The medical benefits of magnets have been touted since the days of ancient Greece, when Hippocrates reportedly used the magnetic rock lodestone to treat sterility. Ancient scientists theorize that magnets promote healing by stimulating blood flow to the affected area, bringing extra oxygen and nutrients while reducing toxins. Another hypothesis is that magnets create a field that alters how pain signals are sent along the nervous system.
In the early 16th century, the power of lodestone (Magnetite) to attract iron fillings without touching them suggested great power. Paracelsus, the famous Swiss alchemist and physician began using powdered lodestone to promote healing.
The current revival of magnetic therapy is being studied. There are new permanent magnet materials based on ferrites and rare-earth alloys. These new magnets are essential to high tech products ranging from miniature walk-man headphones to laptop computers, They can be fabricated into all sorts of shapes, even thin and flexible, allowing them to be inserted into shoes or sewn into mattresses.