Carbon nanotubes, while mostly being used in electronics and things like body armor show great potential for cancer treatment and bone healing.
The concern for medical uses are because they are structurally similar to asbestos. Not a good look right?
Science Daily reports on research showing nanotube’s toxic properties can be removed using chemical treatments to change their surface and by shortening them.
These treatments would also enable modified tubes to transport materials directly into the cytoplasm of cells. Very useful.
Reference:
Chemistry resolves toxic concerns about carbon nanotubes, experts say