Nanotechnology is measured in billionths of a meter, encompassing all aspects of life from food to medicine, clothing, to space. Imagine hundreds of microcomputers on the width of a strand of hair programmed for specific tasks....in your body. Sound good?
Engineering at a molecular level may be a future corporations' dream come true, however, nano-particles inside your body have few long-term studies especially when linked to health issues. Despite this new huge income-generating field there is a growing body of toxicological information suggesting that nanotechnology when consumed can cause brain damage (as shown in largemouth bass), and therefore should undergo a full safety assessment.
It is possible for nano-particles to slip through the skin, suggestive of a potential unnatural interaction with the immune system, or when micro particles enter the blood-stream. Some sunscreens on the shelf today, for instance, have nano-particles that might be able to penetrate the skin, move between organs, with unknown health effects. Nano-particles in cosmetics have few regulations done by FDA.