Vitamin D and Vitamin B<sub>12</sub> in Psychiatric Disorders: An Exploratory Systematic Review and Meta-Analysis of Nutrient-Specific Status and Supplementation Evidence.

Egger’s test did not reach statistical significance for vitamin B 12 status (intercept = −4.71, 95% CI −9.46 to 0.04; p = 0.088), but this does not resolve the interpretive problem created by extreme heterogeneity and the very wide prediction interval.

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