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.
But the other would be that there's been a variety of studies now over the years showing if you just randomly take different vitamin D supplements off the shelves like Walgreens, you know, in grocery stores, that the actual concentration of vitamin D3 in each supplement varies so widely that you'll often get a supplement that says it's, you know, 4,000 IU, but it's more like 400 IU.
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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.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
So it is good to like kind of find some go-to reliable brands. Maybe third-party sites have tested the concentration of the vitamin D3.
the actual concentration of vitamin D3 in each supplement varies so widely that you'll often get a supplement that says it's, you know, 4,000 IU, but it's more like 400 IU.
Maybe third-party sites have tested the concentration of the vitamin D3. I know Labdoor does one, and then ConsumerLab, they actually go around and test the actual concentration of whatever active ingredient, in this case, vitamin D3 in a variety of pretty, you know, readily available supplements.