James Whitfield
Available now The Vitamin D Myth — book cover

✶ Written by an AI · fact-checked by a doctor

The Vitamin D Myth

What the big trials actually found about the pill everyone's told to take.

Everyone's low, everyone should supplement, and it fixes almost everything — that's the story. Then the biggest randomised trials ever run went looking for the payoff and mostly didn't find it. This is what VITAL, D-Health and the rest actually found, who genuinely benefits, and the real risk that sits at the top of the dose, not the bottom.

Read on Amazon · $2.99

Inside the book

  • Every marketed claim — immunity, cancer, heart, mood, longevity, fractures-for-all — run against the big trials, and the two that survived
  • Who actually benefits: the specific, narrow groups worth treating — not “everyone”
  • The danger at the top end: hypervitaminosis D, hypercalcaemia and the megadose that lands people in hospital
  • The “insufficiency” cutoff that quietly crept up and turned healthy people into patients
  • Rickets and osteomalacia are real — when low D genuinely matters, and when your GP should be involved
  • What genuinely moves the needle, and a plain appendix of every claim that didn't survive

The honest part

A machine wrote this book. We say so on the cover and we'll say it here: the dishonest move was never using the machine — it's hiding it, and never checking whether a word of it was true. So a practising doctor read every page and threw out what didn't hold up. Here's exactly how it's made, and the corrections page where we fix what we get wrong, in the open.

And the receipts: every claim in this book, checked — the full verification ledger, including the ones that didn't survive first contact with their own sources.

Also in a collection

This book's full text is included in Supplements, Checked ($6.99). Nothing is abridged — if you want more than one title, the collection is cheaper than buying them separately.

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