Why is IU used in vitamin labeling? Understanding International Units
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4 min read
The use of 'IU' or International Unit on vitamin labels was established in the early 20th century to standardize the potency or biological activity of certain vitamins and other medicinal substances globally. This unique measurement system was created because some vitamins, like Vitamin D, come in different forms with varying levels of effectiveness, making a simple weight measurement unreliable.
