Comment by op00to
There are some differences between dairy in the US and elsewhere. US dairy cows produce milk containing A1 beta-casein, a protein that some studies suggest may cause digestive discomfort. In Europe, cows often produce A2 beta-casein milk, which some people find easier to digest.
Dairy products in the US tend to contain more lactose, and French/Italian dairy products have less due to the prevalence of aged cheeses and fermentation.
There are many other differences, and none of these seem related to some sort of mystery-makes-you-shit-yourself additive.
A2 is starting to be a thing in the US.
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