International Units (IUs)

On food labels, vitamins A, D, and E are sometimes reported in milligrams or micrograms and sometimes in International Units (IUs). Even more confusing, the term International Unit has a different meaning for each vitamin.

To clear up this perplexity, here are links to precise definitions and conversion factors:

• International Units of Vitamin A
   

• International Units of Vitamin D
   

• International Units of Vitamin E
   

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Last Modified: 7/1/07