Andrew Huberman· PhD
your hair grows faster in longer days. That too is triggered by UVB exposure, not just to the skin, but to the eyes.
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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.
your hair grows faster in longer days. That too is triggered by UVB exposure, not just to the skin, but to the eyes.
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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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It is known that turnover of hair cells. The very cells that give rise to hair cells are called stem cells. They live in little so-called niches in our skin with these hair stem cells and your hair grows faster in longer days. That too is triggered by UVB exposure. not just to the skin but to the eyes.