Homeopathy, the medical philosophy that “like cures like,” is big business. According to the latest estimates from the Centers for Disease Control, $2.9 billion were spent in out-of-pocket costs by adults in the United States for homeopathic medicine in 2007. The medical philosophy of homeopathy, developed in Germany over 200 years ago, posits that any substance that produces certain symptoms in a healthy person can also be used to cure those symptoms in a sick person. Homeopathic cures introduce one of these substances to cure a person of their symptoms.