Rhonda Patrick· PhD
Vitamin D, acting like a hormone, is found in reproductive tissues, including Leydig cells (where testosterone is made). Deficiency correlates with lower testosterone levels.
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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.
Vitamin D, acting like a hormone, is found in reproductive tissues, including Leydig cells (where testosterone is made). Deficiency correlates with lower testosterone levels.
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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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