a2 Milk is the leading Australian premium brand of cow's milk that launched in the U.S. in 2016. Ordinary cow's milk contains two types of proteins, A1 and A2. Many people are sensitive to the A1 protein, which can lead to a misdiagnosis of lactose intolerance. By sourcing only from cows that naturally lack the A1 protein, a2 Milk is able to produce cow's milk that is easy to digest.