Yes, but only very small amounts of nanomaterials can be taken up via the gastro-intestinal tract by penetrating tissue deeper layers and entering the blood stream. However, the overall amount is very low and most of the particles are not synthetic ones. Many minerals and other substances have a size range of about 1 to 100 nm, thus, our gastro-intestinal tract is very well adapted to handle such materials.

 

 

 

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