Huberman Lab · 2026-07-27 · Andrew Huberman (host), Anthony Richards, Sarah, Van Spina, Josima, Nick Ferendo, Kelly, Kevin
Your Top Health Questions Answered
52 research-tied claims examined: 1 contradicted 3 overstated 1 context 43 supported 4 unverified
4 No source found (not proven false)
Alpha-GPC supplementation has been shown to modestly increase REM sleep or not hinder REM and slow-wave deep sleep.
"Alpha-GPC is also one of the few supplements that I'm aware of that can increase the amount of rapid eye movement sleep that you get, REM sleep." (said at 0:03:05)
No published record matching the claim that Alpha-GPC supplementation increases rapid eye movement (REM) sleep was located; this does not prove the claim false.
Approximately 85% of vagus nerve fibers are ascending sensory fibers, while roughly 10% to 15% are descending motor/efferent fibers.
"Everyone thinks about the vagus nerve like sensory information coming up from the body. That's 85% of the vagus pathway. The other 10 to 15%, no one knows the exact numbers, comes from the brain down to the organs of the body." (said at 0:07:49)
No published record matching the claim that approximately 85% of vagus nerve fibers are ascending sensory fibers and roughly 10% to 15% are descending motor/efferent fibers was located among the retrieved literature; this does not prove the claim false.
The suprachiasmatic nucleus integrates the total amount of photon/light energy received across the previous two to three days to set circadian timing.
"your suprachiasmatic nucleus, your brain's central circadian master clock that organizes all of this, is literally integrating the number of photons that you saw, light energy, in the previous two or three days." (said at 0:19:17)
No published record matching the claim that the suprachiasmatic nucleus integrates the total amount of light energy received across the previous two to three days was located; this does not prove the claim false.
Noxious odor detection operates via a distinct, hardwired neural pathway separate from general olfaction that preserves the ability to detect noxious smells even when general olfaction is compromised.
"Let's avoid noxious smells. And I'll tell you why you can avoid noxious smells in this because there's a hardwired pathway for that. You never you actually never uh lose your core ability to detect noxious smells unless you've had some damage to the olfactory system. It's a different pathway." (said at 0:47:47)
No published record matching the claim that noxious odor detection operates via a distinct, hardwired neural pathway separate from general olfaction that preserves the ability to detect noxious smells when general olfaction is compromised was located; this does not prove the claim false.
Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.