One of the main problems with an issue like this is that the vendor usually isn't "manufacturing" anything. They are combining ingredients that they have sourced from another location. The recipe may be theirs, but the recipes for the constituents are not. If they are using commercial flavorings, that information may or may not be available to them. This is why test results are necessary, if this concerns you.Manufacturers of a product that is distributed to the masses has to bear some form of responsibility. At the very least, they should know what is in their product. Shouldn't matter what the product is. A very simple question along the lines of "what does your product contain?" Should be followed with a very simple response.
I don't favor mandatory testing for "potential risks."
If the potential risk concerns you, ask for test results, if you don't get them, don't buy.