Arnica, or leopard's bane, is a perennial herb native to North America and Eurasia. It is used to make a tincture which is used topically to treat sore muscles and bruising. Many conventional drug stores carry arnica preparations, and the herb is also available at health food stores and other businesses which carry natural health care products. The herbal remedy is quite effective, especially for bruising, and it is often recommended by mainstream doctors as well as herbalists.

The Arnica genus has a number of member species, all of which can be used to create arnica tinctures. The plants have bright yellow flowers which grow in radial heads, and opposite simple leaves which grow on branching stalks. The whole plant is used in the preparation of arnica tinctures, which are usually sold in the form of a gel which can be easily applied to the skin. One species of arnica, A. montana, was historically used as a tobacco substitute in Northern Eurasia, leading some people to call it mountain tobacco.

A number of chemical compounds have been isolated in arnica. It appears that the herb stimulates the production of white blood cells, which can help to clear brusing. Arnica also promotes fluid drainage and the release of toxins, reducing muscle soreness and pain. If you are taking arnica for muscle soreness, stay well hydrated to help flush the loosened toxins out of your body. The herb may also help with arthritis, joint pain, and acne when used externally.

As a topical anti-inflammatory, arnica appears to be quite useful. Applications of arnica gel often bring swelling the bruising down very quickly, and repeat applications can resolve areas of tenderness quite rapidly. In some cases, arnica may also be blended with other botanical ingredients to hasten healing and promote healthy skin. These preparations should never be consumed internally, as arnica can be quite harmful when ingested, and patients should wash their hands after applying an arnica gel or paste.

Some homeopathic remedies also use arnica. Homeopathy relies on using very small concentrations of herbs and other substances, so these preparations are safe to consume when used as directed. When tested, the tinctures used in homeopathy are often so diluted that chemists cannot detect even trace amounts of the substance used in the tincture. Arnica intended for ingestion will be clearly labeled as a homeopathic tincture; if you are in doubt, don't consume it.