... Specification:20%, 50%, 98%, 99% Resveratrol Latin Name:Polygonum Cuspidatum Appearance:Brown to White Powder Plant Part Used:Root ... class of polyphenolic compounds called stilbenes, nature exist in grapes, Polygonum cuspidatum, peanuts, Mulberry, Gnetum plants, etc., and mainly ... existence as trans-structure. Using 5 years Polygonum cuspidatum as raw material and taking high-tech extraction ...