What my acupuncture doctor told me is that most magnets marketed as "therapeutic" are way too weak to do any good. He had me buy some of the rare earth magnets from Radio Shack ($3 for two) and tape them onto specified points. Those are some really strong magnets and they really seemed to help. But I was constantly worrying about getting them near my hard drive, especially when they'd fall off while I was asleep and then I wouldn't be able to find them right away... Not exactly jewelry, either.

I by no means believe that any human science individually, nor all of them combined, knows everything there is to know about the human body.