Have you tried A2 cheese from European or Australian cows?

My wife has a problem with A1 milk/cheese (which is all the milk/cheese produced by US Holstein cows). It seems they have a genetic defect that turns one amino acid into a histidine, which your body turns into a histimine. https://www.drlaurendeville.com/articles/dairy-europe/

My wife can't tolerate US dairy, it gives her black eyes and some nausea. When vacationing in Australia she could have real cream in her coffee and eat all the cheese she wanted with no problem. When we got home I did the intensive investigation, tried a few things out, and it turned out to be A1 dairy.

Now we buy cheese imported from Europe and she has no problems with it.

Bob