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Endogenous VDT may develop from excessive production of an active vitamin D metabolite – 1,25(OH) 2D in granulomatous disorders and in some lymphomas or from the reduced degradation of that metabolite in idiopathic infantile hypercalcemia. Serum 25-hydroxyvitamin D concentrations higher than 150 ng/ml (375 nmol/l) are the hallmark of VDT due to vitamin D overdosing. Exogenous VDT is usually caused by the inadvertent or improper intake of extremely high doses of pharmacological preparations of vitamin D and is associated with hypercalcemia. Many forms of exogenous (iatrogenic) and endogenous VDT exist. Although VDT is rare, the health effects can be serious if it is not promptly identified. VDT and its clinical manifestation, severe hypercalcemia, are related to excessive long-term intake of vitamin D, malfunctions of the vitamin D metabolic pathway, or the existence of coincident disease that produces the active vitamin D metabolite locally. 4Department of Biomedical and Molecular Sciences, Queen's University, Kingston, ON, CanadaĬonfusion, apathy, recurrent vomiting, abdominal pain, polyuria, polydipsia, and dehydration are the most often noted clinical symptoms of vitamin D toxicity (VDT also called vitamin D intoxication or hypervitaminosis D).3Department of Biochemistry, Radioimmunology and Experimental Medicine, Children's Memorial Health Institute, Warsaw, Poland.2Department of Biochemistry and Clinical Chemistry, Medical University of Warsaw, Warsaw, Poland.1Department of Geriatrics, Medical Centre for Postgraduate Education, Warsaw, Poland.Ewa Marcinowska-Suchowierska 1 *, Małgorzata Kupisz-Urbańska 1, Jacek Łukaszkiewicz 2, Paweł Płudowski 3 and Glenville Jones 4