The main complication of vitamin D toxicity is hypercalcemia, which is higher-than-normal levels ... D2 (ergocalciferol) and D3 (cholecalciferol). D3 might raise blood levels of vitamin D higher ...

However, 800 to 1,000 IU is the dose that may have a better chance of giving a patient a normal vitamin D level. In some countries, vitamin D is listed in micrograms, and the relationship is as ...