Why would beef tallow (rendered beef fat) have milk proteins in it? Only milk or dairy products should have milk proteins (casein and whey). Am I missing something here? (I admit to sometimes being a Nerdlinger McStupid.)
Some peple have allergic (or other) reactions to beef, but if you can eat beef, I cannot for the life of me see why you wouldn't be able to tolerate tallow. Conversely, I would expect that a person who has a problem with beef to possibly also have a problem with tallow.