A closer look at casein
Casein is milk protein. There are multiple types of casein, including A1 and A2. A1 protein is particularly hard to digest and can cause symptoms such as acne, eczema, stomach pain, and constipation.
A1 protein is high in most cow's dairy, but it's lower in goat's, sheep's, camel's, and Jersey cow dairy. You can also buy A2 milk, which has the A1 protein removed. If you suspect you may have a casein intolerance, try switching to A2 milk or alternative low-caesin dairy options such as goat's, camel's, buffalo or sheep's dairy.