You must have come across a popular adage that conveys that excess of everything causes problems. The same stands true for important supplements as well. While we consume them without a proper certified prescription, assuming that one pill of calcium or vitamin D won't do any harm to the body, the reality is it can have a much more dangerous effect on the body later.
For example calcium, which is essential for strong bones, teeth, and the proper functioning of muscles and nerves can prove to be a threat for the heart.