Vitamins and Minerals are super interesting so here is a little bit to start with...
1. Where can I find it? - dark green vegetables
2. What does it do? - it is involved in muscle contraction
3. What if I get too much? - can result in constipation
4. What if I don't get enough? - can result in muscle stiffness/cramps (similar to Magnesium deficiency, in fact, if Calcium is actually too HIGH and Magnesium is too LOW)