Andrew Huberman· PhD
The first principle is that different hairs on your body, including the hairs on your scalp, have a growth phase of different duration.
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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.
The first principle is that different hairs on your body, including the hairs on your scalp, have a growth phase of different duration.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
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.
So the anagen or the growth phase for hairs on the head, as I mentioned earlier, is anywhere from 2 to 8 years. For most people, it's going to be about six years.
But chances are the stem cell population in that particular eyebrow follicle for that one eyebrow hair is longer than it is for the others.