How to treat wry neck?

Sorry for the dumb question but what does IUs stand for?

International Unit
This acronym stands for 'International Unit'. But unlike MG or MCG, it is not a physical unit of measurement, referring to a particular mass or volume that you might literally see or feel. Instead, IU measures something less obviously tangible: a particular product's biological activity or potency.
Source:
https://www.tonichealth.co/blogs/ne...onal,product's biological activity or potency.
 

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