From the NYTime’s health blog:
British researchers randomized 65 patients with rheumatoid arthritis to receive one of four treatments: wearing a powerful magnetic wrist strap, a weak magnetic strap, a non-magnetic strap and a copper bracelet. Each patient wore each device for five weeks and completed pain surveys. The study appears in the September issue of PLoS One.
The patients reported pain levels using a visual scale, ranging from “no pain” to “worst pain ever,” and recorded how often their joints felt tender and swollen. Researchers used questionnaires to assess physical limitations, and tested for inflammation by measuring blood levels of C-reactive protein and plasma viscosity.
There was no statistically significant difference in any of these measures regardless of which type of device patients were wearing.
It’s been nearly 10 years since the last time I bothered to write about a study showing that magnet therapy is bullshit, but it appears the popularity of this particular kind of snakeoil hasn’t waned in that time. Estimates are that the sales of magnet bracelets tops $1 billion a year worldwide despite there not being one double blind, randomized testing showing they have anything more than a placebo effect. And that’s just the bracelets. You can buy all manner of things with “healing” magnets in them these days from insoles to underwear.
The only good news to be had is that there are so many people pumping these craptastic products out these days that if you’re gullible enough to buy into the nonsense you won’t end up wasting huge amounts of money on them as they tend to be cheap.