Medicinal parts include the flowers and the root stock. Arnica is a perennial plant that is generally found in mountainous areas of Canada, the northern US, and Europe. The flowers appear from June to August. Arnica has been used as a diaphoretic, diuretic, emollient, expectorant, stimulant, and vulnerary.
Arnica is primarily for external usage.
As a tincture or salve, it helps to promote the healing of wounds, bruises, and general irritation. However, only very dilute solutions of tincture should be used, since the tincture can cause blistering and inflammation when applied. Arnica is also sometimes used as a poultice, and a tea made from the flowers for a compress on the stomach to relieve abdominal pains. The dilute tincture can be helpful in inflammation of the mouth and throat, and some doctors use it for internal bleeding and as a cardiac agent.