Healing Magnets. A Guide For Pain Relief, Speed... Link

: Unipolar magnets have one side (usually North) facing the skin, while bipolar magnets alternate poles to create a more complex field. Safety and Precautions

Not all magnets are created equal. For therapeutic use, the "gauss" rating (a measurement of magnetic strength) is critical. Healing Magnets. A Guide for Pain Relief, Speed...

: These require an electric current to create a field and are typically used in clinical settings (such as PEMF therapy). : Unipolar magnets have one side (usually North)