The tractor supply here don't have it, but I can order a gallon online and they will send it for free to that store. It say's feed grade for animals only, but there is only 2 grades so it's the same stuff.
The good old USDA lets farmers leave some many parts bugs in food, so I'm 100% pharms making the PG makes it to a higher then the USDA % of bug standard. I worked on farms when I was young, and you should see some of the food they shipped for human use.
Some had rats and bugs that was for catchup, the farmer said it don't matter for that at all. Cheap hotdogs and stuff most likely got some pretty bad stuff in them, the store veggies are nothing like fresh farm veggies I will tell you that. I almost never get store veggies, no flavor to them at all but I do use catchup though.