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.
So already, right off the bat, you can see that vitamin D is doing something very different than what we would think of as just a vitamin where you need a cofactor to have an enzyme do A to B. It's much more nuanced than that.
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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.
And what I mean by a steroid hormone, most people think about estrogen, testosterone, those are steroid hormones. Like imagine if 70% of the you know, of men in the United States were deficient in testosterone, like they would be terrible. So, you know, vitamin D is is is basically very different because it basically can enter what's called the cell the nucleus of a cell. And that is where all your DNA is. And it can basically recognize this little sequence of DNA. And it it's it basically, you know, binds to a receptor. And, you know, it binds to your DNA and turns genes on, activates them and turns other genes off and deactivates them in this like coordinated fashion. And these are genes that are important from everything from brain function. So serotonin is one. It's important for the synthesis of serotonin in the brain to immune function. And it's it's why vitamin D plays such a critical role in helping prevent respiratory diseases.
it's actually converted into a steroid hormone. That means that it goes into the nucleus of our cells and interacts with our DNA and it activates genes that are important and it deactivates genes that are important for uh in terms of the timing of this activation and deactivation.