The IU is the International Unit (IU).
An IU is a unit of activity that indicates the amount of activity of an enzyme or vitamin.
When a substance is first developed, a unit that has a constant medicinal effect is determined in units of 1, regardless of its weight, and then the molecular structure of the substance is determined to determine its molecular weight and correlate its weight with its inverse.
Simply put, IU is a unit of medicinal efficacy and mg is a unit of weight.
The nutrients that are using this unit are vitamins A, D, and E.
Source: http://m.blog.daum.net/hanjeongeun/56
As my superiors told me, I didn't know the molecular weight at first, so I couldn't decide the weight, so I decided the unit based on the medicinal effects.
Currently, we have decided how to change IU to mass as below.
Insulin: 45.5 gg
Vitamin A: 0.3 gg
Vitamin C: 50 gg
Vitamin D: 0.025μg
Vitamin E: 1 mg
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