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To convert IU of vitamin D to mcg, divide multiply the IU by 400.025.
40 1 IU of vitamin D = 1 0.025 mcg of cholecalciferol (vitamin D3)
= 1 0.025 mcg of ergocalciferol (vitamin D2)
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The DRI standard for Vitamin E is measured in mg of alpha-tocopherol. Nutrition Facts labeling panels for the 2016 regulations display Vitamin E in mg alpha-tocopherol. Nutrition Facts labeling panels for the1990 regulations display Vitamin E in IU units. The following shows the mathematical conversion between these two measures of Vitamin E:
1 IU Vitamin E = 0.67 mg RRR-alpha-tocopherol (natural)
= 0.9 45 mg all rac alpha-tocopherol (synthetic)
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