01/11/2025
Vitamin Conversions – International Units (IU) to mg or mcg
When you look at a food label, you might be confused at the variety of different measurements used to indicate how much of each vitamin is in that food. You’ll find terms like mg, mcg, IU and more. Why are there a variety of different terms used, and how do you convert between these different units?
International Units (IU) are one of the standardized units used to calculate or measure vitamin potency and biological effectiveness. IUs are preferred rather than weight for many vitamins, because different vitamin forms can have different levels of potency. IUs provide a standardized way to calculate a vitamin’s potency across different vitamin forms.
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International Units (IU) are used to measure vitamin potency. The formula for converting vitamin IU mg or mcg depends on the vitamin form being measured. Find common vitamin calculations here.