A2 milk is different from regular milk. Regular milk contains two main proteins: A1 and A2, while A2 milk only contains A2 protein. This protein difference may affect digestive health. Many people have lactose intolerance, but recent studies show that other components in milk may also cause digestive discomfort. A2 milk is rich in protein, omega-3 fatty acids, and calcium, which help prevent and treat osteoporosis, maintain healthy blood pressure, improve mood, strengthen the immune system, and protect eye health. However, if you are lactose intolerant, lactose-free milk might be a better choice.