The mineral is very effective for some uses. However, many uses have only a little scientific evidence in their favor, and some have almost none at all (see Does Calcium Work? for more information).
Because it has been studied quite a bit, good information about calcium dosing is available. For some of the less studied uses, the most effective (and safe) doses have not yet been established. Adequate Intakes (AIs) and Tolerable Upper Intake Levels (UL) have been established for the mineral.
(Click Calcium Dosage for more information.)
Some people think that vitamins or minerals are naturally free of side effects. However, this is simply not the case. This supplement has been reported to cause various side effects, including (but not limited to):
(Click Calcium Side Effects to learn more, including any potentially serious side effects that you should report immediately to your healthcare provider.)
Calcium can potentially interact with a number of different medications (see Calcium Drug Interactions).