Arnica refers to a clan of flowering perennial plants from the daisy family that's native to Europe and Siberia but also grows in North America, especially in mountainous regions.

It is well-known for its use in natural medicine and is recognizable through its flowers, which have yellow petals and an orange center. Arnica grows between 1 to 2 feet high, with one to three flower blossoms per plant.

Arnica flowers and roots have been used for hundreds of years as an herbal medicine. It was said that the German poet and philosopher Goethe consumed arnica tea to relieve chest pain.

Arnica and its extracts have been widely used in folk and homeopathic medicine as a treatment for acne, boils, bruises, rashes, sprains, pains, and other wounds. Overall, there does not appear to be sufficient evidence to support the use of arnica as an anti-inflammatory or analgesic agent, or to prevent bruising; however, heterogeneity of doses and delivery forms (as well as indications) in available clinical studies makes generalizations difficult.