Despite all the mentioned benefits, the unauthorized and excessive consumption of Vitamin D can be highly dangerous and toxic. Because it is stored in fat, excess amounts are not easily excreted from the body. Vitamin D toxicity leads to "hypercalcemia," or the excessive buildup of calcium in the blood, which causes symptoms such as severe nausea, vomiting, constipation, muscle weakness, and confusion. In more severe cases, this calcium buildup leads to painful kidney stones, kidney failure, and the calcification of heart valves and blood vessel walls, which can result in heart rhythm disorders and irreversible damage. Therefore, high doses should never be taken without a blood test and a doctor's recommendation.
