Castanea Crenata (Japanese chestnut) shell extract is a botanical ingredient rich in polyphenols and tannins, used in skincare for its antioxidant and skin-conditioning properties. It is studied for potential brightening, anti-inflammatory, and free-radical scavenging effects.
| Reported effect | How often | Notes |
|---|---|---|
Contact irritation (mild redness or stinging) | Rare | Possible in sensitive skin, generally associated with higher concentrations of tannin-rich botanical extracts. |
Allergic contact dermatitis | Very rare | Plant-derived polyphenols and tannins can occasionally act as sensitizers in predisposed individuals. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.