A2 gir cow milk is milk that comes from cows that produce milk with the A2 type of beta-casein protein. The A2 protein is different from the A1 protein found in most cow's milk. Some people who are lactose intolerant or have difficulty digesting cow's milk may find that they are able to tolerate A2 milk better. However, it's important to note that more research is needed to confirm these potential health benefits. Additionally, A2 milk can be more expensive than regular cow's milk.