https://www.theatlantic.com/health/archive/2013/03/how-we-re...
Probably, meat.
http://www.popsci.com/what-are-microbeads-and-why-are-they-i...
I suspect that certain combinations of seemingly safe chemicals cause cancer only if used together.
https://www.theatlantic.com/health/archive/2013/03/how-we-re...