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Measurement Frequently Asked Questions (FAQ)

Convert International Units (IU) to Milligrams

How do I convert from International Units (IU) to grams or milligrams?

IU stands for "International Units" and is usually used in the measurement of vitamin potency. There is no fixed definition for IU, as there is for grams or milligrams. The actual definition of IU depends upon the specific substance that you are measuring. For example, 1000 IU of Vitamin A has a different mass (weight) than 1000 IU of Vitamin E.

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