Detailed Product Description Giant knotweed P.E [Product name]: Giant Knotweed P.E[Part Used]: Root [Latin name]: Polygonum cuspidatum Sieb.et Zucc P.E[Specification]: 20%, 50%, 98% and 99%Resveratrol [Out appearance]: Light yellow to white fine powder [Active ingredients]: emodin, chrysophanol, physcion-8-β-D-glucoside, resveratrol, polydatin, quercetin, polysaccharide, etc.[Effective ...