Excess Vitamin D

Definitions & Key takeaways

Excess vitamin D or hypervitaminosis D refers to the toxic effects of overconsumption of vitamin D. It can cause too much calcium to be absorbed from the intestines, leading to a buildup of calcium in the blood (hypercalcemia). This can damage the heart, kidneys, and other organs. Symptoms of excess vitamin D include nausea, vomiting, weakness, and stupor.