Homeopathy is a system of alternative medicine that originated in the late 18th century. It is based on the principle that "like cures like," meaning that a substance that causes symptoms in a healthy person can cure similar symptoms in a sick person when given in very low doses. Homeopathic remedies are prepared from plant, mineral, animal, diseased tissue, and other sources, and are believed to stimulate the body's natural healing abilities. Common homeopathic remedies include arnica, belladonna, and chamomilla. Homeopathy is considered a gentle, non-toxic approach to treatment.