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Resveratrol is extracted from the root and stem of Polygonum cuspidatum Sieb. et Zucc., one perennial herbage plant of Polygonaceae. Polygonum cuspidatum has the richest content of Resveratrol in the plant. Pharmacological researches indicate that Resveratrol has the effects of anti-inflammation, anti-bacteria, antioxidation and anti-cancer, etc..