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KURUMI KAKU

68

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

A natural walnut shell powder from Juglans species used as a gentle abrasive in facial scrubs and cleansing products.

Kurumi Kaku is the ground shell of various Juglans (walnut) species. Walnut shell is used as a natural exfoliant but is a known allergen — juglone and other phenolics in walnut can cause contact dermatitis. The CosIng database notes a Japan-specific INCI naming convention, and in the EU it falls under general natural ingredient provisions without specific restriction, though allergen declarations are required.

Skin benefits

  • Natural biodegradable abrasive for mechanical exfoliation
  • Contains tannins with astringent properties

Known concerns

  • Juglone and phenolic compounds are known contact allergens
  • Must be declared as a nut allergen in finished product
  • Natural variation in allergen content between batches

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.