Would love to see info published/discussed about the above topic title. I’ve been informed about how most dog food companies use synthetics that are *usually* from China or India. There are only a handful that have whole food vitamins. For instance, sodium selenite used for selenium, is derived from drain cleaner and lye. There was a great article in Dogs Naturally magazine that blew my mind. Never knew about the premixes before. Quite a lot of food allergies, the article stated, are actually not from any one food but from the chemicals used in the vitamin/mineral premixes. Good to know.