POLYGONUM CUSPIDATUM ROOT EXTRACT is graded A (Safe) by Expert·ING, based on COSING, FDA regulatory data.
POLYGONUM CUSPIDATUM ROOT EXTRACT
Japanese Knotweed Root Extract
Safety grade: A
Japanese knotweed is a plant whose root extract is rich in powerful compounds called polyphenols, particularly resveratrol, which help protect skin from environmental damage. This ingredient comes from the underground root of the plant and is concentrated for use in skincare products.
This ingredient works as an antioxidant to neutralize free radicals and environmental stressors that can damage and age skin, helping to maintain skin's youthful appearance and protect it from oxidative stress.
Graded using: COSING, FDA.
Last verified: May 26, 2026
Other Antioxidant ingredients
- TOCOPHEROL — Grade A
- TOCOPHERYL ACETATE — Grade A
- BHT — Grade C**
- ASCORBYL PALMITATE — Grade A
- HYDROXYACETOPHENONE — Grade A
- PENTAERYTHRITYL TETRA-DI-T-BUTYL HYDROXYHYDROCINNAMATE — Grade A
- ASCORBIC ACID — Grade A
- CAMELLIA SINENSIS LEAF EXTRACT — Grade A