Naturopathic Doctors use holistic, comprehensive treatment programs to diagnose and treat individuals and restore or maintain optimal health. Treatment may combine nutrition, botanical medicine, physical medicine, homeopathic treatments and lifestyle changes. They may work in private practices, hospitals, clinics or community health centers. Naturopathic physicians, as they are also known, are licensed in Canada and 21 other states throughout the US. Qualified NDs must undergo rigorous training before licensure.