... at three critical stages Giant Knotweed Extract ResveratrolTraditional Andmodernuses:Huzhang ("tiger cane") or giant knotweed is an east Asian ... indicate that other concentrated sources of resveratrol (i.e., red wine and grape juice) eliminate cyclic ... their glycosides, napthoquinone, 3,5,4¡Â-trihydroxy stilbene (i.e., resveratrol), piceid, fallacinol, citreorosein, questin, questinol, protocatechuic ...