Polygonum cuspidatum root extract
AKA “Japanese Knotweed”
Extract
Ingredient Facts
Polygonum cuspidatum root extract
AKA: Japanese Knotweed
Extract · Antioxidant · EWG: 4
Plant-Derived
Antioxidant
Extract
Not Clean
Polygonum Cuspidatum Root Extract is an extract of the roots of the Japanese Knotweed, Polygonum cuspidatum, Polygonaceae
Family
Polygonaceae (Buckwheat family)
Plant Part
Root
Lifeform
Perennial
Climate
Seasonally dry tropical
CAS #
-
Form
Liquid
See origin →
Functions
Antioxidant
Fights free radicals — the unstable molecules from UV, pollution, and stress that break down collagen and cause premature aging.
Neutralizes Free Radicals
Traditional Use
Used in Traditional Chinese Medicine as Hu Zhang for clearing heat and promoting skin health. Japanese knotweed root has been traditionally valued for its antioxidant properties and skin purification benefits.
Skin Types
●all-skin-types
Best For
Antioxidant
Pregnancy & Breastfeeding Safe
Yes
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Verified Jun 2026
Data: Kew POWO · CosIng · EWG · CIR