More and more of the unpronounceable ingredients within our pre-packaged food supply come from China. A lot of whey (which is pronounceable) is apparently sourced from China, too. "Made in USA" isn't what is appears at first glance.
As far as I can tell, the only US food manufacturers who really give a crap are the ones whose target consumers are convinced that God Himself cares what they put in their bodies, and they have a rabbi in China -- actual China -- whose job it is to track every ingredient to its source. And if he's not convinced or happy or if he cannot ascertain what that source really is, then they don't buy it.
When it comes to the stuff that has gotten into our human food and pet food that has its source in China, I think other American companies are put off by language and cultural barriers, for one thing, and their lust for corporate profits, for another.
My source: Los Angeles Times several years ago.
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it's the only thing that ever does. ~Margaret Mead~