Cryptomeria Japonica Leaf Extract is a plant-derived ingredient obtained from the Japanese cedar, used in skincare for its antioxidant, anti-inflammatory, and skin-conditioning properties attributed to its polyphenol and essential oil content. It is included in formulations to help protect skin from oxidative stress and soothe the skin.
| Reported effect | How often | Notes |
|---|---|---|
| Contact allergic reaction / sensitization | Rare | Botanical and cedar-derived extracts can occasionally trigger allergic contact dermatitis in sensitized individuals. |
| Skin irritation (redness, itching) | Rare | Possible in sensitive skin, partly due to volatile essential oil components. |
| Respiratory or cross-reactivity in cedar-pollen allergic individuals | Very rare | Theoretical concern given Japanese cedar pollen is a known allergen; topical leaf extract reactions are not well documented. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.