What deficiency can cause paranoia?
                                
                                
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                                    5 min read                                
                            
                                Case reports have documented that paranoid psychoses can be caused by vitamin B12 deficiency, a condition that can affect the central nervous system even without anemia. Research shows that other nutritional inadequacies, such as low levels of zinc and vitamin D, may also contribute to or exacerbate paranoia and other psychiatric symptoms.