Castanea Sativa (sweet chestnut) seed extract is a plant-derived ingredient rich in polyphenols and tannins, valued for its antioxidant and skin-soothing properties. It is used in cosmetic formulations to help protect skin from oxidative stress and as a conditioning agent.
| Reported effect | How often | Notes |
|---|---|---|
Contact irritation | Rare | Mild redness or stinging possible, more likely with sensitive skin or high tannin content. |
Allergic contact dermatitis | Rare | Sensitization to botanical or tannin components has been occasionally reported. |
Cross-reactivity in tree nut-sensitive individuals | Very rare | Theoretical concern; topical reactions are uncommon as proteins are typically removed. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.