of moving into and damaging the lungs, brain and other organs. And while some nanomaterials may be able to neutralize poisons in soil or groundwater, others appear environmentally toxic themselves.”

The joint report expresses enthusiasm about the possibilities of nanotechnology but cautions strongly that both sides of the story must be investigated thoroughly before moving ahead with individual applications.