Study of Vitamin B12 in Patients with Parkinson’s
disease and their caregivers
The purpose of this study is to find out how commonly Vitamin B12 deficiency occurs
in persons with Parkinson’s disease (PD) compared to persons of similar age without
Parkinson’s disease. This study will also examine the effects of supplementing
patients who have Parkinson’s disease with Vitamin B12.
The study involves:
Minimum of one screening visit in the Research Center (GCRC)
Maximum of three visits (2 days and on night each) in the GCRC. The three visits
would occur over a 6-month period.
Patients who have low Vitamin B12 will receive either placebo (sugar pill) or vitamin
Patients diagnosed with Vitamin B12 deficiency, will receive Vitamin B12 for 6 months
(until they finish the study), then will be referred to their primary MD for continued
Visits will include physical examinations that will focus particularly on memory and
neurological examinations, and an evaluation of Parkinson’s disease symptoms. Blood
sampling for laboratory tests to check thyroid, testosterone, vitamin B12, and
questionnaires will also be administered. All study-related examinations, supplements
and tests are provided at no charge.
Key Inclusion Criteria:
Men or women of any age with a clinical diagnosis of idiopathic Parkinson’s disease.
Normal thyroid function
Normal testosterone level (Males)
Key exclusion Criteria:
History of B12 deficiency
Untreated testosterone and thyroid abnormalities
Taking Vitamin B12 supplements (may take a multivitamin supplement and still
Marian L. Evatt, MD
For More Information, Please Contact: Kate Rahimzadeh, BSN; ( below)