The theory behind magnet therapy is that the magnetic fields produced by magnets (or by devices that generate electromagnetic current) can penetrate the human body and affect the functioning of individual cells and improve the working of the nervous system and various organs. Precisely how the magnetic fields do this remains a mystery, but there are several hypotheses. Some say that the electrical current created by magnets interrupts the transmission of pain signals in the central nervous system. Others claim that magnets increase blood flow to an area, boosting the flow of oxygen and other nutrients, and ultimately reducing pain and swelling.

　　The Chinese have believed for centuries that exposure to magnets leads to remarkably improved hair growth and improved hair condition.