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.
First of all, the growth factor IGF-1, insulin growth factor 1, which is produced by the liver, but that receives stimulation from the brain and pituitary to be released, is a strong regulator of hair growth. We can think of it as the accelerator on hair growth. It does that by extending that anagen, or growth phase, for longer.
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.
Androgens such as testosterone and its derivatives, such as dihydrotestosterone, which will be much the topic of what we're getting into next, inhibit IGF-1 and cyclic AMP. Again, androgens such as dihydrotestosterone inhibit, prevent the action of IGF-1 and cyclic AMP, which you just learned a few moments ago, act to extend the anagen or growth phase of hair.