A device for treatments on the human body with variable magnetic fields, comprising: - at least one Helmholtz coil to be brought close to the person or persons to be treated and adapted to produce variable low-intensity and low-frequency magnetic fields; at least one electric waveform generator connectable to said at least one Helmholtz coil; - at least one impedance meter, with electrode terminals to be applied to the person in order to assess the effectiveness of the waves of the generator; - at least one additional device for measuring physiological parameters of the patient, which is chosen from the group comprising: i) a device for measuring heart rate of the patient; ii) a device for measuring electrical activity of the heart of the patient; iii) a device for measuring respiratory functionality of the patient; iv) a device for measuring electrical activity of the brain; and combinations thereof; - a device for measuring the intensity of the terrestrial static magnetic field along the axis of the field generated by the applicator; - and a device for storing the intensity of the terrestrial static magnetic field; - at least one electronic processing unit for the management of the at least one waveform generator as a function of the measurements of the impedance meter and of memory parameters stored in the processing unit; said at least one electric waveform generator having a first mode of use in association with said impedance meter and other parameters obtained from the at least one additional device for the optimization of the waveforms with which the body of a specific patient is to be treated, and a second mode of use in which said electric waveform generator delivers to the specific patient the waveform or waveforms identified by the management electronic processing unit, wherein in said first mode of use, the device for measuring the intensity of the terrestrial static magnetic field measures the intensity of the terrestrial static magnetic field; and wherein in the second mode of use, the data item related to the intensity of the terrestrial magnetic field measured in the second mode of use is sent to said data processing unit, which is adapted to act on the waveforms identified by the management electronic processing unit on the basis of a database for correlation of ion mobility as a function of the intensity of the terrestrial magnetic field. - at least one Helmholtz coil to be brought close to the person or persons to be treated and adapted to produce variable low-intensity and low-frequency magnetic fields; at least one electric waveform generator connectable to said at least one Helmholtz coil; - at least one impedance meter, with electrode terminals to be applied to the person in order to assess the effectiveness of the waves of the generator; - at least one additional device for measuring physiological parameters of the patient, which is chosen from the group comprising: i) a device for measuring heart rate of the patient; ii) a device for measuring electrical activity of the heart of the patient; iii) a device for measuring respiratory functionality of the patient; iv) a device for measuring electrical activity of the brain; and combinations thereof; i) a device for measuring heart rate of the patient; ii) a device for measuring electrical activity of the heart of the patient; iii) a device for measuring respiratory functionality of the patient; iv) a device for measuring electrical activity of the brain; and combinations thereof; - a device for measuring the intensity of the terrestrial static magnetic field along the axis of the field generated by the applicator; - and a device for storing the intensity of the terrestrial static magnetic field; - at least one electronic processing unit for the management of the at least one waveform generator as a function of the measurements of the impedance meter and of memory parameters stored in the processing unit; said at least one electric waveform generator having a first mode of use in association with said impedance meter and other parameters obtained from the at least one additional device for the optimization of the waveforms with which the body of a specific patient is to be treated, and a second mode of use in which said electric waveform generator delivers to the specific patient the waveform or waveforms identified by the management electronic processing unit, wherein in said first mode of use, the device for measuring the intensity of the terrestrial static magnetic field measures the intensity of the terrestrial static magnetic field; and wherein in the second mode of use, the data item related to the intensity of the terrestrial magnetic field measured in the second mode of use is sent to said data processing unit, which is adapted to act on the waveforms identified by the management electronic processing unit on the basis of a database for correlation of ion mobility as a function of the intensity of the terrestrial magnetic field.