Check this product out. It's made in a chinese guy's garage in northern california using equipment he imported in 2014.
It doesn't have legitimate GMP or FDA licensing.
This is the kind of problem we are talking about.
And the issue is worse than it appears, just as toast0 mentioned, because the same exact product with same product page and AMAZON barcode, NO UPC, is also in the online walmart marketplace now! Amazon so controls the market that the other companies just do whatever amazon does. This is a literal antitrust situation we are in- sherman act violations.
There are international food products on amazon marked "made for/picked exclusively for amazon". That's a violation of the FTC act. We are in a situation where our government is failing to regulate.