Bryan Johnson· Author
Some observational studies suggest that higher vitamin D levels are associated with reduced risks of certain cancers, such as colorectal cancer, but not others like breast or lung cancer [8].
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Some observational studies suggest that higher vitamin D levels are associated with reduced risks of certain cancers, such as colorectal cancer, but not others like breast or lung cancer [8].
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Additionally, randomized controlled trials have generally not found vitamin D supplements to reduce overall risk of developing cancer significantly [8].