Japanese Knotweed Supreme (Polygonum cuspidatum) 375mg - 120 Capsules | Supreme NutritionJapanese Knotweed Supreme is a food supplement containing Polygonum cuspidatum, a botanical rich in polyphenolic compounds. The plant is naturally associated with resveratrol together with related stilbenes and other phenolic constituents characteristic of the species. This capsule format presents the botanical as a focused single ingredient preparation. This formulation is produced without unnecessary additives and is intended for use as part of a