Rhonda Patrick· PhD
Supplementing with vitamin D2 reduced the primary circulating form of vitamin D3 by ~18 nmol/L (7 ng/mL), which is enough to move from sufficient to an insufficient range.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Supplementing with vitamin D2 reduced the primary circulating form of vitamin D3 by ~18 nmol/L (7 ng/mL), which is enough to move from sufficient to an insufficient range.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
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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