IU stands for Internation Unit, which is a unit of measurement. However it is based on the affect not a actual measurement. It is commonly used in pharmacy for some medication, vaccines, vitamins and hormones. The amount of the IU is regulated by an internation agreement for each substance. It is monitored by the Committee on Biological Standardization of the World Health Organization.
The thing to remember is that 1 IU of vitamin B is not going to be the same as 1 IU of vitamin E.
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