This is why I wrote "mainly in the mind". :asian:It's always been interesting (to me) to see how evenly people seem to be divided between those who think magnetic fields will cure all ills, and those who think magnetic fields cause their ills.
There's no solid science to support either theory.
Years ago we used to supply some magnetic products if requested but I never recommended them or endorsed them. There was a Japanese trial about 20 years ago that demonstrated a change in blood flow under the influence of magnets but I never saw any study that conclusively showed benefit in relieving pain.
There is almost no scientific evidence supporting magnet therapy, though the occasional positive study does exist, e.g., "Randomised controlled trial of magnetic bracelets for relieving pain in osteoarthritis of the hip and knee"("British Medical Journal, Dec. 2004). This was a small study (194 subjects over 12 weeks) that found a slightly higher decrease in pain from osteoarthritis of the hip and knee in the group wearing magnetic bracelets as opposed to a "dummy group". The authors noted: "It is uncertain whether this response is due to specific or non-specific (placebo) effects." The reason they could not be certain that the magnets were responsible for anything is that it is very difficult "to blind subjects to the presence of a magnet" (Finegold and Flamm 2006).
http://www.skepdic.com/magnetic.html