Effect of Synbiotic as an Adjuvant Therapy in the Treatment of Parkinson's Disease

This study is testing whether taking a synbiotic (a combination of probiotics and prebiotics — beneficial bacteria and the foods that feed them) can improve symptoms and quality of life in people with Parkinson's disease who are already on dopamine replacement medication. **You may be eligible if...** - You are between 45 and 65 years old - You have been diagnosed with Parkinson's disease - You are currently taking dopamine replacement therapy - Your Parkinson's is at a Modified Hoehn and Yahr stage of 1 to 4 **You may NOT be eligible if...** - You have recently taken antibiotics or probiotic products - You have had or are scheduled for gastrointestinal surgery - You have an allergy to probiotics - You have depression, psychosis, hyperthyroidism, or inflammatory conditions - You are a smoker - You take antioxidant or anti-inflammatory medications Talk to your doctor to see if this trial is right for you.