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The Diary of a CEO with Steven Bartlett · July 27, 2026 · 2h 0m

Vitamin D Expert: The Supplement World Is Giving The WRONG Advice!

Dr. Stasha Gominak

Neurologist Dr. Stasha Gominak explains her controversial theory that widespread sleep problems stem from a hidden vitamin D deficiency combined with B-vitamin depletion. She argues that the skin's own production of vitamin D is irreplaceable, and that routine supplementation without proper monitoring may worsen sleep. Drawing on her two published papers and her RightSleep method, she connects the rise of conditions like ADHD, depression, and diabetes to a shared root in indoor living and gut microbiome disruption.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Curious

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Insomnia as a chemical deficiency, not a behavioral problem00:00:00
Gominak views insomnia as a consequence of a hidden vitamin D and B vitamin deficiency rather than poor sleep habits.
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Novel

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Vitamin D alone can deplete B vitamins and worsen sleep00:00:00
Taking high-dose vitamin D without sufficient B vitamins can burn through B vitamin stores, leaving people with worse sleep.
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Highlights

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Skin production of vitamin D is irreplaceable00:00:00
Gominak argues that the skin’s natural synthesis of vitamin D from sun exposure cannot be matched by oral supplements or dietary vitamin D.
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Gut bacteria produce essential B vitamins00:00:00
Gominak explains that the gut microbiome is a major source of B vitamins, and an unhealthy gut can lead to B vitamin shortfalls.
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Rise of ADHD, depression, fatty liver and diabetes linked to indoor shift00:00:00
Gominak points to a common timeline connecting the emergence of several chronic conditions with the population’s move indoors and loss of sun exposure.
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Supplements are biohacking and as risky as drugs00:00:00
Gominak frames unsupervised supplementation as a form of biohacking that carries risks comparable to prescription medication.
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Misc

✧Gominak describes her own experience of taking vitamin D alone, which led to worse sleep, fueling her investigation.
✧She draws a timeline linking the rise of chronic conditions to the shift toward indoor living and away from sun exposure.
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