Last updated: October 7, 2026
Your horse seems stiff or sore, and someone at the barn suggests a joint supplement. But do horse joint supplements work, and how do you decide whether one is worth trying?
Here’s what the research says about the common ingredients, where supplements fit into arthritis care, and how to decide whether one is worth keeping in your feed program.
Table of Contents
Do Horses Need Joint Supplements?
There’s little evidence that routinely feeding a joint supplement prevents joint problems in a healthy, sound horse. Owners usually start thinking about one for an older horse that’s stiff coming out of the stall, a horse diagnosed with arthritis, a horse in hard, regular work, or one coming back from a joint injury.
In every one of those cases, the vet comes first. Stiffness and short strides can come from a hoof abscess, a soft tissue injury, or something else a supplement won’t touch. Knowing the early signs of lameness helps you catch a problem before you start guessing with feed-room products.
Do Horse Joint Supplements Work?
You can’t honestly say joint supplements work as a group. Some ingredients have better evidence than others, and just because a supplement is on the shelf doesn’t mean its ingredients have been shown to work in horses. Mississippi State Extension notes that equine studies have often produced inconsistent results, and some have weaknesses like missing placebo groups or evaluators who knew which horses got the supplement.
| Ingredient | What the horse research shows | What it means for you |
|---|---|---|
| Glucosamine | Mississippi State cites one study that found about 5% oral bioavailability, with levels too low to affect joint cells. Clinical results are inconsistent. | Don’t pay extra just because it’s the first word on the bucket. |
| Chondroitin | Usually paired with glucosamine, with mixed results. | The evidence doesn’t back big promises. |
| MSM | Little horse-specific research. | Common, but not well proven in horses. |
| Hyaluronic acid (oral) | Very limited research on the oral form. | Don’t confuse it with the injectable hyaluronic acid your vet uses. |
| ASU | Reduced joint damage in a small study, but didn’t reduce pain. | Possible joint support; pain relief wasn’t shown in this study. |
| Omega-3 fatty acids | Lowered inflammation markers in a small study of arthritic horses. | Worth watching, but not proven to fix lameness. |
Also keep feed-tub supplements separate in your mind from the FDA-approved joint drugs, like Adequan and Legend, that your vet gives by injection. Those are regulated medications, not supplements.
Are Natural Joint Supplements Better?
“Natural” doesn’t automatically mean safer or more effective. A natural ingredient still needs evidence behind it, and most have less horse research than the marketing suggests. Here’s what’s known about a few that owners ask about:
ASU. Avocado soybean unsaponifiables come from avocado and soybean oils. In a 70-day Colorado State study of 16 horses with experimentally induced arthritis, reported by The Horse, the treated horses had less joint damage and improvements in some cartilage measures, but they didn’t show less pain. That’s interesting, but it doesn’t prove ASU will make your horse move more comfortably.
Omega-3 fatty acids. In a Texas A&M study of 16 arthritic horses, 90 days of omega-3 supplementation lowered inflammatory markers in the blood and joint fluid. As Kentucky Equine Research reports, the horses also put a little more weight on their sore legs, but that change wasn’t statistically significant. The study suggests an effect on inflammation, not a clear improvement in lameness.
Herbs. Devil’s claw, yucca, and turmeric show up in a lot of natural joint products, with very little horse research behind them. Talk with your vet before using devil’s claw in a horse with ulcers or a pregnant mare. Natural doesn’t mean permitted, either. Harpagoside, a compound in devil’s claw, was added to the FEI controlled medication list in 2016. If your horse competes, check the current rules for your racing or show organization before feeding any herbal product.
Joint Supplements for Horses With Arthritis
For a horse with arthritis, a joint supplement is a small part of the plan at most. Your vet has more effective tools, including anti-inflammatory medication and joint injections. Day-to-day management matters just as much. Follow your vet’s exercise plan. When movement is appropriate, keep it regular and controlled rather than alternating days in a stall with hard work. Keeping a horse at a healthy weight also reduces the load on joints that are already compromised.
If your vet thinks a supplement is worth trying, ask what evidence supports that specific product and what improvement you should reasonably expect. The bigger gains in managing arthritis in horses usually come from the right diagnosis, treatment, and daily care.
What I’d Do With My Own Horse
When I think one of my horses has a joint issue, I have my vet check the horse first. I want to know whether there’s a problem that needs treatment before I start trying supplements. I’ve used several different joint supplements over the years, but I haven’t found one that stands out as better than the others. That’s my experience with my horses, not proof that every product works the same.
I’m going through this with my horse Electric Guitar right now. He’s been lifting a hind leg oddly and standing differently, so I had my vet examine him. My vet suspects a stifle problem and injected the joint this week. I also plan to try a joint supplement, but it’s too early to say whether the injection has helped, and I haven’t started the supplement yet.
How to Choose and Judge a Joint Supplement
Look for the NASC seal. The NASC Quality Seal means the company meets NASC’s quality control and labeling requirements and submits to random product testing by an independent lab. It doesn’t prove the supplement will help your horse.
Read the amounts, not just the ingredient list. A label that lists eight ingredients doesn’t tell you much if each one is in a tiny amount. Compare the amount per serving across brands.
Set up a fair trial. Agree with your vet on what improvement you’re looking for and when to review the results.
If you and your vet decide a joint supplement is worth trying, here are two options available on Amazon to compare. Look at the ingredients, daily amounts, and cost per day. I’m including them as shopping options, not because I’ve found either one better than the others.
About Miles Henry
Racehorse Owner & Author | 30+ Years in Thoroughbred Racing
Miles Henry (legal name: William Bradley) is a professional horseman based in Folsom, Louisiana. He holds Louisiana Racing License #67012 and has spent over three decades managing Thoroughbreds at premier tracks including Fair Grounds, Delta Downs, and Evangeline Downs.
Expertise & Hands-On Experience: Beyond the track, Miles has decades of experience in specialized equine care, covering everything from hoof health and nutrition to training protocols for Quarter Horses, Friesians, and Paints. Every guide on Horse Racing Sense is rooted in this “boots-on-the-ground” perspective.
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