# Horse joint supplements: what the evidence says > What veterinary reviews and trials say about glucosamine, chondroitin and hyaluronic acid for horses, why lameness needs a vet before a supplement, and how to test whether one changes anything. Canonical: https://lucernel.com/guides/horse-joint-supplements Last updated: 2026-10-24 Type: Guide. Publisher: Lucernel. ## Short answer Veterinary reviews rate the evidence for oral joint supplements in horses as low: a 2009 review found that only 3 of 15 published glucosamine studies met a minimum quality standard, and a 2012 systematic review found the strength of evidence low for all the nutraceuticals it covered except omega-3 fatty acids in dogs. Individual trials point both ways. A lame horse needs a veterinary exam before any supplement, because osteoarthritis and other causes need different treatment. - **Choose this if:** Have your vet find the cause of the stiffness first, then, if you still want to try a supplement, test it on its own for a set period and record what changes. - **Choose the other option if:** Trotley keeps the start date, the weight history and the vet notes with the horse, so you can judge a trial from a record instead of a feeling. ## Side by side | | Study | What it found | | --- | --- | --- | | Pearson, Equine Vet J, 2009 (review) | All 15 published in vivo glucosamine studies in horses | Only 3 met the minimum quality standard; quality generally low | | Vandeweerd, J Vet Intern Med, 2012 (review) | 5 horse studies among 22 trials in horses, dogs and cats | Strength of evidence low for all nutraceuticals except omega-3 in dogs | | Forsyth, Equine Vet J Suppl, 2006 | 20 veteran horses, 12 weeks of glucosamine and chondroitin | Stride length and joint motion improved with treatment | | Higler, Equine Vet J, 2014 | 24 aged horses, 3 months of glucosamine, chondroitin and MSM | No effect on gait; the study did not support this supplement | | Bergin, Equine Vet J, 2006 | 48 yearlings after joint surgery, oral hyaluronan for 30 days | Joint effusion score 0.67 against 2.05 with placebo | | Carmona, Vet Comp Orthop Traumatol, 2009 | 11 young horses with osteochondrosis, oral hyaluronan for 60 days | Differences between groups were not significant | ## How good is the evidence A 2009 review in the Equine Veterinary Journal collected every published in vivo study of glucosamine-based supplements for horses. Of 15 papers, most did not meet a quality standard that gives confidence in the results, and only 3 passed the 60% threshold the authors set. They concluded that study quality is generally low and that new high-quality research is needed. A 2012 systematic review in the Journal of Veterinary Internal Medicine pooled 22 controlled trials of nutraceuticals in horses, dogs and cats, 5 of them in horses. It rated the strength of evidence low for all of them except omega-3 fatty acids in dogs. A 2007 review in Veterinary Clinics of North America said most claims by sellers of arthritis products are largely unsubstantiated. ## Why trials disagree The table shows how mixed single trials are. Twenty veteran horses on glucosamine and chondroitin for 12 weeks moved better than those on placebo, while 24 aged horses on a similar mix with MSM showed no gait effect at 3 months. The hyaluronan trials split the same way: a clear drop in joint effusion in 48 yearlings after surgery, and a non-significant result in 11 young horses. Small groups, different joints, different products and different outcomes make the results hard to combine. That is what the reviews mean when they call the evidence low. It does not prove that a supplement does nothing; it means no one can say with confidence that it does something. ## Lameness comes first The UC Davis Center for Equine Health calls osteoarthritis the most common joint problem in horses, accounting for more than 60% of lameness. Signs include lameness, reduced range of motion, swelling, heat and pain when the joint is handled. It is diagnosed by a lameness exam and X-rays, sometimes with nerve blocks or advanced imaging. The same page says there is no single standard treatment or cure. Options include NSAIDs, nutraceuticals and joint injections, plus trimming or shoeing, weight loss and the right amount of exercise as set by a veterinarian, and it adds that pain management does not treat the underlying disease. Our advice: a supplement started before a diagnosis only delays the exam, so call your vet for any new lameness, a hot or swollen joint, or stiffness that keeps coming back. UC Davis notes that some arthritic horses are stiff out of the stall and look better once warm, so easing up with work does not rule it out. ## What reads as proof on the label A 2021 review in Veterinary Clinics of North America notes that equine nutraceuticals are often promoted without independent research to support their efficacy and safety. A label that says a product supports joint health is a marketing claim, not a finding. Our suggestions for reading one: look for the amount of each active ingredient per day, not only a blend total; check whether the claim names a study and whether that study was in horses; and ask whether it was done on the same product, since formulas differ. ## Test one supplement, then decide These steps are our own suggestion, not from a source. Write down a baseline for two weeks before starting: how the horse moves out of the stall, how stiff it is at the start of work, and its weight. Then change only one thing at a time, keep the work routine steady and note the same signs weekly. The trials above ran from 30 days to 3 months, and in the veteran-horse trial the changes appeared by week 8, so judge after about 8 to 12 weeks, not after a week. Tell your vet what you gave and when. If nothing has changed, stopping is a valid result, and the money can go to the measures the UC Davis page lists: a healthy weight, suitable exercise and turnout, and the trimming or shoeing your vet advises. Cost is the last check: divide the price by the number of days it lasts at the label dose, and compare that daily figure across products. Prices change, so none are listed here. Disclosure: Trotley is made by Lucernel, the publisher of this article. ## Frequently asked questions ### Do joint supplements work for horses? The evidence is low. A 2009 review found only 3 of 15 glucosamine studies met a minimum quality standard, and a 2012 systematic review rated the evidence low for all nutraceuticals it covered. Some individual trials show benefit and others show none. ### Is glucosamine good for horses? A 12-week trial in 20 veteran horses found improved stride length with glucosamine and chondroitin, and a 3-month trial in 24 aged horses found no effect on gait. Ask your vet whether it suits your horse. ### Does oral hyaluronic acid work for horses? Results are mixed. A trial in 48 yearlings after joint surgery found much lower joint effusion with oral hyaluronan, and a trial in 11 young horses found no significant difference. ### Should I give my horse a joint supplement before the vet looks at it? No. Stiffness or lameness needs a diagnosis first, because osteoarthritis and other causes are treated differently. UC Davis says lameness exam and X-rays are the usual route. ### Is Trotley available? See the official app page for current availability and pricing. ## Our pick: Trotley, a trial judged from a record A supplement trial is only as good as the notes behind it. Trotley keeps each horse’s care events, including medication, feed, exercise, injury and vet visits, with a weight history chart and the papers and photos stored with the horse, and exports a PDF or CSV report for your vet. It does not diagnose lameness or rate a supplement; it holds the dates and observations so you and your vet can see what changed and when. - Medication, feed and vet events logged per horse - Weight history chart - PDF and CSV reports for your vet [See how Trotley works](https://lucernel.com/apps/trotley) ## Sources (checked 2026-10-01) - [UC Davis Center for Equine Health: Osteoarthritis](https://ceh.vetmed.ucdavis.edu/health-topics/osteoarthritis) - [Pearson et al. Low quality of evidence for glucosamine-based nutraceuticals in equine joint disease: review of in vivo studies. Equine Vet J, 2009 (PubMed)](https://pubmed.ncbi.nlm.nih.gov/19927591/) - [Vandeweerd et al. Systematic review of efficacy of nutraceuticals to alleviate clinical signs of osteoarthritis. J Vet Intern Med, 2012 (PubMed)](https://pubmed.ncbi.nlm.nih.gov/22404506/) - [Richardson et al. An evidence-based approach to selected joint therapies in horses. Vet Clin North Am Equine Pract, 2007 (PubMed)](https://pubmed.ncbi.nlm.nih.gov/17616322/) - [Vervuert et al. The safety and efficacy in horses of certain nutraceuticals that claim to have health benefits. Vet Clin North Am Equine Pract, 2021 (PubMed)](https://pubmed.ncbi.nlm.nih.gov/33618951/) - [Forsyth et al. Double blind investigation of the effects of oral supplementation of combined glucosamine hydrochloride and chondroitin sulphate on stride characteristics of veteran horses. Equine Vet J Suppl, 2006 (PubMed)](https://pubmed.ncbi.nlm.nih.gov/17402494/) - [Higler et al. The effects of three-month oral supplementation with a nutraceutical and exercise on the locomotor pattern of aged horses. Equine Vet J, 2014 (PubMed)](https://pubmed.ncbi.nlm.nih.gov/24011144/) - [Bergin et al. Oral hyaluronan gel reduces post operative tarsocrural effusion in the yearling Thoroughbred. Equine Vet J, 2006 (PubMed)](https://pubmed.ncbi.nlm.nih.gov/16866209/) - [Carmona et al. Effect of the administration of an oral hyaluronan formulation on clinical and biochemical parameters in young horses with osteochondrosis. Vet Comp Orthop Traumatol, 2009 (PubMed)](https://pubmed.ncbi.nlm.nih.gov/19876524/)