How do I convert the potency of a vitamin expressed in International Units (I.U.) to g or mg (and vice versa)?

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How do I convert the potency of a vitamin expressed in International Units (I.U.) to g or mg (and vice versa)?

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Alex

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A. The USP has discontinued the use of International Units and now specifies the potency of vitamins in terms of metric mass units such as μg or mg. The following table shows the conversions. Vitamin A, 1 I.U. = 0.3 μg all-trans retinol ” 0.344 μg all-trans retinyl acetate ” 0.55 μg all-trans retinyl palmitate Vitamin D, 1 I.U. = 0.025 μg ergocalciferol or cholecalciferol Vitamin E, 1 I.U. = 0.91 mg d,l-alpha tocopherol ” 1.0 mg d,l-alpha tocopheryl acetate ” 1.12 mg d,l-alpha tocopheryl acid succinate ” 0.67 mg d-alpha tocopherol ” 0.74 mg d-alpha tocopheryl acetate ” 0.83 mg d-alpha tocopheryl acid succinate Beta carotene, 1 I.U. = 0.6 μg of all-trans beta carotene back to top Q.

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