Vegetarian Capsules Dietary Supplement Support For Healthy Aging pTeroPure Pterostilbene is 99% pure pterostilbene, a compound that occurs in small amounts in fruits such as blueberries, huckleberries and grapes. Pterostilbene is similar in structure to the anti-aging compound resveratrol, but is more bioavailable and preliminary research show that pterostilbene may help with healthy cognitive function and may support glucose levels already in a normal range. Emerging science indicates that it may also help support healthy blood lipid levels and a healthy response.