Is Magnet Therapy for Horses Effective? Scientific Overview

Magnetic therapy for horses is impossible to miss on a British competition yard: magnetic rugs over showjumpers cooling down, magnetic boots strapped to the legs of older event horses, poll covers, hock wraps and travel boots. Some owners swear by them. A good many UK and South African vets are openly sceptical. Both camps deserve the same thing, which is a straight answer to one question: what does the published, peer-reviewed evidence actually show?

This guide goes to the primary literature rather than to manufacturer claims. It separates the two very different technologies sold under the magnet therapy label, sets out what the controlled trials in horses genuinely found, explains exactly what the FEI rules permit, and gives practical guidance on when magnetic products are a reasonable thing to put on a horse and when they are not. Some of what follows will not please the people selling these products.

Static Magnets and PEMF: Two Very Different Technologies

The single biggest source of confusion for owners is that two unrelated technologies share a marketing category:

• Static magnetic therapy. Passive permanent magnets, usually neodymium or ceramic ferrite, sewn into rugs, boots, wraps and bell boots. They produce a continuous, unchanging field, typically a few hundred to a couple of thousand gauss measured at the magnet surface and very much weaker by the time it reaches any tissue of interest. There is no power source and nothing to programme.
• Pulsed electromagnetic field (PEMF) therapy. Powered devices that switch a magnetic field on and off at controlled low frequencies. Equine systems use coils driven from a battery or the mains. This is the technology with a genuine human clinical history, principally in the management of non-union fractures.

These are not interchangeable, and a rug with magnets sewn into it is not a weaker version of a PEMF machine. It is a different thing entirely. Any evidence you are shown for one tells you nothing about the other, yet retail listings routinely present both under a single heading.

How Magnetic Therapy Is Claimed to Work

Manufacturers and some rehabilitation practitioners put forward four proposed mechanisms:

1. Increased local blood flow. The field is said to influence charged ions and haemoglobin, producing vasodilation and better tissue perfusion. This is the claim you see most often on packaging.
2. Reduced pain perception. Proposed alteration of nerve cell membrane potential, dampening nociceptive signalling.
3. Accelerated bone and soft-tissue healing. Upregulation of osteoblast activity and growth factor expression, extrapolated from laboratory and human orthopaedic work.
4. Muscle relaxation. Reduced post-exercise stiffness and faster recovery between sessions.

Every one of these is testable. The useful question is not whether the mechanism is theoretically possible, but whether a field of the strength these products actually deliver, through skin, hair, fat and fascia, produces a measurable change in a living horse. Several research groups have gone and looked.

The Evidence on Static Magnets: Two Controlled Trials

The equine literature on static magnets is small, but it is not absent, and two studies stand out because both were properly controlled.

Steyn et al. 2000: Blood Flow Measured by Scintigraphy

Published in the Journal of the American Veterinary Medical Association, this remains the most direct test of the blood flow claim. Six healthy adult horses had their red blood cells radiolabelled in vivo with technetium Tc 99m, and scintigraphic images were taken. A commercially available magnetic wrap went on one metacarpus and a control wrap on the opposite leg. The wraps stayed on for 48 hours, then scintigraphy was repeated and relative perfusion ratios were calculated.

The result was unambiguous. The change in perfusion under the magnetic wrap was not significantly different from the change under the control wrap. The authors concluded that in horses, a static magnetic field from a commercially available magnetic wrap applied for 48 hours does not increase blood flow to the tissue underneath it. Forty-eight hours is far longer than any owner leaves a wrap on, and the technique was sensitive enough to detect real perfusion change. If the effect existed at a clinically useful size, this study design would have found it.

Edner et al. 2015: The Magnetic Blanket, Blinded and Placebo-Controlled

This is the study every owner buying a magnetic rug should know about, and it is the strongest piece of work in the field. Published in the Equine Veterinary Journal by a group at the Swedish University of Agricultural Sciences, it used a prospective, randomised, blinded, placebo-controlled crossover design on 10 healthy horses. Each horse received both treatments on consecutive days, so each animal was its own control.

Four outcomes were measured on the horse's back: muscle blood flow by photoplethysmography, skin temperature by thermistors alongside digital infrared thermography, mechanical nociceptive thresholds by algometry, and behaviour scored from film against an ethogram. Horses wore either a blanket with active 900 gauss magnets or one with visually identical placebo magnets, following a 30 minute baseline, for a 60 minute treatment period and a 30 minute follow-up.

Blood flow, skin temperature, nociceptive thresholds and behaviour did not differ between the active and the placebo blanket. The detail that matters most is this one: skin temperature rose during treatment, but it rose equally under both blankets. The warmth an owner feels when they lift a magnetic rug off a horse's back is real. It is simply the rug. A sheet of fabric holding body heat against the skin produces exactly the same warming whether magnets are sewn into it or not, and that warming is the observation most often cited on yards as proof that the magnets are working.

The honest summary is that static magnets have no robust evidence of a physiological effect in the horse. That is not the same as saying magnetic boots are useless objects, because a boot is also a bandage and bandages do things. It does mean that any benefit you observe cannot be attributed to the magnets.

The Evidence on PEMF: Weaker Than the Marketing Suggests

PEMF is routinely presented as the serious, clinically validated end of the category. The equine literature does not support that framing as confidently as the sales material implies, and in places it points the other way.

• Tendon healing: the largest equine trial found harm, not benefit. Watkins and colleagues (American Journal of Veterinary Research, 1985) created surgical defects in both front superficial digital flexor tendons of 20 horses, treated one limb with PEMF for two hours daily and used the other as a control. PEMF significantly delayed maturation of the repair tissue at 8 and 12 weeks. This is the single largest controlled equine tendon study of PEMF, and its finding is the opposite of the claim usually made for the technology.
• Bone healing: a small effect, described cautiously by its own authors. Kold and colleagues (Equine Veterinary Journal, 1987) studied cancellous bone graft incorporation in eight yearling ponies using tetracycline labelling. They found a small but statistically significant effect of PEMF stimulation, and then wrote that the observations "can only be considered as indicative of a possible trend". That is a fair description of the bone evidence nearly four decades on.
• Joint pain: improvement that disappears under objective measurement. A 2026 crossover study from Colorado State University (Journal of Equine Veterinary Science) treated six mares with radiographic distal tarsal osteoarthritis. A blinded vet scored the flexion-induced lameness response as improved one hour after a single PEMF treatment, and circulating IFN-gamma fell. But objective gait asymmetry, measured by inertial sensor gait analysis, did not change at all, and nothing was different at one day or one week. Subjective assessment improved; the machine measuring the horse's actual movement did not agree.
• The largest blinded trial found the placebo group did better. A 2024 study in Animals put 100 horses undergoing general anaesthesia into a randomised, investigator-blinded, placebo-controlled trial of BEMER therapy using visually identical blankets. Recovery quality was scored by a blinded surgeon on a 10 to 72 scale where lower is better. The placebo group recovered significantly better (mean 16.1) than the BEMER group (mean 22.4). One of the authors was a paid consultant to the manufacturer, which makes the direction of that result more striking, not less.

PEMF is not a fraud and the mechanism is biologically plausible. But "biologically plausible with a handful of small, mixed studies" is a very different position from "clinically proven", and it is the first of those two that the equine evidence supports.

The Systematic Review Verdict

Individual studies can be cherry-picked in either direction, which is why systematic reviews exist. In 2022 a group from the University of Helsinki, the Swedish University of Agricultural Sciences and Umeå University published a systematic review of electrotherapy in sport and companion animals in the journal Animals, following Cochrane guidelines as adapted by the Swedish Agency for Health Technology Assessment.

They searched three databases for the years 1980 to 2020 and screened 5,385 references. Forty-one articles met inclusion criteria across all electrotherapy modalities in horses, dogs and cats. Of those, 13 concerned PEMF and just 4 concerned static magnets. Half the included studies were judged to be at high risk of bias (20 high, 7 moderate, 14 low), and treatment parameters varied so widely that studies could not sensibly be compared with one another.

Their conclusion was blunt: the current scientific evidence is not sufficient to support the clinical effects of electrotherapies for any clinical indication in horses, dogs or cats. The authors did note that some suggestive results warrant further high-quality research, PEMF among them. That is where the field genuinely stands: not disproven, not established, and under-researched after forty years of commercial sale.

Why Owners Still See Results

A horse does not know it is wearing magnets, so the classic placebo response cannot apply to the animal. The effect operates on the person watching, and it is well documented across veterinary medicine. An owner who has just spent a few hundred pounds on magnetic boots is more likely to notice the horse standing square and comfortable, less likely to register a subtle change of gait, and more likely to credit the boots than the cool-down walk, the bandage support, the day off or simple time.

The 2026 Colorado State study is the cleanest illustration available. A blinded, experienced veterinary surgeon watching horses trot up genuinely scored them as sounder after PEMF. The inertial sensor system measuring the same horses at the same moment found no change whatsoever. If a blinded specialist and a machine can disagree that plainly under trial conditions, an owner watching their own horse in the yard has very little chance of separating a real effect from an expected one.

None of this is a reason to be rude about magnetic rugs. It is a reason to stop treating "my horse seemed better" as evidence of biological action, and to keep these products in the category of low-risk supportive yard practice rather than treatment. The same critique applies across most equine bodywork and complementary modalities, as our look at Bowen therapy for horses sets out in more detail.

Magnetic Therapy and the FEI Rules

This is the part most articles get vague about, so here is the specific rule. Under Article 1062 of the FEI Veterinary Regulations, both technologies appear on the list of Non-Restricted Supportive Therapies:

• Clause 1(a) covers static magnetic equipment and ionic boots, giving magnetic rugs and magnetic leg and neck wraps as the examples.
• Clause 1(b) covers low frequency PEMF machines, giving battery powered magnetic rugs and leg wraps as the examples.

Being non-restricted has real practical consequences. These therapies may be carried out by the Person Responsible, additional PRs or support personnel, on horses they are directly responsible for, and they may be carried out in the horse's stable. They are not medications and pose no anti-doping risk.

There is, however, one hard limit that owners of powered devices need to know. Clause 5 states that the use of PEMF machines is only permitted if their electromagnetic field is below 0.1 Tesla, which is 1,000 gauss. If you compete under FEI rules, check the rated output of any unit before it goes near a horse at an event. Note also that the equipment itself is subject to routine checks by the Veterinary Commission or Veterinary Delegate and by stewards, and that any therapy not on the list requires specific prior approval.

It is worth contrasting this with Article 1063, Restricted Supportive Therapies, which is where TENS machines, therapeutic ultrasound, diathermy and the physical therapies including physiotherapy, osteopathy and chiropractic all sit. In other words, the FEI applies tighter controls to the hands-on discipline with the better evidence base than it does to magnetic rugs. Regulatory permissiveness is a statement about safety and doping risk, not a verdict on efficacy, and it should never be read as one.

Static Magnets vs PEMF: A Practical Comparison

When Magnetic Therapy Is Reasonable to Try

Magnetic products are not a treatment for any veterinary condition. Used sensibly they are low risk, and there are situations where reaching for them is a perfectly defensible thing to do, provided you are honest with yourself about why:

• Post-exercise stiffness in older or hard-working horses. A rug after a competition or a hill day, in addition to a proper cool-down. Accept that the warmth is doing the work.
• Mild back tension after saddle fit has been corrected, as one part of a programme rather than the programme itself.
• Cosmetic windgalls or legs that fill overnight in stabled horses. Magnetic stable boots are commonly used here, and the compression and support from the boot is the likely mechanism.
• Travel. Magnetic travel boots protect legs in transit. That protection is mechanical and worth having on its own terms.
• Long-term management of diagnosed degenerative conditions such as arthritis and degenerative joint disease, alongside veterinary treatment, weight control and consistent low-impact movement, which is where the actual gains are.

If money is limited, spend it on the things with strong evidence first: a proper lameness workup, correct farriery, saddle fit, weight management and a structured exercise programme. Magnetic kit should be what you buy after those, not instead of them.

When Magnetic Therapy Should Not Be Used

• Acute swelling, heat or lameness without a diagnosis. This is the important one. A hot, swollen leg may be cellulitis, lymphangitis, a tendon injury or a developing fracture. Wrapping it in something warm can mask deterioration and cost you critical time. Ring your vet first. The signs that separate a lymphatic infection from ordinary filled legs are set out in our guide to recognising lymphangitis on the yard.
• Open or weeping wounds. Products with embedded metal should never sit over broken skin.
• Fever or systemic infection. A heat-retaining rug is the wrong thing to put on a febrile horse.
• Over the abdomen of in-foal mares. Manufacturers generally contraindicate this. The evidence is theoretical, but the precaution costs nothing.
• Undiagnosed lumps or suspected tumours. There is no good evidence either way, which is precisely the reason to get a diagnosis before applying anything.
• Handlers with pacemakers or implanted electronic devices. More relevant to people than horses, and worth knowing on a shared yard. The FEI has raised human safety around PEMF machines in stables specifically.
• As a substitute for veterinary attention in a horse with laminitis. Laminitis is an emergency. Nothing in this category has any role in it.

What You Will Actually Pay in the UK

Pricing observed across UK equestrian retailers in August 2026 gives a reasonable picture of the market. Static magnetic pastern wraps and stable leg wraps sit at roughly £38 to £40 a pair. Magnetic stable boots and hock boots run to about £62 to £67. Magnetic bell boots are around £49, and magnetic leg bands about £80. Full magnetic rugs cost substantially more than any single item of legwear.

Powered PEMF equipment is a different order of expense. Single limb wraps start around £330, and complete equine PEMF systems marketed for home use run into the low thousands of pounds. Practitioner-applied sessions are charged separately and vary widely by region and travel.

Set that against the alternatives. A UK equine physiotherapy session typically costs £60 to £110, and physiotherapy is the modality in this space with the better evidence base and a statutory referral framework behind it. If you are choosing between one magnetic rug and several sessions with a chartered veterinary physiotherapist, the evidence points clearly at the physiotherapist.

Using Magnetic Boots and Rugs Sensibly

If you own magnetic kit, or you have decided the low-risk supportive argument is good enough for you, use it properly:

1. Use after work, not during it. These are recovery products. Ridden exercise is not the moment for them.
2. Build up gradually. Start at 20 to 30 minutes for the first few uses, then extend to one to four hours.
3. Observe the manufacturer's maximum. Most specify no more than overnight, around 12 hours. Continuous wear is not better than periodic use, and prolonged wrapping brings its own problems.
4. Check the fit every time. Straps snug rather than tight. A rub or a pressure point over the fetlock undoes any conceivable benefit and creates a real problem.
5. Apply to clean, dry skin. Never over mud, sweat or a wound.
6. Keep looking at the leg. A boot that lives on a leg is a boot that stops you noticing what the leg is doing. Take it off, run your hand down, look properly.
7. Wash with care. Most magnetic rugs are cold machine washable and should not be tumble dried. Heat damages both the fabric and the fixings.
8. Replace when the kit wears out. The magnets themselves do not meaningfully weaken over the life of the product. The stitching, straps and linings do.

Above all, keep a clear line between supportive kit and diagnosis. If a horse is lame, the answer is a vet and a proper workup, whether that ends in a diagnosis of navicular syndrome, bone spavin or proximal suspensory desmitis. No rug substitutes for knowing what is wrong.

Frequently Asked Questions

Does magnetic therapy really work on horses?

On the current evidence, no, not in the way it is usually claimed. The two properly controlled equine trials of static magnets both came back negative: Steyn et al. (2000) found no increase in blood flow to the metacarpus after 48 hours of a magnetic wrap, and Edner et al. (2015), a blinded placebo-controlled crossover study, found no difference in muscle blood flow, skin temperature, pain threshold or behaviour between a 900 gauss magnetic blanket and a placebo one. The evidence for PEMF is mixed and mostly small-scale. A 2022 systematic review screening 5,385 references concluded that the evidence is not sufficient to support clinical effects of electrotherapies for any indication in horses.

What are the disadvantages of magnetic therapy for horses?

The products themselves are low risk when used on sound, healthy horses. The real disadvantages are cost, and more seriously the risk of delay: putting a magnetic boot on an undiagnosed hot or swollen leg can mask a deteriorating cellulitis, tendon injury or fracture. There is also one documented adverse finding in the literature, where PEMF significantly delayed tendon repair in a controlled equine study, and a 2024 blinded trial in which horses given PEMF recovered from anaesthesia less well than the placebo group.

How long can you leave a magnetic rug or sheet on a horse?

Follow the manufacturer's instructions, which typically mean starting at 20 to 30 minutes, building to one to four hours, and not exceeding around 12 hours or overnight. Longer is not better. The rug should go on a clean, dry, properly cooled horse, never over sweat or mud and never straight after hard work.

Is magnetic therapy allowed under FEI rules?

Yes. Article 1062 of the FEI Veterinary Regulations lists static magnetic equipment and low frequency PEMF machines as Non-Restricted Supportive Therapies, which may be applied by the Person Responsible or support personnel and may be used in the horse's stable. One condition applies to powered devices: PEMF machines are only permitted if their electromagnetic field is below 0.1 Tesla, equivalent to 1,000 gauss. Equipment is subject to routine checks by FEI officials. Always check the current edition of the regulations before an event.

Do magnetic boots help horses with arthritis?

There is no equine trial evidence showing that static magnets relieve arthritic pain. A 2026 study of PEMF in horses with distal tarsal osteoarthritis did find a blinded vet scored the flexion response as improved one hour after treatment, but objective inertial-sensor gait analysis of the same horses showed no change, and the effect was gone by the next day. For a horse with diagnosed degenerative joint disease, the interventions with real supporting evidence are weight control, consistent low-impact movement, appropriate veterinary medication and good farriery.

What is the difference between magnetic and ceramic therapy rugs?

Magnetic products use permanent magnets to produce a static field. Ceramic products use ceramic minerals woven into the fabric that reflect the horse's own body heat back as far infrared. They are entirely different technologies that are often sold side by side. Given that Edner et al. found the warming under a magnetic blanket was identical to the warming under a placebo blanket, the heat-retention effect common to both is the more plausible explanation for what owners observe.

References and Further Reading

• Steyn PF, Ramey DW, Kirschvink J, Uhrig J. Effect of a static magnetic field on blood flow to the metacarpus in horses. J Am Vet Med Assoc 2000;217(6):874-877. PubMed
• Edner A, Lindberg LG, Broström H, Bergh A. Does a magnetic blanket induce changes in muscular blood flow, skin temperature and muscular tension in horses? Equine Vet J 2015;47(3):302-307. PubMed
• Watkins JP, Auer JA, Morgan SJ, Gay S. Healing of surgically created defects in the equine superficial digital flexor tendon: effects of pulsing electromagnetic field therapy. Am J Vet Res 1985;46(10):2097-2103. PubMed
• Kold SE, Hickman J, Meisen F. Preliminary study of the effect of pulsed electromagnetic field treatment on the incorporation of equine cancellous bone grafts. Equine Vet J 1987;19(2):120-124. PubMed
• Hyytiäinen HK, Boström A, Asplund K, Bergh A. A systematic review of complementary and alternative veterinary medicine in sport and companion animals: electrotherapy. Animals 2022;13(1):64. Full text
• Brandenberger O, et al. Effect of BEMER horse therapy on cardiopulmonary function and recovery quality after isoflurane anaesthesia in 100 horses. Animals 2024;14(24):3654. Full text
• Wilson I, et al. Short-term effects of pulsed electromagnetic field therapy on flexion-associated lameness responses and circulating cytokines in horses with distal tarsal osteoarthritis. J Equine Vet Sci 2026;166:106106. PubMed
• FEI Veterinary Regulations, Articles 1062 and 1063 on Supportive Therapies.
• British Equine Veterinary Association and the Royal College of Veterinary Surgeons.

This article is educational and does not replace veterinary advice. If your horse is lame, swollen or unwell, contact your veterinary surgeon before applying any therapeutic product.