I read the opposite on Nano particles, basically anything on your skin can be absorbed into your skin not to mention breathed in, such as when use a tissue and some of your make up, even a small amount gets transfered into your nose and inhaled.I know this sounds weird, but titanium oxide is in nearly every mineral powder, and is harmful! if this gets into your lungs its not good at all but do you own research, be prepared for a shock, I was.