Polygonum Cuspidatum Extract
INCI: POLYGONUM CUSPIDATUM EXTRACT
Reviewed by Emma · Last updated 14 Aug 2026
A plant extract traditionally used in Asian medicine with emerging antioxidant properties
Best For Skin Types
All, Oily, Combination
Addresses
Usage Frequency
Daily
What Is Polygonum Cuspidatum Extract?
Polygonum cuspidatum extract is derived from Japanese knotweed, a plant with a long history of use in traditional Chinese and Japanese medicine. The extract contains bioactive compounds, notably polydatin, which function as antioxidants in skincare formulations.
In cosmetic products, it serves as a skin conditioning agent, working to support the skin's natural functions rather than providing dramatic transformations.
How It Works
The extract appears to work primarily through its antioxidant compounds, which can neutralise harmful free radicals and reduce reactive oxygen species (ROS) in skin cells. This may help protect against oxidative stress, a key factor in premature skin ageing.
In vitro research suggests the extract may also improve cellular energy production efficiency, which could indirectly support the skin's natural repair and maintenance processes. However, most mechanistic understanding comes from laboratory studies rather than human skin research.
Clinical Evidence & References
In vitro studies show that Polygonum cuspidatum extract can reduce ROS levels in senescent cells and restore some age-related cellular characteristics. A small human trial found that a cleanser containing this extract (alongside other ingredients) reduced skin oil content and pore size over time, though isolating the ingredient's individual contribution is difficult.
Animal studies suggest potential wound healing benefits, but human clinical data is limited. The evidence base is modest, and most studies involve the extract in combination with other botanicals rather than in isolation. More rigorous human research would help clarify its skincare effects.
Published Research
How to Use
Polygonum cuspidatum extract is typically found in serums, cleansers and moisturisers. There are no established restrictions on frequency, and it can generally be used daily as part of your routine. It works well alongside other antioxidants and skin conditioning ingredients, though no special pairing protocols are required.
Safety & Precautions
Frequently Asked Questions
From the Clinic
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