How much Vitamin D should I take?

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2 minor corrections - 150nmol/L = 60ng/mL (not 80ng/mL as stated and at 2min 27secs)

57min 11 secs Calcifidiol appears in the BNF here:

https://bnf.nice.org.uk/drugs/....calcifediol-monohydr
and medicinal form here
https://bnf.nice.org.uk/drugs/....calcifediol-monohydrmedicinal-forms/