Isn't casein what mercury toxic people have to avoid? Or is it something else in the milk/cheese that reacts with mercury? Casein in cows milk is the one that a lot of people have trouble with (not just mercury toxic people), but are ok with goats. But isn't goats casein also said to be bad for mercury toxicity?

And if the whey is okay to be consumed with mercury toxicity, then other whey based dairy products aswell?