As said earlier, overdose or wrong intake of minerals can end up causing more health issues than cure. Some of the common problems the user may face include tooth staining, stomach bleeding, increased urination, confusion, limp feeling, muscle weakness and uneven heart rate. At the same time, some serious side effects can be migraine, prolonged headaches, unpleasant taste in the mouth and stroke. Therefore important is to consult an expert before using any minerals or multivitamins.