1, 400iu vitamin d is equal to 0.0 1 mg. IU is an international unit, and the dosage of vitamin D preparations is 400IU, that is, 10 microgram, that is, 400 international units.

2. Vitamin D(vitaminD) is a sterol derivative, which has anti-rickets effect, also known as anti-rickets vitamin. At present, it is considered that vitamin D is also a steroid hormone, and the most important members of vitamin D family are VD2 (ergocalciferol) and VD3 (cholecalciferol).

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