Evidence CBD does not help schizophrenia
However, research also suggests that CBD may not have any benefits for schizophrenia. For example, in a 2018 study, researchers gave either 600 milligrams per day of CBD or a placebo to a group of 36 people with schizophrenia for 6 weeks.
The placebo group showed more improvement than the CBD group, and those who took CBD developed more symptoms of sedation.