| Summary: | Depression is a state of sadness, hopelessness, and discouragement. Various studies have been conducted to uncover the etiological factors involved in depression. Serum folic acid is one such factor. Many researchers have reported an inverse association between serum folic acid and depression. We did an extensive computerized database searches on PubMed, Medline, and EBSCO and found that low serum folic acid are associated with depression, not only in adults, but also in elderly and diabetic patients. Further augmentation of folic acid with antidepressant treatment also improves the treatment outcome in depressed patients. Hence, considering the high benefits to the adverse effects ratio of serum folic acid, its supplementation should be done in "at risk" population whenever possible.
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