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Vitamin E Supplementation and Mortality in Healthy People: A Meta-Analysis of Randomised Controlled Trials

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Abstract

Purpose

To evaluate the effect of oral vitamin E supplementation on all-cause mortality in apparently healthy people.

Methods

A systematic review and meta-analysis was conducted on randomised controlled trials (RCTs) with ≥6 months of follow up investigating the effect of vitamin E supplementation on healthy adults in developed countries. Electronic databases (MEDLINE, EMBASE, and Cochrane Central Register of Controlled Trials) and reference lists of trial reports were searched for RCTs published between 1966 and June 2012. Three investigators assessed eligibility of identified trials. Disagreements were resolved by consensus. Two investigators independently extracted data according to the criteria.

Results

There were 18 RCTs identified with 142,219 apparently healthy participants (71,116 in vitamin E intervention groups and 71,103 in control groups) that were included in the final analysis. Fixed effect and random effects analysis of the 18 trials revealed that supplementation with vitamin E was not associated with all-cause mortality (relative risk 1.01, 95 % confidence interval 0.97 – 1.05, p = 0.65). Subgroup analyses by type of vitamin E (natural or synthetic), dose or duration of exposure, study design or quality, and pre-specified mortality outcome showed no association with all-cause mortality.

Conclusions

The evidence from pooled analysis of 18 randomised controlled trials undertaken in apparently healthy people shows no effect of vitamin E supplementation at a dose of 23–800 IU/day on all-cause mortality.

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Acknowledgments

We thank Lorena Romero, Senior Librarian, Ian Potter Library at Alfred Health for her assistance with the search strategy, also Dr Lisa Demos and Dr Kathlyn Ronaldson (School of Public Health and Preventive Medicine, Monash University) for their constructive comments on the manuscript. We would like to acknowledge the contribution made by the late Associate Professor Damien Jolley to the discussion and planning for this study.

Conflict of Interest

AC, MB and LP declare that they have no conflict of interest. JM has received honoraria for service on advisory boards for Pfizer, Bayer and Janssen-Cilag.

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Correspondence to Andrea J. Curtis.

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Curtis, A.J., Bullen, M., Piccenna, L. et al. Vitamin E Supplementation and Mortality in Healthy People: A Meta-Analysis of Randomised Controlled Trials. Cardiovasc Drugs Ther 28, 563–573 (2014). https://doi.org/10.1007/s10557-014-6560-7

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