D is a fat-soluble vitamin that the body can store. It's not like, say, the B vitamins which get washed out of your body pretty quickly. I don't think when you take it makes any difference (though you might want to take it together with food that contains fat for better absorption).
I don't think when you take it makes any difference (though you might want to take it together with food that contains fat for better absorption).
Multiple people such as gwern and Seth Roberts found that the timing makes a difference for them.
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