OPN1MW and Parkinson disease: Small, uncontrolled pilot studies in patients with Parkinson’s have demonstrated improvements in dystonia over 6 weeks with oral CBD capsules (100–600 mg/day) [94] and in psychosis symptoms (Brief Psychiatric Rating Scale and the Parkinson Psychosis Questionnaire) over 4 weeks with oral CBD (n = 6, starting at 150 mg/day [95]).