Bryan Johnson· Author
If UV-mediated hormonal support is the goal, moderate sun exposure to large skin surfaces with standard precautions, combined with optimizing your vitamin D levels, is where the actual evidence points.
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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.
If UV-mediated hormonal support is the goal, moderate sun exposure to large skin surfaces with standard precautions, combined with optimizing your vitamin D levels, is where the actual evidence points.
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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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