The human body produces complex electrical activity in all types of cells, including neurons, endocrine and muscle cells. All electrical activity generates a magnetic field. The body's biological magnetic field is very small, but it can be measured by techniques such as magnetic electroencephalography (MEG) or magnetic echocardiography (MCG). These techniques measure the magnetic field generated by the body's electrical activity. Cells typically undergo more than 7,000 chemical reactions per second. This represents a complex and ongoing process of adaptation that is beyond the scope of simple biochemistry.

The electrical activity of the body mainly occurs in the cell membranes. It is very important that the cell membrane maintains the proper "charge" or voltage. Healthy cells have a transmembrane potential of about 80 to 100 millivolts. Compared to healthy cells, cancer cells have a low transmembrane potential of 20 to 25 millivolts. When a cell is damaged or sick, the voltage on the cell membrane drops and the voltage inside the cell increases. When the membrane voltage is lowered, the membrane channels do not work properly, resulting in a domino effect of disease-induced action-cell inactivity. The cell membrane acts as a gatekeeper, like a doorway to protect the cell's contents and allow ions to flow. These channels are sometimes called "pumps." 

The cell membrane itself has a voltage called "potential." Membrane potential is the difference in charge between the inside and outside of the cell, and the membrane channel opens or closes depending on the polarity of the membrane. When the channel is closed, the cell membrane is at "break potential" and when open, it is at "action potential".

Action potential (open channel) requires electrical activity. In this process, the potential of the membrane rises rapidly, opening the channel. When a channel is opened, ions enter the cell and the membrane potential increases further, causing more channels to open. This process generates a current magnetic field across the cell membrane and the cycle continues. Once all channels are open, the membrane potential is so great that the polarity of the membrane reverses, and then the channel begins to close. When the entry channel is closed, the end channel is activated. When the process is complete all channels are closed and the membrane is brought back to a standstill.

As such, only certain ions flow in and out of the cell. The most common ions are sodium, calcium and potassium. The primary type of action potential is often referred to as a "sodium-potassium pump," during which sodium flows into the cell through the inlet channel and potassium flows out of the cell through the outlet channel. 

Action potentials play a different role depending on the cell type, but usually activate cellular communication or cellular processes. For example, muscle cells use action potentials as the first step in achieving muscle contraction.

If the cells are hurt or in poor health, this activity will slow down or stop. The energy required for action potentials is relatively small, but problematic cells cannot work. The application of an external therapeutic magnetic field to the body supports this function by providing the cell with energy that the cell cannot produce on its own. This is the most important reason our body cells need a magnetic field.