Nutritional Intervention With the Dietary Supplement, Immunocal® in MCI Patients: Promotion of Brain Health

This study is recruiting Mild Cognitive Impaired (MCI) patients from the Memory Clinic of the Jewish General Hospital only. Inclusion Criteria: Subjects meeting diagnostic criteria for MCI: * Age 55-85 * Male or female * Non-smoker To ensure that the subject can physically fit in the scanner: 1. body weight ≤ 120 kg and 2. with a linear dimension max 55cm (shoulders or belly) Expected to remain in the greater Montreal area for the duration of study. Exclusion Criteria: * Presence of an active, systemic illness (e.g., cancer, rheumatoid arthritis, etc.) or other chronic neurological (e.g. Parkinson's disease, multiple sclerosis) or psychiatric (e.g. major depression, schizophrenia) disease. * Subjects taking other experimental medications or psychotropic agents. * Subjects with MRI contraindications such as pacemaker, aneurysm clips, artificial heart valves, metal fragments, foreign objects or claustrophobia. * Ambulatory subjects: As wheelchair-bound subjects present additional difficulties for transportation and MRI scanning. Musculoskeletal abnormalities that preclude the ability of the subject to lie on his/her back for 1hr during MRI scanning. * Subjects who have a protein restricted diet as per their medical history. * Pregnancy * Subjects using N-acetylcysteine, α-lipoic acid supplements, other whey protein supplements or Vitamin C, within 2 months of enrolment and during the entire 6 months study period. * Allergies to milk proteins/ Milk protein intolerance