Abstract: A flexible therapeutic magnetic sheet, e.g., fabricated from randomly-distributed ferromagnetic particles mixed in a plastic resin and formed into a sheet. A magnetic field is applied to the sheet to permanently magnetize the sheet according to a spiral pattern. The spiral pattern comprises a Northern pole spiral interlaced with a spiral pole Southern. When the therapeutic sheet is applied to the skin of a person or an animal, the ions and electrolytes in the blood traverse alternating polarity magnetic fields. The alternating polarity magnetic fields exert magnetic forces in alternating directions on the ions and electrolytes in the blood, thus generating heat in the blood vessels and increasing the blood circulation.