Vitamin D, a multipurpose steroid hormone, is vital to health. Vitamin D deficiency is present in approximately 30% to 50% of the
general population. Its deficiency is now considered a worldwide pandemic. A strong correlation exists between vitamin D deficiency
and the pathogenesis of several medical disorders. It is also being increasingly implicated in the pathology of several cognition and
mental illness. Scientific data suggests that raising vitamin D levels to normal may help reduce the elevated morbidity and mortality risk
associated with this deficiency. This study confirms a possible causal association between vitamin D deficiency and schizophrenia.
Keywords: schizophrenia, vitamin D, depression, mental illness