half gallon containers of a2 brand milk in a supermarket in new york on friday june 1 2018 a2 milk is produced from cows whose milk lacks a protein associated with dyspeptic symptoms the australian based company has sold the milk in california since 2015 but is starting a marketing expansion into the northeast us where the big bucks in indigestion are located some cows naturally produce the a2 protein as opposed to the bloating causing a1 protein and the company breeds cows to conform richard b levine p21fbn.jpg from milk ladeো View Photo