Support For Healthy Aging. Vegetarian Capsules. pTeroPure® Pterostilbene is 99% pure pterostilbene a compound that occurs naturally in small amounts in fruits such as blueberries huckleberries and grape. Pterostilbene is similar in structure to the anti-aging compound resveratrol but is more bioavailable and preliminary research indicates that in some ways it may be even more beneficial. Preliminary research shows 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 inflammation response.