Polygonum Cuspidatum Extract Details Product Name: Polygonum Cuspidatum Extract Herb Source: Polygonum Cupidatum Sieb. et Zucc. Part Used: Root and Stem Active Ingredient:  Resveratrol, Emodin Appearance: Brown Yellow or White Powder Specification: Resveratrol 20%~99% Test Method: HPLC CAS#: 501-36-0 Resveratrol Molecular Formula & Molecular Weight: C14H12O3; 228.24 Resveratrol Structural Formula: What Is Polygonum Cuspidatum Extract ? Polygonum cuspidatum (Japanese knotweed is widely distributed in China. Now Polygonum …