U.S. health regulators said consumer products that use nanotechnology may have unknown effects on the human body, and advised food and cosmetic companies on Friday to further study the safety of these tiny particles.
Nanotechnology involves designing and manufacturing materials on the scale of one-billionth of a meter - so small it cannot be seen with a regular light microscope.
It is used in hundreds of products in areas ranging from stain-resistant clothing and cosmetics to food additives, but the health effects of nanoparticles are still poorly understood.
Nanoparticles may be able to penetrate the skin, or move between organs, and scientists do not always understand what effect this will have.
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