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Related Experiment Videos

Genetic Causal Association Between Vitamin E and Depression: A Two-Sample Mendelian Randomization Study.

Dehua Zhao1, Xiaoqing Long1, Jisheng Wang1

  • 1Department of Clinical Pharmacy, The Third Hospital of Mianyang (Sichuan Mental Health Center), Mianyang, Sichuan, People's Republic of China.

Brain and Behavior
|May 29, 2026
PubMed
Summary

This study found no causal link between vitamin E and depression risk using Mendelian randomization. Further research is needed to explore potential non-linear associations between vitamin E and depression.

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Area of Science:

  • Nutritional Neuroscience
  • Genetic Epidemiology

Background:

  • Conflicting evidence exists regarding the relationship between vitamin E and depression.
  • Investigating potential causal links is crucial for understanding depression etiology.

Purpose of the Study:

  • To assess the causal effect of vitamin E on depression risk.
  • Utilize a two-sample Mendelian randomization (MR) approach to overcome limitations of previous observational studies.

Main Methods:

  • Employed large-scale genome-wide association studies (GWAS) data for vitamin E and depression.
  • Applied five complementary MR methods including inverse-variance weighted (IVW) and MR-Egger.
  • Conducted sensitivity analyses to ensure the robustness of findings.

Main Results:

  • Nine single-nucleotide polymorphisms (SNPs) served as instrumental variables.
  • All MR analyses showed statistically non-significant odds ratios (P > 0.05).
  • Sensitivity analyses supported the null findings, indicating no robust causal association.

Conclusions:

  • Genetically predicted vitamin E is not causally associated with depression risk.
  • A potential non-linear association between vitamin E and depression warrants further investigation.