After that, they may ask you to take 3,000-6,000 IU of vitamin D3 a day. Children with a vitamin D deficiency will usually get 2,000 IU a day for about 6 weeks until their vitamin D levels in the ...

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of vitamin D2 or D3 by mouth once a week for eight weeks, or 6,000 IU daily followed by a maintenance dose of 1,500 to 2,000 IU of vitamin D3 daily. Keep in mind that higher doses will be needed to ...

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Vitamin D comes in two primary forms: vitamin D2 and vitamin D3. Vitamin D2 (Ergocalciferol): This form is obtained from plant sources and is commonly used in prescription supplements. It's also added ...