Vitamin D is a fat-soluble vitamin.
1 International Unit (IU) vitamin D =
= 1 USP vitamin D =
= 0.025 micrograms vitamin D3 (cholecalciferol)
molecular weight vitamin D3: 384.64 grams
molecular weight of vitamin D2: 396.65 grams
1 IU vitamin D3 = 0.065 nanomoles = 65 picomoles
