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What are the side effects of taking too much vitamin D?
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Possible side effects of taking too much vitamin D can include nausea, vomiting, weakness, dizziness, constipation, increased thirst and urination, headaches, and loss of appetite. In rare cases, too much vitamin D can lead to an abnormally high blood calcium level, a condition called hypercalcemia. This can cause further symptoms such as confusion, disorientation, and heart rhythm abnormalities.