Costco A2 milk comes from cows that have been bred to produce milk with only the A2 protein, which is believed to be easier on digestion. The cows are specially selected for optimal health and are given a healthy diet of grass, hay, vitamins and minerals. They also receive regular veterinary care and their milk production is monitored closely. The milk is then sourced from farms in Australia and New Zealand located close to Costco stores so that it can reach customers as soon as possible after being processed in hygienic conditions.