The worthlessness of Vitamin D is mildly exaggerated

# Summary While vitamin D was once believed to have near-magical health benefits, scientific consensus shifted to the view that supplements are useless except for severely deficient individuals. However, the author argues this skepticism has overcorrected—randomized trials show weak but positive evidence for supplementation, and biological understanding suggests people with low-to-moderate vitamin D levels would likely benefit from supplementing, despite the lack of definitive proof.