Clinical Research Directory

Inclusion Criteria: * Men and women age ≥60 years * Diagnosis of PD based on United Kingdom PD brain bank criteria, Hoehn and Yahr stage 1-3. * Stable dose of PD medications for 30 days prior to study and for duration of study * If used, stable dose of melatonin, sedative/hypnotic or stimulant medications Exclusion Criteria: * use of other prebiotic or probiotic treatment for 30 days prior to or during the study * unstable medical or psychiatric disorder * history of diabetes mellitus or current use of medication for diabetes * cognitive impairment based on Montreal Cognitive Assessment (MoCA) \<25. * current or recent (within previous 3 weeks) use of laxatives * use of antibiotics in the past 30 days * participation in another clinical trial in the past 30 days.