Dried flower. Roots and leaves are also popularly used.
The European Medicine Agency (EMA) approves topical application for relief from bruises, sprains and muscle aches.
According to the ESCOP, arnica flower is indicated for the topical treatment of bruises, sprains and inflammation.
Harpagophytum has anti-inflammatory, analgesic, anti-platelet, anti-histamine and anti-bacterial effects. Helenalin is the component that gives it these properties.