Naturopaths claim to be holistic, which means they believe that the natural body is joined to a supernatural soul and a non-physical mind and the three must be treated as a unit, whatever that means. Naturopathy is fond of such terms as "balance" and "harmony" and "energy." It is often rooted in mysticism and a metaphysical belief in vitalism (Barrett).

Naturopaths are also prone to make grandiose claims about some herb or remedy that can enhance the immune system. Yet, only medical doctors are competent to do the tests necessary to determine if an individual's immune system is in any way depressed (Green). Naturopaths assume that many diseases, including cancer, are caused by faulty immune systems. (The immune system, in simple terms, is the body's own set of mechanisms that attacks anything that isn't "self." Although, in some cases rather than attack "foreign bodies" such as viruses, fungi, or bacteria, the immune response goes haywire and the body attacks it own cells, e.g., in lupus, multiple sclerosis, and rheumatoid arthritis.) Naturopaths also promote the idea that the mind can be used to enhance the immune system and thereby improve one's health. However Dr. Saul Green argues that