Licorice is a plant that is used to treat stomach and mouth ulcers as well as conditions like Addison's disease and arthritis. It is commonly used to flavor tobacco in the United States. The roots of the licorice plant are used to make licorice products. Licorice mostly comes from West Asia and is manufactured in countries like China and Pakistan. Licorice products come in forms like teas, tablets, capsules, and liquid extracts. High doses of licorice can cause side effects like muscle weakness and issues with blood pressure and potassium levels.