Everyone talks about vitamin D. Almost nobody interprets it correctly. In this episode, Vitality Blueprint Chief Innovation Officer Dan Garner takes apart the most misread marker in performance blood work and shows why the number on the page rarely means what people think it means. A vitamin D of 32 comes back normal in the medical world, sufficient to the Endocrine Society, and still short in performance, and all three reads are right. The difference is the question you ask of the number. Dan explains why vitamin D behaves like a hormone, not a vitamin, and why that one fact changes how you read every result.
From there he delivers the playbook: the four mechanisms that make vitamin D read falsely low (inflammation, low binding proteins, higher body fat, and poor absorption), the four that make it read falsely high (a recent big dose, estrogen, C3 epimers, and dehydration), and why a single inflamed draw can understate the marker by 40%. He breaks down the 500,000 IU study where more backfired and fractures went up, why supplementing people who are already sufficient does almost nothing, the magnesium and K2 cofactors that make vitamin D usable, and the target worth hitting (40 to 80). Then he lays out how to test season to season so you act preventively instead of reactively. Don't just read the number. Know whether to believe it.