Science
Mechanism of Action
This extract functions as a robust antioxidant, adept at neutralizing free radicals and mitigating oxidative stress. It significantly reduces inflammation, thereby calming redness and irritation. Key active components, particularly resveratrol, suppress tyrosinase activity and decrease melanin production, leading to skin brightening. Furthermore, it supports collagen organization and production, inhibits advanced glycation end-products (AGEs), and demonstrates anti-collagenase, anti-hyaluronidase, and anti-elastase activities to enhance skin firmness and elasticity, contributing to anti-aging effects. Resveratrol also imparts antibacterial properties, aiding in acne management and breakout prevention.
Research
Clinical Evidence
Medium confidence0.5%
Key findings
- 01 Inhibition of tyrosinase activity was observed in melanoma cells with a 2.5% extract concentration.
- 02 Melanin production in melanoma cells was lowered by an extract concentration of 5%.
- 03 Tyrosinase inhibition with cellular activity maintained above 85% was noted at 0.003% extract concentration.
- 04 Strong anti-collagenase activity, moderate anti-hyaluronidase, and weak anti-elastase/anti-tyrosinase activities were demonstrated at 0.001% concentration of an ethanolic extract.
Transparency
Dusting Analysis
While specific *in vitro* enzymatic activities (e.g., anti-collagenase, tyrosinase inhibition) have been observed at very low concentrations, sometimes as low as 0.001% to 0.003%, achieving the broad spectrum of anti-aging, brightening, and anti-inflammatory benefits in a cosmetic formulation typically requires concentrations closer to the recommended optimal range of 0.5% to 1%. Therefore, concentrations significantly below 0.1% may not provide comprehensive efficacy.
The Formula
Formulation
Stability
Resveratrol, a primary active component, is susceptible to UV degradation and exhibits poor aqueous solubility, often precipitating in water-based formulations. To enhance its stability, dermal penetration, and prevent recrystallization, formulation with UV-filters and polyols is advised. For optimal incorporation, resveratrol should first be solubilized in ethanol or dispersed in glycerin, butylene glycol, propylene glycol, or dimethyl isosorbide before integration into the cool-down phase of a product.
Synergies
- UV-filters (for resveratrol stability)
- Polyols (for resveratrol stability and solubility)
Safety
Safety Profile
Polygonum Cuspidatum Root Extract is currently on the 2024 Draft Priorities List for review by the Cosmetic Ingredient Review (CIR) Expert Panel. It generally possesses a favorable safety profile, though a patch test is recommended for individuals with highly sensitive skin or known allergies, as mild reactions such as rashes or itching may occur. The Environmental Working Group (EWG) rates this ingredient as 'LOW' concern across categories including cancer, allergies & immunotoxicity, and developmental/reproductive toxicity.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polygonum Cuspidatum Root Extract is a valuable, multi-functional ingredient offering significant antioxidant, brightening, and anti-aging benefits, making it suitable for a wide range of precision skincare applications.
Related
Similar Ingredients
Finding similar ingredients…