Abstract Background/Purpose Dietary habits and nutrients have been associated with
migraine. The present study comprises a meta-analysis of observational studies evaluating
serum levels of 25-hydroxyvitamin D (25 (OH) D) in patients with migraine and healthy
controls. Methods MEDLINE and Cochrane databases were comprehensively searched.
References from retrieved observational studies, reviews and meta-analyses were manually
screened. Quality assessment was performed based on the Newcastle-Ottawa Scale. 25 …