There were no overall effects from antioxidant vitamins , inositol or dietary minerals on psychiatric symptoms .
There is preliminary evidence that certain vitamin and mineral supplements may reduce psychiatric symptoms in some people with schizophrenia .
BACKGROUND When used as an adjunctive with antipsychotics , certain vitamins and minerals may be effective for improving symptomatic outcomes of schizophrenia , by restoring nutritional deficits , reducing oxidative stress , or modulating neurological pathways .
Randomized multicenter investigation of folate plus vitamin B12 supplementation in schizophrenia.
IMPORTANCE More effective treatments are needed for negative symptoms of schizophrenia , which are typically chronic , disabling , and costly . Negative symptoms have previously been associated with reduced blood folate levels , especially among patients with low-functioning variants in genes that regulate folate metabolism , suggesting the potential utility of folate supplementation . OBJECTIVES To determine whether folic acid plus vitamin B12 supplementation reduces negative symptoms of schizophrenia and whether functional variants in folate-related genes influence treatment response . DESIGN Parallel-group , r and omized , double-blind , placebo-controlled clinical trial of 16 weeks of treatment with 2 mg of folic acid and 400 μg of vitamin B12 . SETTING Three community mental health centers affiliated with academic medical centers in the United States . PARTICIPANTS Out patients with chronic schizophrenia who were psychiatrically stable but displayed persistent symptoms despite antipsychotic treatment . Eligible patients were 18 to 68 years old , were treated with an antipsychotic agent for 6 months or more at a stable dose for 6 weeks or more , and scored 60 or more on the Positive and Negative Syndrome Scale . INTERVENTION One hundred forty subjects were r and omized to receive daily oral folic acid plus vitamin B12 or placebo . MAIN OUTCOME MEASURES Change in negative symptoms ( Scale for the Assessment of Negative Symptoms [ SANS ] ) , as well as positive and total symptoms ( Positive and Negative Syndrome Scale ) . RESULTS Folate plus vitamin B12  improved negative symptoms significantly compared with placebo ( group difference , -0.33 change in SANS score per week ; 95 % CI , -0.62 to -0.05 ) when genotype was taken into account but not when genotype was excluded . An interaction of the 484C > T variant of FOLH1 ( rs202676 ) with treatment was observed ( P = .02 ) , where only patients homozygous for the 484 T allele demonstrated significantly greater benefit with active treatment ( -0.59 change in SANS score per week ; 95 % CI , -0.99 to -0.18 ) . In parallel , we observed an inverse relationship between red blood cell folate concentration at baseline and 484C allele load ( P = .03 ) , which persisted until 8 weeks of treatment . Change in positive and total symptoms did not differ between treatment groups . CONCLUSIONS Folate plus vitamin B12 supplementation can improve negative symptoms of schizophrenia , but treatment response is influenced by genetic variation in folate absorption . These findings support a personalized medicine approach for the treatment of negative symptoms . TRIAL REGISTRATION clinical trials.gov Identifier : NCT00611806
There were no overall effects from antioxidant vitamins , inositol or dietary minerals on psychiatric symptoms .
There is preliminary evidence that certain vitamin and mineral supplements may reduce psychiatric symptoms in some people with schizophrenia .
BACKGROUND When used as an adjunctive with antipsychotics , certain vitamins and minerals may be effective for improving symptomatic outcomes of schizophrenia , by restoring nutritional deficits , reducing oxidative stress , or modulating neurological pathways .