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