Do energy levels above 10 milli Tesla always work?

NO! The speed of change of the electromagnetic field is the key factor in establishing the conditions for maximum effectiveness within the cells of body tissues. This speed of magnetic pulsation is one of the most important parameters for obtaining clear pictures in Magnetic Resonance Imaging (MRI) machines. By generating high speed tilting of hydrogen atoms in the body, these atoms emit the radio frequency signals measured by the MRI coils used to create the diagnostic picture. A static magnetic field cannot generate any effect inside the cells of the body as there is no speed of change component when applying a permanent magnetic field.