Giant Knotweed Extract Resveratrol Product Specification:20%, 50%, 98%, 99% Resveratrol Latin Name:Polygonum Cuspidatum Appearance:Brown to White Powder Plant Part Used:Root & Rhizome Extract Solution:Ethanol CAS#:501-36-0 What is Resveratrol ? Resveratrol belongs to a class of polyphenolic compounds called stilbenes, nature exist in grapes, Polygonum cuspidatum, peanuts, Mulberry, Gnetum plants, ...