For horses · Dec 21, 2012
Your horse’s joints need more than a supplement to stay sound
What you put on your horse’s legs, when you apply cold, and what goes in the feed bucket all matter: get one wrong and you’re quietly wearing away years of healthy movement.
Joint health is not a single fix. It needs physical support, cold therapy, and the right supplements working together. Boots help by stopping the fetlock from over-extending under load, taking pressure off the tendons. The catch is heat: skin temperature under boots and bandages climbs during exercise, so remove them when they serve no purpose. In the first 48 hours after hard work or injury, ice or cold water is your best tool. It brings down swelling and pain directly. Oral supplements including glucosamine, Boswellia serrata, and devil’s claw (Harpagophytum procumbens) have shown real, measurable improvements in horses with joint disease.
Common misconception: leg boots protect and support, so more is better
I understand why owners reach for boots by default. The marketing is compelling: sturdy construction, space-age materials, impressive price tags. More coverage feels like more protection. The research tells a more uncomfortable story, and the equine industry has been slow to acknowledge it.
Boots do offer real, measurable benefit. Studies confirm that leg boots reduce fetlock drop at its lowest point during movement, taking load off the tendons and support structures lower down the leg [3]. That’s genuine, and I won’t dismiss it. But the same research flags a problem: restrict that joint movement for too long during healing, and it gets in the way of tendon fibres knitting back together properly [3]. The very thing that looks protective can work against recovery.
Then there’s heat. Boots and bandages trap warmth during exercise, and skin temperatures under a bandage have been recorded at close to 25°C after work, notably higher than an uncovered leg at rest [4]. Heat building up in the lower leg is linked to tissue damage. Wrapping legs that don’t need wrapping adds that heat load for no gain.
Boots are a tool for specific situations: jumping, work over rough ground, tendons that are genuinely vulnerable short term. Don’t reach for them as a general precaution. Always cool the legs down after work, whether boots were worn or not [3]. And if a tendon is healing, think carefully before keeping boots on long term. They may do more harm than good.
How cold therapy, boots, and supplements act on the equine joint
Cold therapy
Most people use ice boots once, leave them on for half an hour, and consider the job done. That is not how cold works on tissue.
Cold slows the inflammatory cascade after exercise or injury. The research is clearest in the first 0-48 hours. That is the window where cryotherapy earns its place, pulling down swelling and pain. It has even been used in laminitis management. But the cooling effect from ice boots fades in roughly 14-15 minutes. If you are not reapplying, you are not reaching the tissue. The Merck Veterinary Manual lists cold water and ice as standard physical therapy for joint injuries, alongside rest and controlled movement. Not fringe. Standard.
Leg boots and bandages
Boots offer measurable support. They reduce how far the fetlock joint drops under load, which takes strain off the superficial digital flexor tendon and the suspensory apparatus. Useful. But restrict that movement for too long during healing and you interfere with how the tendon fibres knit back together.
Heat is the other problem, and it is concrete. Researchers measured skin temperatures of 24.8 °C under a bandage after exercise, and 20.6 °C under a tendon boot. Both well above resting values. That heat cannot escape while the boot is on. For an already-inflamed joint, that matters.
Oral joint supplements
**Devil’s claw (*Harpagophytum procumbens*)
Devil’s claw contains iridoid glycosides**, the compounds that drive its anti-inflammatory action. In an open-label study, horses with osteoarthritis of the hock given a herbal powder containing *Harpagophytum* alongside other plants showed improvements comparable to phenylbutazone, the standard anti-inflammatory most vets reach for first. That comparison is worth sitting with.
Boswellia serrata and collagen
A review of 26 studies found that Boswellia serrata (frankincense) and undenatured type II collagen can improve mobility, reduce lameness, and support general condition in horses. Undenatured means the collagen has not been heat-processed, so its structure is intact when it reaches the gut. Horses given these supplements before hard work showed more activity and lower inflammatory markers in the blood afterwards.
How to actually protect your horse’s legs and joints: what the evidence supports
Cold therapy: timing and application
Most people reach for cold therapy too late. It works in the first 48 hours, when the leg is actively hot, swollen, and sore [12]. That window is the one that matters. Cold water or ice brings the heat down and blunts the pain. Ice water immersion also shows real benefit for horses dealing with laminitis [12].
Cold water hosing and ice boots are both well-established methods [1]. One study measured how long the cooling effect from ice boots actually lasts: roughly 14 to 15 minutes before temperature starts climbing again [2]. Cool the legs promptly after work. Not as an afterthought once you’ve put the horse away.
Something many owners don’t realise: boots and bandages trap heat. Skin temperature under a tendon boot can reach 20.6°C after exercise. Under a bandage, 24.8°C [4]. Both are well above resting temperature. Cooling the legs straight after you remove them isn’t optional. It’s part of the job.
When to think twice about boots and bandages
Leg boots do offer a genuine physical benefit. They reduce how far the fetlock drops during movement, which takes strain off the tendons and the connective tissue supporting the joint [3]. For higher-risk work, jumping, uneven ground, fast work, that’s a reasonable trade-off.
The complication comes during injury recovery. Limit fetlock movement for too long while a tendon is healing and you interfere with the way new fibres lay themselves down [3]. That’s the opposite of what you want. Boots worn occasionally for demanding work are a different decision from boots worn constantly through a rehab programme. Keep boot use short and purposeful, not habitual.
The heat build-up problem [4] applies to all boots, regardless of cost or fit. It is not a quality issue. It’s simply what happens when you wrap a leg during exercise.
Supplements: what the evidence actually supports
Devil’s claw (*Harpagophytum procumbens*) combined with other plant-based ingredients has open-label evidence behind it. Horses with hock joint problems showed real clinical improvement, with effects described as broadly comparable to phenylbutazone [9]. That is not a controlled trial, and I won’t pretend otherwise. But it fits with what we know about the active compounds in the plant [8]. Not nothing.
One view I hold firmly: intravenous joint supplements are not the same as oral ones, and results from one should never be assumed to apply to the other. A controlled study found that horses given joint supplements intravenously as a preventive measure ended up with WORSE joint movement and worse X-ray findings than those given a placebo [6]. That’s a finding worth sitting with before anyone recommends IV treatment as routine.
Putting it all together
The clinical literature is clear: managing joint disease well means combining physical care, management changes, and appropriate supplementation [5]. The aim is to slow progression and keep the horse comfortable and functional. Cold therapy, thoughtful boot use, and well-chosen supplements aren’t competing with each other. They’re each addressing a different part of the same problem.
What we’d recommend
Devil’s claw and Boswellia serrata working together to ease joint stiffness and keep horses moving as they should.
See the product
Frequently asked questions
Do leg boots actually support a horse’s tendons?
Yes, but with caveats. Boots reduce how far the fetlock drops on impact, which takes load off the tendons and ligaments running down the back of the leg. The catch: if you restrict that movement for too long while a tendon is healing, you interfere with how the fibres knit back together. Useful short term. Not something to leave on indefinitely.
Can leg boots cause heat damage to a horse’s legs?
Yes, and the evidence is straightforward. Studies measuring temperature under boots during exercise found skin on the leg reaching over 24°C, well above what you’d see on an unbooted leg. Heat building up in soft tissue is not harmless. That is why I run a hosepipe over legs the moment we are done whenever boots have been worn, and why I do not bother with boots for routine flatwork or hacking where the risk simply is not justified.
When is cold therapy most effective for a horse’s joints?
The research points to the first 0 to 48 hours after an injury or a hard session. That is the window when cold does the most good: bringing down swelling, calming inflammation, dulling pain. Ice water immersion has also shown real benefit in laminitis cases. After that early window, cold is still worth using to cool legs after work. It just has less impact on long-standing, chronic problems.
How long does cold therapy from ice boots actually last on a horse’s leg?
Shorter than most people think. Research on commercially available equine ice boots found the cooling effect wears off in roughly 14 to 15 minutes. That does not mean cold therapy is not worth doing. It means a single boot application is not enough if you want a real therapeutic effect. A hosepipe running continuously is often more practical, and more effective, than one boot session.
Is devil’s claw effective for horse joint pain?
The case for it is credible. The active compounds in devil’s claw (*Harpagophytum procumbens*), iridoid glycosides, have shown anti-inflammatory activity in phytochemical research. An open-label study of a herbal blend containing devil’s claw in horses with hock joint disease showed results comparable to phenylbutazone. More clinical trials in horses are still needed. But the evidence is not thin.
Sources
- Joint Disorders in Horses – Horse Owners – Merck Veterinary Manual
- Thermodynamic effects of commercially available ice boots
- Influence of support boots on fetlock joint angle of the forelimb of the horse at walk and trot
- Effect of a bandage or tendon boot on skin temperature of the metacarpus at rest and after exercise in horses
- Management and Rehabilitation of Joint Disease in Sport Horses
- Management of Osteoarthritis and Joint Support Using Feed Supplements: A Scoping Review of Undenatured Type II Collagen and Boswellia serrata