Effect of vitamin D supplementation on all-cause mortality: a meta-analysis of randomized controlled trials
Zhang Y, Fang F, Tang J, Jia L, Feng Y, Xu P
Published in BMJ
Methodology
Meta-analysis of 52 randomized trials with over 75,000 participants assessing vitamin D supplementation and mortality outcomes.
Key Findings
Vitamin D supplementation did not reduce all-cause mortality overall, though vitamin D3 was associated with reduced cancer mortality.
Conclusions
Vitamin D does not extend lifespan in the general population; a possible cancer-mortality signal needs confirmation.
Limitations
Trial doses, baseline status and durations varied; subgroup findings exploratory.
Supplements Studied
Vitamin D supplementation did not reduce all-cause mortality overall
Outcomes Measured
Vitamin D supplementation did not reduce all-cause mortality overall, though vitamin D3 was associated with reduced cancer mortality
Related Health Concerns
Study Details
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This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.