Latin name: Polygonum cuspidatum sieb.et Zuec Part used: Rhizome Appearance: Orange or redish brown powder Test Method:HPLC Part of the Plant Used: Root & Rhizome of Polygonum cuspidatum Sieb. et Zucc. Extract Method:Alcohol Applicable field:Medicine Assay:10%--99% Active material: Resveratrol Molecular Formula :C14H12O3 Molecular Weight:228.24 Melting point: 253oC-255oC Solubility: soluble in diethyl ether, Chloroform, Etheyl alcohol, Acetone Packing: Double-deck plastic bag, pack with aluminium foil paper outside Shelf Life : 2 years under well Storage situation and stored away from direct sun light. What is the Giant Knotweed Extract? Giant knotweed is an east Asian species (Polygonum cuspidatum), belonging to the Polygonaceae family. Documented uses in traditional Chinese medicine date to the first century BC, and contemporary medical uses supported by clinical results include acute microbial infections or viral hepatitis, chemo- or radiation-induced leukocytopenia, atherosclerosis, and hyperlipidemia.