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by basisword 1714 days ago
Eh as someone also in the UK this seems false. If you check the packaging it will (in my experience) always give you the dose is IU. I know someone recently prescribed Vitamin D, and again, it was a specific dose. If you take it as part of a multi-vitamin dosage may not be made as clear.

The NHS provides some guidance on doses here: https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-...