Jarrow Formulas Pterostilbene features Silbinol (from Pterocarpus marsupium) a natural plant source of Pterostilbene. Pterostilbene is an antioxidant in blueberries and is a methylated form of resveratrol that exhibits better bioavailability than resveratrol. Pterostilbene benefits include its ability to activate sirtuin enzymes, which help to support healthy aging by regulating gene expression, mitochondrial function, and energy metabolism.