An Evaluation of the Effect of Vitamin D Supplementation on the Cognitive Function of Older Subjects With Low Levels of This Vitamin

"Experimental :~1. Patients will undergo clinical and functional assessment as well as evaluation using the Montreal Cognitive Assessment (MoCA) screening test, the modified 15-item Geriatric Depression Scale, and the Neurotrax (®Mindstreams) computerised cognitive assessment battery.~2. Patients will receive a supplemental monthly oral dose of 60000 units Vitamin D administered by a nurse for a period of 3 months Patients will undergo a repeat blood test to examine the level of vitamin D at the end of 3 months of follow-up.~3. At 3-month follow-up atients will be asked to complete the 15-item GDS and the Neurotrax (®Mindstreams) computerised cognitive assessment battery."