Honestly, I don't worry about that stuff. Seems like every time they come up with a public scare about some chemical in a food or shampoo or whatever, and they get everybody to stop buying, it later turns out to be all about patent rights and corporate warfare. Remember the big scare about deodorants causing lymph cancer? They proved that yes it was true, but you'd have to use something like 800,000 gallons of deodorant every 8 minutes for 70,000,000 years, or something like that.
So if I get some kind of bizarre illness and die from using good old-fashioned soap in the shower, at least I'll smell good for the morticians.
Charles