This article comments on the possible dangers of nano technology in cosmetics in a simple and understandable way.
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The argument is that nano particles could penetrate the skin and enter the body passing into organs where there accumulation could cause problems. The argument is that this might even be true for very small particles of material we already know.
Companies are already using nano technology to move gold and silver particles into the small structures of the skin claiming that they carry no risk. However, there are others who point out that there is no proof of safety and a wait and see attitude should be used.
I would support this in food – its already complex enough lets not further complicate it before we are sure of nano technology’s consequences.