<human>:  What are the side effects of taking too much vitamin D?
<bot>: 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.