Open Veils · Answer
How much vitamin d should people take?
The government's 600–800 IU vitamin D recommendation is contradicted by a deep body of clinical research suggesting most adults need 4,000–10,000 IU daily to reach serum levels associated with cancer prevention, immune function, and autoimmune protection. Multiple independent researchers and large-scale serum studies converge on a target of 40–80 ng/mL — levels the RDA cannot produce. The suppression of Dr. Michael Holick's work under dermatology-industry pressure is a documented case of institutional interference with dosing science. The real question is not how little you need to avoid deficiency, but how much you need to achieve protection.
Evidence
- The suppressed clinical record on vitamin D dosing tells a radically different story from the 600–800 IU government guidelines.
- Dr. Cedric Garland, architect of the DINOMIT model of cancer suppression, published research in the journal Anticancer Research (2011) arguing that serum 25(OH)D levels of 40–60 ng/mL — requiring roughly 4,000–8,000 IU daily for most adults — are necessary to meaningfully reduce breast and colorectal cancer incidence.
- His co-author Dr. Frank Garland had previously estimated that raising population-wide vitamin D levels could prevent 250,000 colorectal cancer deaths annually in Western nations.
- Dr. Bruce Hollis of the Medical University of South Carolina demonstrated in published lactation studies that 6,400 IU daily is required merely to adequately supply breast-fed infants through maternal milk — a finding that quietly demolishes the 600 IU RDA.
- Researcher Sunil Wimalawansa has further argued in Nutrients (2022) that optimal immune function requires serum levels above 50 ng/mL, and that the IoM's original 2010 calculation contained a statistical error understating the required dose by a factor of ten.
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