Andrew Huberman· PhD
the massive amounts of serotonin made in the gut do not cross the Blood Brain Barrier.
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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 massive amounts of serotonin made in the gut do not cross the Blood Brain Barrier.
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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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You may have heard that the majority of serotonin in your body is made in your gut, and indeed, that's true, but I hate to break it to you, the serotonin in your gut is not responsible for your feelings of love and attachment, at least not to a high degree. That's mainly going to be the reflection of neurons in your brain that make serotonin.