Andrew Huberman· PhD
Topically, the caffeine enters the scalp and crowds out-- somewhat crowds out the androgen. It is a weak effect. It's likely just strong enough to be clinically significant.
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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.
Topically, the caffeine enters the scalp and crowds out-- somewhat crowds out the androgen. It is a weak effect. It's likely just strong enough to be clinically significant.
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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.