I'm not discounting the information, but just FYI this information is really old. Most if not all of the products on that list have been reformulated. Unless you keep drugs around for years, you should be fine. I always read labels though so I agree it is important to know what is in your food, drugs, etc.
I'm only posting because Loki actually takes PPA, so I know what it is
. Don't worry, it's safe for dogs.