Bioresonance therapy is used to diagnose and treat cancer, allergies, arthritis, and various chronic degenerative diseases. A variation known as electrodermal testing was developed as an aid in prescribing homeopathic remedies and is used in Europe and Hungary as well for the diagnosis of allergies. Bioresonance is based on the claim that electromagnetic oscillations emitted by diseased organs and cancer cells vary from those emitted by healthy cells due to their differences in cell metabolism and DNA damage. No evidence supports these claims. Treatment may involve removal and replacement of dental alloys or amalgams, which are said to carry currents that "alter the body's electromagnetic circulatory system." The Food and Drug Administration has prosecuted numerous purveyors of electrical devices for making unsubstantiated health benefit claims. A randomized, double-blind trial of bioresonance in the treatment of atopic dermatitis in children showed no efficacy. Clinical trials evaluating electrodermal testing show no reliability in diagnosing allergies. No clinical trials evaluate bioresonance therapy for use in cancer, likely due to its spurious scientific basis. The American Cancer Society advises patients not to seek treatment with unproved electronic devices.

Bioresonance is based upon the unproved premise that the electromagnetic oscillations emitted by damaged organs and cancer cells vary from those emitted by healthy cells due to their differences in cell metabolism and DNA damage. An electrical device supposedly detects these differences and can determine which organs are affected and "cancel out" their diseased signal via destructive wave interference.

Electrodermal testing developed as an aid in prescribing homeopathic remedies; medicines are tested "to determine how well they resonate with the individual or how similar they are to the body frequencies needing enhancement to overcome an illness." Practitioners claim the wave emission from homeopathic medicines or allergens is measured through the device and is modulated through the patient's autonomic nervous system, influencing skin resistance. No evidence supports any of these claims.

Some proponents claim the device naturally kills tumor cells by releasing "suppressed" tumor suppressor genes or attenuating overactive oncogenes. This hypothesis is untenable because of the irreversibility of most cancer-causing genetic mutations.  An evaluation of one device found that a galvanic skin response of low resistance was not a reliable indicator of vertebral pathology, and that the device produced a low-resistance reading after 5 seconds of application to any point on the body. Proponents of bioresonance often confuse electric current with electromagnetic waves, which have different physiological effects.

source: mskcc.org