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>In most countries

You claim this based on what data?



It's the same 20-25ug daily for adults in all the major western sources: EFSA, NIH, NHS, Mayo, Harvard. Yes, there are recent studies (2020s) suggesting it should be higher and likely the RDA will rise, but you should really be taking vit K with it for proper utilization.

https://www.hsph.harvard.edu/nutritionsource/vitamin-d/


It's 5 and 10 in AUS/NZ, 15 in Canada, 10 in the UK, 15 in the EU, 10 in Sweden, 20 in France, etc. for normal adults




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