How to Use Magnets for Healing and Pain Relief

Magnetic therapy spans a wide range of devices and claims, from refrigerator-strength magnets sewn into knee wraps to clinical-grade pulsed electromagnetic field (PEMF) machines used under medical supervision. The evidence behind these approaches varies enormously depending on the type of magnet, the condition being treated, and how the device is used. Some applications have earned FDA clearance and show real promise in clinical trials, while others rest on little more than marketing and the placebo effect. Understanding which is which matters before you spend money or time on any magnetic product.

Static Magnets Versus Pulsed Electromagnetic Fields

The first thing to sort out is that “magnet therapy” is not one thing. The two broad categories work differently, have different levels of evidence, and are used for different purposes.

Static magnets are the kind you can hold in your hand. They produce a constant magnetic field that does not change over time. These are the magnets embedded in bracelets, shoe insoles, mattress pads, and knee wraps sold in drugstores and online. Their field strengths typically range from a few hundred to a few thousand gauss at the surface, dropping off rapidly with distance from the skin.

Pulsed electromagnetic fields (PEMFs) are generated by running electrical current through a coil at a set frequency. The magnetic field rises and falls with each pulse, creating a dynamic signal that penetrates tissue. Clinical PEMF devices operate at low frequencies, generally in the range of 0.5 to 100 Hz, and their fields pass through the body more effectively than static magnets because tissue does not block magnetic fields the way it blocks electrical current.¹ The FDA has cleared specific PEMF devices for treating nonunion bone fractures, and some newer applications in post-surgical recovery and pain management have accumulated meaningful clinical data.²

The distinction matters because most of the strongest evidence applies to PEMF devices used in specific medical contexts, not to the static magnets in consumer products. Lumping them together is one of the biggest sources of confusion in this space.

The Blood Flow Myth

One of the most common claims you will encounter is that magnets “increase blood flow” or “improve circulation,” which supposedly explains their healing properties. This is the pitch behind many magnetic bracelets, wraps, and insoles. The problem is that the research does not back it up.

A 2025 review examining both human and animal studies on static magnetic fields and blood flow found that no human study showed an increase in blood flow. One human study actually showed a decrease. The animal evidence was mixed but largely unsupportive, with several studies finding no change and those reporting increases having methodological concerns.³ A separate study specifically measuring skin blood flow under locally applied magnets found that the magnets caused a reduction in resting blood perfusion, not an increase, and this effect was the same regardless of which pole faced the skin.⁴ Another study in healthy volunteers found no detectable effect at all on skin blood flow or temperature during magnet exposure.⁵

If anyone tells you a magnetic product works by increasing circulation, treat that as a red flag. The claim is not supported by human evidence and directly contradicted by some of the more careful studies. Whatever magnets may do, boosting blood flow does not appear to be the mechanism.

How PEMF Devices Might Actually Work

The biological effects of pulsed electromagnetic fields are more interesting and better supported than those of static magnets, though the full picture is still being assembled. The leading explanations center on how changing magnetic fields interact with cells at the molecular level.

One well-studied pathway involves calcium signaling. When cells are exposed to pulsed fields, the concentration of calcium ions inside the cell can change, and calcium acts as a key messenger for many cellular processes. Lab studies on nerve cells have shown that PEMF exposure increases intracellular calcium through voltage-gated calcium channels, which in turn triggers increased production of brain-derived neurotrophic factor (BDNF), a protein involved in nerve growth and repair.⁶ A related line of research found that configured electromagnetic signals affected calmodulin-dependent signaling, producing several-fold increases in nitric oxide and other second messengers in cartilage and blood-vessel cells.⁷

Another mechanism involves inflammation. Multiple cell-culture studies have found that PEMF exposure reduces the production of pro-inflammatory molecules. In microglial cells (the brain’s immune cells), pulsed fields lowered levels of TNF-α, IL-1β, IL-6, and IL-8, and also reduced harmful reactive oxygen species generated under oxygen-deprived conditions.⁸ Follow-up work mapped part of this anti-inflammatory effect to a specific signaling pathway (JNK), suggesting the effect is not random but operates through identifiable cellular machinery.⁹ A 2025 study using a graphene-based magnetic device confirmed similar reductions in inflammatory markers and oxidative stress in human immune cells.¹⁰

These are laboratory findings, not proof that holding a magnet against your knee accomplishes the same thing. But they do show that electromagnetic fields can genuinely influence cells in ways that are relevant to pain and healing, which separates PEMF from pure pseudoscience. The gap is between what happens in a controlled lab environment with precisely calibrated fields and what happens with a consumer product strapped to your wrist.

Where the Clinical Evidence Is Strongest

The firmest ground for magnetic therapy is in bone healing. The FDA cleared PEMF devices as a safe and effective treatment for nonunion fractures, meaning bones that have failed to heal on their own after a standard recovery period.² A large follow-up study covering nearly 1,400 patients with nonunion fractures treated with PEMF reported an overall success rate of about 90%. Patients who used the device for nine or more hours per day healed an average of 76 days sooner than those who used it three hours or less.¹¹ In a separate randomized controlled trial on delayed-union long-bone fractures, PEMF treatment over about five months achieved a healing success rate of roughly 77%, compared to about 48% in the control group.¹²

Post-surgical recovery is another area with growing evidence. In a double-blind trial on breast reconstruction patients, those treated with PEMF had about half the wound drainage volume at 24 hours compared to the sham group, and five-fold lower levels of a key inflammatory marker in wound fluid.¹³ After jaw surgery, patients who received PEMF therapy alongside standard care had significantly more swelling reduction (about 6% of initial volume) compared to the standard-care-only group (about 3%).¹⁴ A broader review described PEMF as a tool with no known side effects for managing postoperative pain and swelling in plastic surgery contexts.¹⁵

Chronic Pain and Nerve Problems

For chronic pain conditions, the evidence is more encouraging with PEMF than with static magnets, though it remains mixed depending on the specific condition. Diabetic neuropathy is one area where both types of magnets have been tested with some positive signals. In a randomized double-blind trial, patients using static magnetic insoles experienced meaningful reductions in burning pain, numbness and tingling, and exercise-related foot pain over four months, with greater improvements in those who had more severe symptoms at the start.¹⁶ A more recent trial found significant improvements in neuropathy symptom scores, disability scores, pain ratings, and quality of life after 12 weeks of static magnetic field exposure, with no comparable improvement in the sham group.¹⁷

The story gets muddier with conditions like fibromyalgia. One pilot study found that sleeping on a magnetic mattress pad (delivering 200 to 600 gauss at the skin surface) produced significant decreases in pain, fatigue, and tender-point scores over 16 weeks, with improved sleep, while the sham group saw no comparable changes.¹⁸ But a separate trial testing static magnet pads for fibromyalgia found that while one magnetic pad group had greater pain reduction, there were no significant differences between groups for tender-point counts, total tender-point pain intensity, or functional status.¹⁹ These are small studies, and the inconsistency makes it hard to draw firm conclusions.

Knee Pain and Osteoarthritis

Knee pain is one of the most popular targets for consumer magnetic products, and the evidence here is a useful case study in why you should be cautious. A double-blind study of static magnets applied to painful knees found significant improvements in self-reported pain and physical function in the magnet group compared to the sham group.²⁰ However, a pilot trial of static magnets for knee osteoarthritis found significant short-term pain relief at four hours but no meaningful difference at six weeks, suggesting the effect may not last.²¹ A separate randomized trial testing magnetic knee wraps found no significant improvement in joint position sense, and the sham wrap actually performed better on that measure.²²

The bracelet story follows a similar pattern. A crossover trial testing standard magnetic wrist straps, weak magnetic straps, copper bracelets, and demagnetized placebo straps in osteoarthritis patients found no difference between any of the devices on the main pain and function measures. One secondary analysis did show slightly lower sensory pain scores with the standard magnetic strap, but across the primary outcomes, the magnetic bracelet did no better than the placebo.²³

The Placebo Problem

Placebo effects are especially tricky in magnet research because people have strong prior beliefs about whether magnets can help. A randomized trial of magnetic versus sham insoles for plantar heel pain noted that participants who already believed magnets had significant potential to relieve pain were somewhat more likely to respond to either device. Because participants were blinded, the researchers suggested the magnitude of the placebo effect in real-world magnet use, where people knowingly buy a magnetic product, could be even larger.²⁴

This is not an argument that magnetic therapy is entirely placebo. The bone-healing data and some of the PEMF surgical studies use hard endpoints like X-ray-confirmed healing or measured wound drainage volumes, which are less susceptible to expectation effects. But for subjective outcomes like self-reported pain, the placebo contribution is likely substantial, and you should keep that in mind when evaluating your own experience with any magnetic product.

Safety and Who Should Avoid Magnets

For most people, the physical risks of consumer magnetic products are low. No serious adverse events have been reported in the trials discussed here, and PEMF reviews consistently describe the treatment as having no known side effects in the populations studied. But there is one group for whom magnets pose a genuine and potentially life-threatening risk: people with implanted cardiac devices.

Pacemakers and implantable cardioverter-defibrillators (ICDs) contain magnetic sensors that can be tripped by external magnetic fields. A case report showed that even the relatively weak magnets in a fitness tracker wristband were capable of deactivating ICD therapies at clinically relevant distances, because these devices sit just under the skin. The consequences can be severe. Deactivating an ICD’s ability to detect and correct dangerous heart rhythms could leave a life-threatening arrhythmia untreated. In pacemakers, magnet interference can switch the device to an asynchronous pacing mode that risks triggering a dangerous rhythm on its own.²⁵ The FDA has recommended that patients keep any consumer electronic device that may create magnetic interference at least six inches away from implanted pacemakers and defibrillators.²⁶

It is worth noting that one study testing smartwatches and their magnetic chargers found no interference with cardiac devices in controlled testing.²⁷ But the magnets in therapeutic products are often considerably stronger than those in a smartwatch, and the six-inch buffer zone is a sensible precaution. If you have any type of implanted cardiac device, do not use magnetic therapy products without discussing it with your cardiologist first.

A Practical Guide to What Is Worth Trying

If you are considering magnetic therapy, the most important question is what kind of device and what kind of condition. Here is a rough guide based on where the evidence currently sits:

FDA-cleared PEMF for bone healing: This is the one area with strong, well-replicated evidence. If you have a nonunion or delayed-union fracture, ask your orthopedic surgeon about PEMF bone-growth stimulation. Compliance matters: using the device for many hours per day appears to meaningfully speed recovery.
PEMF for post-surgical pain and swelling: The evidence from controlled trials is encouraging, particularly for reducing inflammation in the days after surgery. Some plastic surgeons and oral surgeons already offer this as an adjunct treatment.
Static magnets for diabetic neuropathy: A couple of well-designed trials show meaningful symptom improvement. If you have burning or tingling from diabetic neuropathy and standard treatments are not enough, magnetic insoles or wraps might be worth discussing with your doctor as a low-risk add-on.
Magnetic bracelets and wraps for arthritis: The evidence here is weak and inconsistent. Some short-term pain relief has been reported, but it tends to fade quickly, and the most rigorous trials show no advantage over placebo. These products are unlikely to cause harm, but they are also unlikely to do much beyond what a comfortable, snug-fitting wrap would accomplish on its own.
Magnetic mattress pads for fibromyalgia: A few small studies suggest benefit, but they are too small and too few to be confident. If you already sleep poorly and want to try one, the downside risk is financial rather than physical.

Transcranial Magnetic Stimulation and Brain-Targeted Applications

The most scientifically advanced use of magnets in medicine sits far from the consumer-product aisle. Transcranial magnetic stimulation (TMS), which uses focused magnetic pulses to stimulate specific brain regions through the skull, has become an established treatment for drug-resistant depression and is being studied for chronic pain. A meta-analysis of high-frequency repetitive TMS applied over the left prefrontal cortex found no significant short-term pain relief, but the mid-term and long-term effects on chronic pain were significant, and the treatment also helped with the depressive symptoms that often accompany chronic pain.²⁸

TMS requires specialized equipment and trained operators and is delivered in a clinical setting, so it is fundamentally different from strapping a magnet to your knee. But it is worth knowing about because it represents the clearest proof of concept that magnetic fields can directly alter nervous system function in meaningful ways. The historical thread connecting the two is surprisingly long. Franz Anton Mesmer promoted “animal magnetism” as a healing force in the 1700s and was widely dismissed as a fraud, yet his ideas arguably helped spark the line of inquiry that eventually led to modern electromagnetic brain stimulation.²⁹

Do Magnets Work for Animals?

Magnetic therapy products for horses and dogs have become a sizable market, often sold with the same claims about improved circulation and pain relief. The animal research, however, mirrors the human story: it depends heavily on what you are actually measuring. A randomized, double-blind, placebo-controlled trial of PEMF for back pain in polo ponies found that pressure-pain thresholds changed nearly equally after both PEMF and placebo treatments, with no consistent pattern favoring the active device. The researchers concluded that the effect of PEMF on back pain could not be demonstrated in that study.³⁰

Animal trials are interesting because they remove one confounding factor: horses do not know whether they are getting the real treatment or a sham, which eliminates the expectation-driven placebo effect that complicates human pain studies. When PEMF fails to outperform placebo in an animal trial using objective pain measurements, it is harder to explain the result away. This does not mean magnetic therapy never helps animals, but the blanket marketing claims for veterinary magnetic products should be viewed with the same skepticism as their human counterparts.