3 ms·Buttermilk you buy in the store bears little relation to the buttermilk you get from churning butter.by empath75 7y agoButtermilk you buy in the store bears little relation to the buttermilk you get from churning butter.jacobr1 7y agoAnd is also a different product in the US vs EU.phonypc 7y agoSame difference, isn't it? In the EU buttermilk usually refers to the by-product of butter making. In the US and Canada it's commercially produced cultured milk.