Peoples tolerance of dairy can vary considerably and it's certainly not right for everyone. To test your own tolerance levels, try taking dairy out for at least a week and notice how you feel. For people concerned about their calcium intake, there are plenty of foods that have high levels of calcium, such as seafood (i.e., oysters and sardines) and leafy green vegetables. After your dairy free period, start to re-introduce it, one group at a time and observe how you feel and function. Butter and ghee are the most commonly tolerated sources of dairy.