With an ongoing debate about the nutritional value and effects of A1 and A2 milk, a bunch of companies has laid out some research findings and studies concluding with the harm induced by A1 milk while enumerating the benefits of A2 milk. Casein dominates a large part (80%) of the total protein content in milk. The milk is made up of several kinds of casein of which, beta casein is the most common. A1 beta casein is found in cows originating in the US, New Zealand, Australia, and Northern Europe, while A2 beta casein appears in the milk produced by traditional cows found in India and Africa. >>>