Vitamin D's Impact on Cancer Incidence and Mortality: A Systematic Review.

Nutrients · 2025 · PMC12298439 · PMID 40732958

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did not reach statistical significanceno p-value reported

Using Cox proportional hazard regression [HR = 0.7 (95% CI: 0.47–1.02)], the effectiveness of calcium plus vitamin D, compared with a placebo, was suggestive but did not reach statistical significance for reducing cancer risk.

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