A Randomized, Double-Blind, Placebo-Controlled, Phase II Study to Evaluate the Safety, Tolerability, and Efficacy of Intranasal Insulin and Glutathione as an Add-On Therapy in Subjects With Parkinson's Disease (NOSE-PD)

Key Inclusion Criteria: * Documented clinical diagnosis of idiopathic PD * Able to administer study drug or have a caregiver throughout the duration of the study to help administer drug * Willing to continue diet, exercise and medications reported at baseline consistently throughout participation in the trial. Essential changes are permitted * If taking PD medications or any nutraceuticals, must be on a stable dose for at least 30 days prior to Screening Visit. Essential changes will be permitted. * If subject is taking chronic antidepressant or an anxiolytic, must be on a stable dose for at…