From what I've read, Castoreum is (a) prohibitively expensive and (b) banned all over the world, so the chances of finding it in your ice cream or any other foo

From what I've read, Castoreum is (a) prohibitively expensive and (b) banned all over the world, so the chances of finding it in your ice cream or any other food are zero. Not that said food will be lacking other equally tasty ingredients.