We can't eat raw potato either
About the milk, i remember seeing that it is ok on rare occasions and i was also advised that soy milk should be used over other milk, my hammies never minded it.
about the herbs, many herbs are toxic to us humans in large quantities, so maybe be cautionary. However, many of the foods/treats from P@H have herbs in don't they? Like basil. Parsley is also ok, otherwise surely they wouldnt sell
Dental Chew n Treat with Alfalfa and Parsley Stuffing by Petbrands | Pets at Home
also, things like parsnips, do these need to be cooked or can they be eaten raw? (or is it the same as potatoes?)