Magnet therapy is a form of alternative medicine that involves placing weak permanent magnets on the body, typically through products like bracelets, jewelry, straps, insoles, mattresses, and magnetic blankets. Practitioners claim that exposing parts of the body to static magnetic fields can improve health, commonly suggesting enhanced blood flow, pain relief, or restoration of a vague “electromagnetic energy balance.” These claims are not supported by mainstream medicine.
From a physical standpoint, the magnets used in these products are many orders of magnitude too weak, and their fields decay too quickly with distance, to have any measurable effect on hemoglobin, blood flow, tissue oxygenation, or organs. Even in much stronger magnetic fields used in MRI scanners, the dramatic biological effects claimed by magnet therapy proponents are not observed. A key practical issue in research is blinding: people can often tell whether a magnet is real by its attraction to metal, and inadequate blinding tends to exaggerate small or placebo-level effects.
Systematic reviews up to 2012 examining magnet therapy for pain, osteoarthritis, and rheumatoid arthritis found insufficient or negative evidence for efficacy, and agencies like the American Cancer Society and the U.S. National Center for Complementary and Integrative Health report no demonstrated benefit on pain, nerve function, cell growth, or blood flow. While the devices themselves are generally safe, they can interfere with pacemakers and similar implants, and they carry financial and opportunity costs when they replace effective treatment. Despite this, magnet therapy remains a billion‑dollar global industry, subject to strict legal limits on medical claims, especially in the United States.