How much calcium shoudl I be taking?

1200 mg daily. A good rule of thumb for adults is 1200 mg daily plus what you take in with meals. Calcium supplements usually come in 600 mg tablets and you take one twice daily. They may contain vitamin d in the amount of 400 units each as well, though you can get them without the vit. D. Pending your age, risks, medical conditions etc, you should be safe. If quesitons, ask your pcp about you in particular.