Vitamin D's reputation collapsed when randomized trials couldn't prove it delivered on promises of stronger bones and better health. But according to LessWrong, scientists may have been too quick to dismiss it. While the famous health correlations aren't proof of causation, the author argues that weaker but consistent trial evidence, combined with how vitamin D actually works in your body, suggests people with low levels should still supplement. It's not certain—but it's the best bet we have.

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