TiO₂ supplies all of our white.  Paint, toothpaste, doughnuts.

https://twitter.com/cstross/status/1009774992668659712

«Holy crap: Type II diabetes associated with accumulation of pigment-grade titanium dioxide nanocrystals in the pancreas (replacement for earlier lead carbonate white pigment). Pilot study: if statistically significant studies support this, it’s dynamite.»

https://pubs.acs.org/doi/10.1021/acs.chemrestox.8b00047