Magnet Therapy (Static Magnets, Magnetotherapy)

No mechanism has been established, and the proposed ones do not survive inspection. Claims that magnets increase blood flow founder on the fact that haemoglobin iron is not ferromagnetic. Claims about ion channels run into geometry: a small magnet's field falls away steeply with distance, so a bracelet delivers little to tissue even a centimetre in. Finegold and Flamm's BMJ argument is the cleanest. If tissue responded to static fields, MRI scanners, far stronger, would produce dramatic effects. They produce neither harm nor healing.

Most of the published research on this comes from one place. 100% of it is from Lodestone medicine appears independently in Greek, Chinese, Indian and Tibetan sources; the modern wearable static magnet is a twentieth-century commercial product sold worldwide. Findings that no unrelated group has reproduced are weaker than the study count makes them look.

Two distinct things share one name, and the confusion is commercially useful. The older thread is lodestone as a mineral drug, ci shi in China, kanta loha in Ayurveda, khab len in Tibet, generally purified, calcined and swallowed rather than worn, and prescribed for agitation, insomnia and tinnitus rather than for joints. The second thread runs from Paracelsus through Mesmer, whose animal magnetism kept the vocabulary of magnetism after abandoning actual magnets, and whose collapse under the 1784 Franklin Commission left the word available for reuse. Postwar manufacturers picked it up for a consumer product, the wearable static magnet, and the marketing has since borrowed antiquity from the first thread to lend depth to the third. The retail bracelet has no lineage in classical Chinese or Ayurvedic practice.

Lodestone entered medicine long before anyone could say what magnetism was, and it did so more than once. The Greek word for the stone comes from Magnesia in Asia Minor, where it was found. Chinese materia medica records magnetite as a mineral drug within the first millennium CE, and Ayurvedic rasashastra developed elaborate purification and calcination methods for it. Paracelsus in the early sixteenth century applied lodestones to seizures and psychiatric disorders, reasoning that a stone which drew iron might draw disease. The tradition's most consequential moment came in Vienna and Paris. Franz Anton Mesmer, influenced by the astronomer Maximilian Hell's magnetic treatments, began passing magnets over patients in the 1770s, then concluded that the magnets were unnecessary and that the healing force was an invisible fluid flowing through him, which he called animal magnetism.

1. AntiquityLodestone takes its Greek name from Magnesia in Asia Minor and enters classical medical writing as a stone with occult power over iron.
2. First millennium CEChinese materia medica records magnetite as ci shi, a heavy mineral drug used internally to settle the spirit; Ayurvedic rasashastra develops kanta loha bhasma from the same ore.
3. Early 1500sParacelsus applies lodestones to seizures and psychiatric disorders, reasoning by analogy from the stone's pull on iron.
4. 1770sFranz Anton Mesmer treats patients with magnets in Vienna, then abandons them for animal magnetism, an invisible fluid he claims to channel directly.
5. 1784The Royal Commission under Louis XVI, including Benjamin Franklin and Antoine Lavoisier, uses sham and blinded procedures to test animal magnetism and finds no magnetic fluid, attributing the effects to imagination.
6. 2003Winemiller and colleagues report in JAMA that magnetic insoles are no better than sham insoles for plantar heel pain.
7. 2006Finegold and Flamm publish 'Magnet therapy: extraordinary claims, but no proved benefits' in the BMJ.
8. 2007Pittler, Brown and Ernst publish the pooled meta-analysis in CMAJ finding no effect on pain.
9. 2013Richmond's randomised crossover trial in PLoS ONE finds magnetic wrist straps and copper bracelets no better than placebo in rheumatoid arthritis.

Naturally magnetised magnetite carried medical meaning across several unconnected traditions. Chinese materia medica lists it as ci shi, a heavy mineral taken internally to settle the spirit and anchor rising liver yang, prescribed for insomnia, palpitations, tinnitus and dizziness. Ayurvedic rasashastra knows magnetite as kanta loha or ayaskanta, processed into bhasma. Tibetan sources call it khab len. The stone's power over iron was read as a power over the body, and in each case it was swallowed or applied, not worn as jewellery.

Pooled effect on pain

2.1 mm on a 100 mm scale, 95% CI -1.8 to 5.9, p = 0.29 (Pittler 2007)

Global market

Estimated above USD 1 billion a year, roughly USD 300 million in the US (BMJ 2006)

NCCIH position

Scientific evidence does not support the use of magnets for pain relief

Main real hazard

Interference with pacemakers, ICDs and insulin pumps

What follows is unfinished work on our side, not a finding about Magnet Therapy (Static Magnets, Magnetotherapy). A short entry is not a safe entry.

• Cost and market. We have not documented what it sells for or who sells it.
• Supply chain. We have not mapped where it is made.
• Who uses it. We have not documented the user groups.
• What could change. No forward-looking summary yet.
• How it compares. We have not set it against the alternatives.
• Children and teenagers. We have not checked what is known about younger people.
• What people take it for. We have not catalogued the claims made for it.