Where does resveratrol exist? Resveratrol is found in plants such as Polygonum cuspidatum, grape, peanut skin, giant knotweed and strawberry. The extremely small amount is a polyphenolic compound. (Slightly different from ordinary polyphenol structure)。Polygonum cuspidatum contains more resveratrol plants than grapes, it is a kind of herbaceous plants of Polygonaceae. The Chinese used it as a prescription for diuretic and constipation a long time ago. Extracting Resveratrol from the roots of Polygonum cuspidatum is easier than taking it from grapes. It has been taken into capsules in Europe and the United States.