Schizophrenia can cause delusions, hallucinations, confused thinking and dramatic changes in behaviour. High doses of B vitamins can help reduce the symptoms of schizophrenia, new research finds. B vitamins, including B6, B8 and B12 were added to the normal treatment of people with schizophrenia. Schizophrenia is one of the most serious types of mental illness. It can cause delusions, hallucinations, confused thinking and dramatic changes in behaviour. Dr Joseph Firth, the study’s lead author, said: