Arnica montana extract is a plant-derived ingredient used topically in skincare for its traditional anti-inflammatory and circulatory-supporting properties, often included in products marketed for bruising, soreness, and skin soothing. Its active constituents include sesquiterpene lactones such as helenalin.
| Reported effect | How often | Notes |
|---|---|---|
Allergic contact dermatitis | Uncommon | Sensitization is well documented, particularly in individuals allergic to other Asteraceae/Compositae plants; helenalin is a recognized allergen. |
Skin irritation, redness, or itching | Uncommon | Mild local irritation can occur, especially with higher concentrations or on broken skin. |
Eczematous or vesicular reactions | Rare | Reported with prolonged or repeated application in sensitized individuals. |
Systemic or severe allergic reaction | Very rare | Rarely reported; risk increases with application to damaged skin or mucous membranes. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.