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Vitamin D (conversion of units)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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  • dose conversion:
    • the dose of vitamin D in micrograms can be calculated by dividing the number of international units by 40 e.g. 400 iu is equivalent to 10 mcg
      • Vitamin D2 (ergocalciferol) and vitamin D3 (colecalciferol) are considered equal in potency
        • although there are suggestions that the onset of action of vitamin D3 is quicker


  • 1) Drug and Therapeutics Bulletin 2006; 44(4):26-9.

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