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Pterostilbene is a natural analog of resveratrol found in blueberries that has been shown to protect cells against oxidative stress both in vitro and in vivo. This is significant because current research points towards the accumulation of damage resulting from oxidative stress as a cause of cognitive decline. Free radicals from both the environment and normal cellular respiration can steal electrons from cell walls, causing permanent damage that can be passed on to subsequent generations of cells. Studies show that pterostilbene supplementation is significantly correlated to increased cognitive function in rats, likely due to pterostilbene’s ability to reduce damage caused by oxidative stress.