ALTERNATIVE HEALTH, QUACKERY
Definition A magnet that allegedly improves muscle strength, lifespan, blood flow, and vitality, and allegedly prevents or manages cancer, fibromyalgia, low back pain and many other evil humours.
There is no peer-reviewed data to suggest that magnets work as claimed. Worldwide sales of magnets for treatment is estimated at over $5 billion annually. In the US, the market is about $500 million.