Dangers of Vitamin D  from Wagner and Holis 2008
As early as the 1920s, reports of vitamin D toxicity surfaced. 78–80 Individuals were prescribed or given hundreds of thousands of international units of vitamin D that resulted in the classic symptomatology of toxicity within weeks: anorexia, nausea/vomiting, weakness, fatigue, lassitude, polyuria/polydipsia, and nocturia. Laboratory parameters showed hypercalcemia, acute and/or chronic renal failure, and variable degrees of hyperphosphatemia. 81,82 Excessive calcification of the epiphysis and metaphysis and extramedullary calcifications were found on radiographs. 81,83 Harris and Innes, 79 Harris and Moore, 84 Ham and Lewis,85 and others reported thathypervitaminosis D was a real and reproducible entity that could be replicated in the laboratory using rat and rabbit models. Investigators gave pharmacological doses to rats, which were similar to the amounts prescribed or given to some children and adults. 79 Since that time, reports of vitamin D toxicity have occurred—in each case involving ingestion of hundreds of thousands of international units of vitamin D taken for weeks to months. 83,86 An excerpt from Debré86a gives us a glimpse of the dosage that causes such toxicity: “What are signs by which one can make a prognosis? The total dosage of the drug is not the main factor. However, it is true that the children who died (at age of 20 and 16 months) had received respectively 11,200,000 and 18,200,000 units. The mild cases occurred when only 3,000,000 to 6,000,000 units had been given.” Clearly, these children were given pharmacological doses of vitamin D and not doses within the physiological range. 69,70,72,86b

Not a problem with vitamin D, but actually William Syndrom if get dose is well in excess of 10,000 IU/day