Magnetic Therapy: Plausible Attraction?

A double-blind study at Baylor College of Medicine, published in November 1997 in the Archives of Physical and Rehabilitation Medicine, concluded that permanent magnets reduce pain in post-polio patients, and the results were heralded in 'The New York Times' and on 'Bryant Gumbel's Public Eye'. 'PBS's Health Week' and 'Time magazine' recently reported on the growing use of magnets by champion senior golfers and other professional athletes to relieve pain. Magnetic pain relief products are now sold in many golf shops, and ads for them appear in national golf and tennis magazines. Long a significant component of the health industry in Japan and China, magnetic therapy is becoming a more and more visible part of the alternative medicine boom in the United States and Europe. Is it all just hokum, as many previously assumed, or is magnetic therapy becoming scientifically respectable?

Early History

For thousands of years, wonder and magic were associated with the mysterious forces exerted by natural magnets - magnetite-rich rocks, today called lodestones. Many trace magnetic therapy back to Paracelsus (1493-1543), a physician and alchemist who reasoned that since magnets have the power to attract iron, perhaps they can also attract diseases and leach them from the body. Charles Mackay, in Extraordinary Popular Delusions and the Madness of Crowds (1841), says of Paracelsus that "his claim to be the first of the magnetisers can scarcely be challenged." But Paracelsus was also aware of the important role of the patient's mind in the process of healing (Buranelli 1975). He wrote, "The spirit is the master, the imagination is the instrument, the body is the plastic material. The moral atmosphere surrounding the patient can have a strong influence on the course of the disease. It is not the curse or the blessing that works, but the idea. The imagination produces the effect." Paracelsus was apparently well aware of the placebo effect.

The development in eighteenth-century England of carbon-steel permanent magnets more powerful than lodestones brought renewed interest in the possible healing powers of magnets, and among those interested was Maximilian Hell, a professor of astronomy at the University of Vienna. Hell claimed several cures using steel magnets, but he was rapidly eclipsed by a friend who borrowed his magnets to treat a young woman suffering from a severe mental illness. The friend was Franz Anton Mesmer (1734-1815), and Mesmer's success with the "magnets from Hell" led directly to his widespread promotion of his theory of "animal magnetism." Although he first used actual magnets, he later found he could "magnetize" virtually anything -- paper, wood, leather, water -- and produce the same effect on patients. He concluded that the animal magnetism resided in himself, the various materials simply aiding the flow of the "universal fluid" between him and the patients.

Mesmer became so successful in Paris that in 1784 King Louis XVI established a Royal Commission to evaluate the claims of animal magnetism, a commission that included Antoine Lavoisier and Benjamin Franklin among its members. They conducted a series of experiments and concluded that all the observed effects could be attributed to the power of suggestion, and that "the practice of magnetization is the art of increasing the imagination by degrees." Thomas Jefferson, arriving in Paris soon after the Commission report, noted in his journal: "Animal magnetism is dead, ridiculed."

Ridiculed, perhaps, but not dead. Mesmer himself faded from public view, but "magnetizing" persisted in various forms. Many early magnetizers evolved into students of hypnosis and developed various forms of hypnotherapy. (The trance induced in many of Mesmer's patients is thought to be what is now called a hypnotic trance, and most dictionaries today list mesmerism as a synonym for hypnotism.) One American who became interested in magnetic healing was Daniel David Palmer, who opened Palmer's School of Magnetic Cure in Iowa in the 1890s. His ideas developed into the system of hands-on therapy known as chiropractic. Others focused on hand gestures without actual touch, an approach recently reborn as "therapeutic touch." [See "Catching Up With Eighteenth Century Science in the Evaluation of Therapeutic Touch, " by Thomas S. Ball and Dean D. Alexander, this issue, p. 31] Mary Baker Eddy was "cured" by a magnetizer, but she later became convinced that cures could best be achieved through prayer, and founded Christian Science.

Most of these byproducts of mesmerism, like Mesmer himself, ceased to use actual magnets. But the development of electrical technology in the late nineteenth century impressed the general public with the mysterious powers of electric and magnetic fields, and therapeutic magnets had a rebirth, with many "doctors" promoting magnets to relieve pain, enhance sleep, and cure a wide variety of diseases. The most notable of these was Dr. C. J. Thacher, whom Collier's Magazine dubbed "King of the magnetic quacks" (Macklis 1993). His 1886 mail-order catalogue offered a variety of magnetic garments, and a complete costume contained more than 700 magnets, which provided "full and complete protection of all the vital organs of the body." In the twentieth century, materials scientists and engineers have developed stronger and stronger permanent magnets -- alnico magnets in the 1930s, ferrite (ceramic) magnets in the 1950s, and rare-earth magnets in the 1970s and 1980s. The latest rare-earth magnets, neodymium-iron-boron, are more than a hundred times more powerful than the steel magnets available in the last century to Edison, Bell, and C. J. Thacher (Livingston 1996). Both ferrite magnets and the latest "neo" magnets have had a tremendous impact on modern technology, but they have also restimulated interest in the use of permanent magnets for magnetic therapy. Most magnetic therapy products today, like most refrigerator magnets, contain inexpensive ferrite magnets, but many suppliers offer neodymium "supermagnets" in their top-of-the-line products.

Magnetic Therapy Today

Both ferrite and rare-earth magnets, unlike earlier magnetic materials such as steels and alnicos, have great resistance to demagnetization, allowing thin disks to be magnetized. (Earlier magnets had to be long and thin to avoid being demagnetized by the internal fields produced by the poles at the ends.) This feature allows modern magnets to be mounted in a variety of thin products that can be applied to the body with the magnetic field emanating from the surface.

Many magnetic necklaces, bracelets, and earrings are formed from silver- and gold-rich magnetic alloys and promoted as both fashionable and therapeutic. One catalog claims magnetic earrings "stimulate nerve endings that are associated with head and neck pain," and magnetic bracelets "act upon the body's energy field" and "correct energy imbalances brought by electro-magnetic contamination or atmospheric changes." Larger items include magnetic seat cushions, magnetic pillows, and magnetic mattress pads, the last claiming to produce an "energizing sleep field." One supplier offers a PCD -- Prostate Comfort Device for older men. If properly placed while you sit watching television or driving your car, you will no longer have to get out of bed several times a night to relieve yourself!

To avoid trouble with the Food and Drug Administration, most suppliers emphasize only "comfort" and usually specifically state "no medical claims are made." Some, however, are far less careful. One company in Kansas markets a book entitled Curing Cancer With Supermagnets. The authors of the book claim to have cured cancer simply by hanging a neodymium "supermagnet" around the patient's neck. The cancer discussed in the advertisement was a breast cancer, but they report that "the supermagnets influence the whole body" and "our method can cure all types of cancer."

Many magnetic therapy products have alternating arrays of north and south poles facing the patient. Some have detailed explanations of why a circular pattern of poles is optimal, while others offer poles in checkerboard or triangular patterns. Nikken, the Japan-based firm that has used a multilevel marketing scheme to expand from an annual business in the U. S. of $3 million in 1989 to $150 million today, primarily offers products with alternating poles.

One clear difference between such multipolar magnetic devices and unipolar devices (with only one pole facing the patient) is the "reach" of the magnetic field. The field from even unipolar magnets decreases very rapidly with increasing distance from the magnet, but the field from multipolar magnets decreases much more rapidly. If multipolar magnets really have any effects on the human body, they will be limited to depths of penetration of only a few millimeters. (Many refrigerator magnets are multipolar, which limits the thickness of paper they can hold to the refrigerator, but also limits the damage they can do to nearby credit and ATM cards.)

Other suppliers offer only unipolar magnets, and some emphasize the importance of having only south-seeking poles facing the body. Contrary to common scientific usage, they call south-seeking poles north poles. Since opposite poles attract, they argue that a pole that seeks south must be a north pole. (Here practitioners of magnetic therapy are perhaps more logical than mainstream science, which calls the south-seeking pole a south pole, requiring that the earth's magnetic pole in Antarctica is, by the standard scientific terminology, a north pole.) Dr. Buryl Payne, in his book The Body Magnetic (1988), argues that south-seeking poles calm tissue but north-seeking poles stimulate tissue, and you should therefore never expose tumors or infections to north-seeking poles. When I suggested to one practitioner that different effects from different poles seemed to violate basic rules of symmetry, he assured me that the rules were reversed in the southern hemisphere.

One of the most ardent advocates of magnetic therapy is Dr. William Philpott of Oklahoma, who publishes his own Magnetic Energy Quarterly. He is also on the board of the Bio-Electro-Magnetics Institute of Reno, Nevada, a nonprofit "research and educational organization" and an advisor to the NIH Office of Alternative Medicine. His wife happens to have a business selling "Polar Power Magnets." Dr. Ronald Lawrence of California is President of the North American Academy of Magnetic Therapy and reports that he has successfully used magnets to relieve pain in hundreds of his patients. He is associated with Magnetherapy, a Florida company that markets "Tectonic Magnets." Both Dr. Philpott and Dr. Lawrence favor unipolar magnets.

The efficacy of magnetic therapy (or of any other medical treatment, mainstream or alternative) does not depend on our understanding the biological mechanism. Nevertheless most promoters of magnetic therapy recognize the need for offering some plausible explanation. The mechanism most commonly offered for various therapeutic effects of magnets is improved blood circulation, despite a lack of clear evidence for such an effect. Other suggestions include alteration of nerve impulses, increased oxygen content and increased alkalinity of bodily fluids, magnetic forces on moving ions, and decreased deposits on the walls of blood vessels.

The broadest explanation was presented by Dr. Kyochi Nakagawa of Japan, who claims that many of our modern ills result from "Magnetic Field Deficiency Syndrome." The earth's magnetic field is known to have decreased about 6 percent since 1830, and indirect evidence suggests that it may have decreased as much as 30 percent over the last millennium. He argues that magnetic therapy simply provides some of the magnetic field that the earth has lost.

Magnetic therapy is also prominent in the treatment of thoroughbred racehorses. An injured racehorse represents potential loss of a substantial investment, providing considerable incentive to try "alternative medicine" to supplement mainstream veterinary treatment. Magnetic pads for a variety of leg problems, magnetic blankets, magnetic hoof pads, etc., all get ringing endorsements from many horse trainers -- and even some veterinarians. One marketer of magnetic products for humans reports that he first became convinced of their effectiveness when he used them on his ailing llama! Enthusiasts argue that the placebo effect could not be effective on horses or other animals, but forget that it may influence the human who is interpreting the effect of magnetic therapy on the animal.