Dr. Stasha Gominak spent over 20 years as a neurologist running...
LongevityLab@LxngevityLab
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Aug 05, 2026
~3 min read
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Dr. Stasha Gominak spent over 20 years as a neurologist running sleep studies on 100s of patients.
What she uncovered about vitamin D and sleep breaks every rule you've been told (you better take notes):
1. don't take vitamin D...
What she uncovered about vitamin D and sleep breaks every rule you've been told (you better take notes):
1. don't take vitamin D...
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Unless you do this first.
Vitamins act like drugs, and too much or too little will both hurt you.
Get outside, eat fermented foods, and if you do supplement, track your blood levels and keep a log of how you feel.
Vitamins act like drugs, and too much or too little will both hurt you.
Get outside, eat fermented foods, and if you do supplement, track your blood levels and keep a log of how you feel.
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2. vitamin D is a hormone, not a vitamin
Your skin makes vitamin D from sunlight the way it makes any hormone.
Calling it a vitamin back in the 1940s was a naming mistake, and that mistake shaped how we've misused it ever since:
Your skin makes vitamin D from sunlight the way it makes any hormone.
Calling it a vitamin back in the 1940s was a naming mistake, and that mistake shaped how we've misused it ever since:
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3. sleep is run by the brainstem
The brainstem controls your heart rate, breathing, and the paralysis you enter while dreaming.
Vitamin D receptors sit right in the nuclei there that run your sleep cycles and your internal clock:
The brainstem controls your heart rate, breathing, and the paralysis you enter while dreaming.
Vitamin D receptors sit right in the nuclei there that run your sleep cycles and your internal clock:
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4. how D actually works
Vitamin D switches on an enzyme that builds acetylcholine, the brain chemical that carries you into REM sleep and runs your rest-and-digest system.
Starve the brain of it and sleep falls apart.
Vitamin D switches on an enzyme that builds acetylcholine, the brain chemical that carries you into REM sleep and runs your rest-and-digest system.
Starve the brain of it and sleep falls apart.
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5. the level matters, the dose doesn't
She tracked blood levels instead of handing out a fixed pill. Sleep improved once vitamin D climbed past about 60.
Some patients needed 5,000 a day, some needed far more, so she rechecked every month:
She tracked blood levels instead of handing out a fixed pill. Sleep improved once vitamin D climbed past about 60.
Some patients needed 5,000 a day, some needed far more, so she rechecked every month:
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6. your gut makes your B vitamins
All 8 B vitamins are made by the bacteria in your gut.
Fixing D on its own fell short, and pairing D with the B vitamins for about 3 months seemed to reset the microbiome back toward normal.
All 8 B vitamins are made by the bacteria in your gut.
Fixing D on its own fell short, and pairing D with the B vitamins for about 3 months seemed to reset the microbiome back toward normal.
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7. her big hypothesis
Low vitamin D shifts your gut bacteria, cuts your own B vitamin production, and shows up as burning feet, pain, low mood, and broken sleep.
One honest flag, this part is her hypothesis, and mainstream medicine doesn't agree with it yet.
Low vitamin D shifts your gut bacteria, cuts your own B vitamin production, and shows up as burning feet, pain, low mood, and broken sleep.
One honest flag, this part is her hypothesis, and mainstream medicine doesn't agree with it yet.
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8. a pill isn't the sun
Your skin makes a sulfated form of D plus 15 to 20 other compounds when UVB hits it, and none of that comes in a capsule.
Glass blocks it too, so sitting by a sunny window does nothing.
Your skin makes a sulfated form of D plus 15 to 20 other compounds when UVB hits it, and none of that comes in a capsule.
Glass blocks it too, so sitting by a sunny window does nothing.
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9. this exploded in the 1980s
Sunscreen, air conditioning, and computers all landed together, and we moved indoors for good.
She points to that same window when fatty liver, ADHD, and a wave of other conditions started climbing.
Sunscreen, air conditioning, and computers all landed together, and we moved indoors for good.
She points to that same window when fatty liver, ADHD, and a wave of other conditions started climbing.
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If nothing's wrong with your sleep, her advice is simple.
Get more sun, eat fermented foods, and skip the pills.
The supplements are for people trying to climb out of a hole.
This is educational only, not medical advice.
Get more sun, eat fermented foods, and skip the pills.
The supplements are for people trying to climb out of a hole.
This is educational only, not medical advice.
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Shout out to The Diary of a CEO podcast and the insane value it provides to the whole planet.
Truly one of the best podcasts online.
Truly one of the best podcasts online.
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We're the largest longevity-focused page across socials, so if you want daily, verified content on health and longevity, make sure to drop a follow at @LxngevityLab
See you on the next one.
See you on the next one.
LongevityLab@LxngevityLab
Dr. Stasha Gominak spent over 20 years as a neurologist running sleep studies on 100s of patients.
What she uncovered about vitamin D and sleep breaks every rule you've been told (you better take notes):
1. don't take vitamin D...
What she uncovered about vitamin D and sleep breaks every rule you've been told (you better take notes):
1. don't take vitamin D...