Polygonum cuspidatum root extract
AKA “Japanese Knotweed
Extract
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Ingredient Facts
Polygonum cuspidatum root extract
AKA: Japanese Knotweed
Extract · Antioxidant | Skin Conditioning | Soothing · EWG: 4
Plant-Derived
Antioxidant
Soothing
Skin Conditioner
Extract
Clean
Japanese Knotweed root extract is a natural antioxidant that helps protect skin from environmental damage and supports a healthy, radiant complexion.
Family
Polygonaceae (Buckwheat family)
Plant Part
Root
Lifeform
Perennial
Climate
Seasonally dry tropical
CAS #
-
Form
Liquid
Plant-Derived
Botanical. Native to East Asia, Japan, China. Derived from the roots of Polygonum cuspidatum, a plant native to East Asia belonging to the Polygonaceae family. Extracted from dried roots through solvent extraction methods to obtain concentrated bioactive compounds.
Plant Source
Polygonaceae (Buckwheat family)
Plant Part
Root
Function
Antioxidant | Skin Conditioning | Soothing
Benefits
Antioxidant Protection
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
Target
Antioxidant
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
EWG Score4
CIR Safety Findings
all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: Kew POWO · CosIng · EWG · CIR