Vasodilator, increases circulation, improves sebaceous secretions, decreases capillary hyperpermeability, improves tissue irrigation, and activates cell metabolism, particularly in the cortex (by increasing glucose and oxygen uptake). Ginkgolide B is inhibitor of platelet-activating factor, together with the activities of the flavonoids as radical scavengers, can explain the numerous properties of Ginkgo extract. Ginkgo is anti-inflammatory and anti-allergenic.