Have you heard of A2 milk? What type of milk do you use?

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I've decided to try a variety of milk called A2 milk which is gentler on the tummy. It's still natural milk from cows, but from a variety that gives milk with slightly different protein composition. It's not lactose free or a milk substitute. I decided to switch as my tummy seemed to have a lot of random rumblings! It's more expensive though. What kind of milk do you consume?