pTeroPure® Pterostilbene is 99% pure pterostilbene, a compound that occurs naturally 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 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. *