Magnet therapy  

(also known as magnetic field therapy or biomagnetic therapy) involves using magnets, magnetic devices, or magnetic fields to treat a variety of physical and emotional conditions, including circulatory problems, certain forms of arthritis, chronic pain, sleep disorders, and stress. Treatments may be applied by a practitioner or as part of a self-care program.  Static magnets whether being placed over the sites of interest and magnetic shoes and mattresses have shown no benefit whatsoever.  Electromagnet therapy with large electromagnets are effective for migraine treatment.

Painbytes assessment:  two thumbs down for static magnets, magnetic shoes, magnetic bracelets, or magnetic mattresses.  Studies have shown these to be scams.