... Resveratrol [Out appearance]: Light yellow to white fine powder [Active ingredients]: emodin, chrysophanol, physcion-8-β-D-glucoside, resveratrol, ... polydatin, quercetin, polysaccharide, etc.[Effective ingredients]: Resveratrol[Extract method]: Alcohol and water[Test method]: ... Giant knotweed extract is one of the best active-oxygen scavengers for the prevention of skin ...