If you’re dealing with hair loss, this episode focuses on what William calls the most overlooked issue: nutritional hair loss—and how diet, lifestyle, blood levels, and even medications can quietly be the “one little tiny detail” that prevents results. He argues that outside of genetic/DHT-driven loss, hair loss can often be controlled through diet and lifestyle, but the modern world tends to create more and more nutritional problems that make hair loss worse.
A major theme is stop guessing and get blood work. William explains that people can be doing “everything right” (including DHT blockers, topicals, low-level laser therapy, minoxidil, and even PRP) and still get no results because they never addressed key blood levels—especially Vitamin D3 and iron status.
He recommends, as a general rule for nutritional hair loss, checking:
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Vitamin D3 blood level
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Ferritin (“feradin”) and serum iron
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Zinc blood level
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Blood type (and eating “in accordance to” it, referencing the book Eat Right for Your Blood Type)
The transcript then goes deeper into why these levels matter and what can drive them down. He states that a large portion of the population is Vitamin D3 deficient, discusses why (being indoors, sunscreen, northern climates, and melanin/darker skin), and gives a “trichological range” goal of at least 60 ng/mL. For ferritin (iron storage), he calls it one of the most overlooked issues—especially for menstruating women, and he gives a target of at least 70 ng/mL, and recommends above 100 ng/mL for O or B blood types. He also explains zinc testing and notes gut issues and certain dietary factors can interfere with absorption.
He also calls out common real-world drivers of deficiencies and increased nutrient demands:
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Diet patterns like vegetarian/vegan or limiting animal protein
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Some people doing paleo (especially depending on blood type)
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Gut issues like constipation, diarrhea, and acid reflux
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Medications—especially proton pump inhibitors (for acid reflux), which he says can block iron absorption and even list hair loss as a side effect
Toward the end, he emphasizes follow-up and safety: if you supplement aggressively (Vitamin D or iron), he recommends retesting after 90 days or discontinuing, because going too high (like Vitamin D over 100) can create problems.
Bottom line: the episode’s message is to identify and correct nutritional factors through targeted blood work, so you can build what he calls a solid foundation for growth—because, as he says, when the foundation is solid, hair can regrow and maintain.
