Disclosed is a method of improving the cognitive function of a cognitively healthy human adult, the method comprising administering to the human adult an effective amount of a composition comprising lutein, zeaxanthin and meso-zeaxanthin and at least one omega-3 fatty acid, over a period of at least 24 months, the improved cognitive function being a detectable improvement in: spatial working memory as measured by the CANTAB Connect Research software SWM task； and/or reduced reaction time as measured by the CANTAB Connect Research Software RTI task.
