Paul Saladino· MD
if you arrive this time of year with a vitamin D below 30 or even below 40, you're probably going to need to supplement vitamin D in the winter, which I think is fine, but it would have been better to get it in the summer.
The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
if you arrive this time of year with a vitamin D below 30 or even below 40, you're probably going to need to supplement vitamin D in the winter, which I think is fine, but it would have been better to get it in the summer.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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the level of vitamin D was insufficient in the middle of the winter season, but also after the summertime.