 When completing difficult tasks, the brain requires faster delivery of energy sources oxygen and glucose via the blood. There is evidence to suggest that some nutritional supplements may increase blood circulation in the brain which can result in improved task performance. The purpose of the study is to evaluate the effects of a multivitaminmineral preparation containing a range of vitamins and minerals as contained in commonly consumed multivitaminminerals available off the shelf in healthy females on cerebral brain blood flow and energy expenditure during cognitive task performance. 