MSM (Methylsulfonylmethane) is a natural supplement commonly used to support joint health, connective tissue strength, and post-exercise care in horses. It supplies key building blocks for collagen and glucosamine production, aiding in the maintenance of healthy cartilage, tendons, and ligaments.
Helps maintain healthy joint function and comfort
Protects against oxidative stress after intense exercise
Supports mobility in aging and performance horses
Affordable and easy to add to any feeding program
She is not nearly as stiff as she would’ve been without the MSM! I have seen a big difference and would definitely recommend Mad Barn supplements!
Julia Anthony
Verified Customer
MSM helps with joint health and recovery. We are very satisfied with all of your products. Highly recommend.
Nichole Berkebile
Verified Customer
I started using the MSM for my horses joints and have been seeing a difference and it’s not hard on his stomach which I love. I will continue to use Mad Barn and highly recommend there products are amazing!
Katelynn macquarrie
Verified Customer
My daughters mare is 21 and when we first got her over a year ago she was stiff in the hind end and a bit underweight. A year later and with the help of MSM from MadBarn she is so much better.
Holly Lacroix
Verified Customer
Started my 15year old mare on MSM more as a preventative measure. She eats the MadBard MSM no problem and I appreciate that it is affordable.
Gretchen Corey
Verified Customer
I had great help, support and suggestions almost immediately after emailing. Chevy seems to have made a great turnaround! I will remain a loyal customer!
Taryn Mosker
Verified Customer
Great quality and very finely ground for incorporating into feed easily.... Overall, highly recommend this MSM and I’ll continue to use it.
Isabel Dempsey
Verified Customer
I’ve been giving her MSM for 1 week and look at the difference ! There is no more bump and she is 90% more comfortable.
Laurie-Anne
Verified Customer
Annabelle has been the happiest & healthiest she’s ever been while on Mad Barn’s MSM and W-3 Oil products!
Emilie Thiffeault
Verified Customer
I’ve been using MSM and Spirulina for four years now and just started using the amino acid. I swear by these products my barrel horse tore his suspensory ligament and made a full recovery!
Kate
Verified Customer
I love giving him his MSM to support his joints and help him feel his best... Overall, these products are amazing. He doesn’t mind the taste at all and looks forward to his meals!
Emma
Verified Customer
I have a riding school in Mount Albert and with so many different riders, my horses work so hard. We started them on MSM and it has made a huge difference for their recovery after riding.
Amanda Forbes
Verified Customer
It’s a good product—easy to measure, mix into her feed, and palatable for her. Since starting MSM, Daisy has shown noticeable improvement in her comfort and mobility.
Sarah Bennacer Langlois
Verified Customer
I am very happy with this product. My horse stretches more easily and what little stiffness he had seems to have been alleviated. Plus, it is very palatable...
Pamela Rustige
Verified Customer
Started trying it over the summer on some of our senior horses and saw a great improvement in their mood and movement. It is a daily for our arthritic and younger horses...
Sarah Chomey
Verified Customer
I’m beyond happy with the product! I’ve seen positive changes in my horses’ comfortability and he is less not as stiff in the beginning of our ride.
Meghan MacDonald
Verified Customer
This product keeps my aged barrel horse moving with less pain. Shipping was fast and price is very reasonable for the outstanding product and customer service that is provided.
Tammy Herman
Verified Customer
We stand behind our products to provide the best nutrition for your horse. No fillers, just research-backed ingredients. If your horse doesn't love this product, our Customer Happiness team is here to help or give you a refund guaranteed.
Methylsulfonylmethane (MSM)
Methylsulfonylmethane (MSM) is an organic sulfur compound that provides a bioavailable source of dietary sulfur for horses. Sulfur is a structural component of amino acids, collagen, and connective tissue proteins that form cartilage, tendons, ligaments, and skin.
MSM supports normal joint metabolism and connective tissue integrity by contributing to collagen cross-linking and sulfur-based enzymatic reactions. It also helps maintain the body’s natural antioxidant capacity by supporting glutathione synthesis and other redox pathways that protect cells during exercise and recovery.
Supplementation with MSM may help maintain normal muscle and joint function in performance horses or those undergoing intensive training. It is well tolerated, widely studied, and easily incorporated into equine diets as a source of organic sulfur.
Consult with a nutritionist or veterinarian prior to use.
Top dress once daily on feed or ration.
Body Weight
Scoops
Dose
< 200 kg
¾ scoop
5 g
200 – 500 kg
1 ½ scoops
10 g
> 500 kg
3 scoops
20 g
1 scoop = 9 cc = 7 grams
Body Weight
Scoops
Dose
< 440 lb
¾ scoop
5 g
440 – 1100 lb
1 ½ scoops
10 g
> 1100 lb
3 scoops
20 g
1 scoop = 9 cc = 7 grams
Warning / Caution:
A scale should be used with all individual ingredients to ensure accurate dosing.
For equine use only. Not for use in horses intended for food. Keep out of reach of children.
Active Ingredients: Per gram serving
Ingredient
Per 10 g
MSM
10
g
Recommended Use: Supports joint health, connective tissue and post-exercise care.
Register & manufactured by: Mad Barn Inc., Petersburg, ON, Canada.
Disclaimer: These statements have not been evaluated by Health Canada or the FDA. This product is not intended to diagnose, treat, cure or prevent any disease.
1 kg (2.2 lb): SKU 628055182061 5 kg (11 lb): SKU 628055182078
Cost Calculator
Metric (kg)
Imperial (lb)
kg
grams
* Recommended serving size of 2 grams per 100 kg (220 lb) of body weight
Servings
Cost Per Day
Disclaimer: Recommended feeding rate varies depending on your horse's condition and current diet. Consult with a nutritionist to determine the appropriate inclusion rate for your horse.
Frequently Asked Questions
MSM (methylsulfonylmethane) is a naturally occurring sulfur compound used in horses to support joint health, connective tissue, skin, coat, and hoof quality. It is a source of the essential mineral sulfur, which is required for collagen and keratin production. MSM is also valued for its antioxidant properties, helping to protect cells from oxidative stress and support overall wellness in performance, senior, and recreational horses.
Horses that may benefit most from MSM include performance horses in regular training, seniors needing extra joint and connective tissue support, and horses with hoof or coat quality concerns. Horses exposed to high levels of oxidative stress, such as those in competition or recovery, may also benefit from additional antioxidant support provided by MSM. It is widely used as part of a joint health program or for maintaining healthy skin, hair, and hooves.
MSM supplies organic sulfur, an essential component of collagen, cartilage, tendons, ligaments, and other connective tissues. By supporting the structure of these tissues, MSM helps maintain normal joint function and mobility. Its antioxidant activity also helps protect joint cells from oxidative stress, which can contribute to long-term joint health when combined with proper nutrition and management.
Some horses may show changes in comfort, mobility, or coat quality within 2–3 weeks of consistent supplementation. In other cases, noticeable improvements may take several weeks to months. As with all supplements, the time frame depends on the horse’s condition, workload, and overall diet. MSM works best when used daily as part of a balanced nutrition program.
Yes. MSM can be safely combined with Visceral+, Optimum Probiotic, and other digestive support products. It may complement a gut health program by supporting antioxidant status and overall wellness.
MSM works best when fed as part of a balanced diet that provides all essential vitamins, minerals, and amino acids required for tissue repair and overall health. To further support joint health, many horse owners also combine MSM with Mad Barn’s W-3 Oil, a natural source of the omega-3 fatty acid DHA, which helps maintain normal inflammatory responses. In addition, joint supplements such as hyaluronic acid are safe to use with MSM to support cartilage and joint function. For personalized recommendations, consult with a veterinarian or equine nutritionist.
Yes. Every batch of Mad Barn MSM is tested in Canada for purity, including screening for heavy metals and contaminants, to ensure safety and quality.
Mad Barn’s MSM powder is 100% pure with no fillers or additives. Each 10 g serving provides 10,000 mg of MSM.
For a 500 kg (1,100 lb) horse, MSM is typically fed at 10 g per day (about 1.5 scoops). Horses in heavy work or those needing additional joint and mobility support may be fed higher amounts under the guidance of a nutritionist or veterinarian. MSM should always be fed as part of a balanced diet that meets your horse’s overall nutrient requirements for best results.
Yes. Mad Barn’s MSM powder comes with a scoop that holds approximately 9 cc of powder, equal to just under 2 teaspoons (about 7 g by weight). A typical 500 kg (1,100 lb) horse will receive 10 g per day, which equals about 1.5 scoops. Smaller horses or ponies may require less (around ¾ scoop), while larger horses or those in heavy work may receive up to 3 scoops daily. For the most accurate dosing, we recommend using a gram scale to measure the powder.
Mad Barn’s MSM supplement has a shelf life of 2 years when stored in a cool, dry place with the container tightly sealed.
MSM is generally considered very safe and well tolerated in horses. Adverse effects are rare, even at higher intakes. In some cases, excessive amounts may cause mild digestive upset such as loose manure. To avoid this, start at the recommended feeding rate and introduce gradually. Always feed MSM as part of a balanced diet, and consult a veterinarian if your horse is on prescription medication or has specific health concerns.
Yes. MSM is considered safe for use in pregnant and lactating mares and is well tolerated when fed at recommended levels.
Yes. MSM can be fed to weanlings, yearlings, and growing horses as part of a balanced diet. Consult with a nutritionist for feeding recommendations.
Yes. MSM is safe for horses with Cushing’s (PPID), insulin resistance (IR), laminitis, and other metabolic conditions. It can also be used alongside prescribed medications such as Prascend® (pergolide).
Yes. MSM is safe for horses with ulcers and is well tolerated. It can be fed alongside gut health supplements such as Visceral+ and Optimum Probiotic or prescribed ulcer treatments.
Yes. MSM is competition-legal and contains no prohibited substances based on current FEI guidelines, making it safe for performance horses. Regulations may change, so always confirm with your governing organization.
Yes. MSM is generally safe to use with most equine medications and is widely fed to horses on long-term therapy. Consult your veterinarian before starting any new supplement if your horse is receiving prescription drugs.
Ask A Question
Have a question about this product? Ask below and our nutritionists will be happy to assist.
“Adding MSM to your horse’s balanced diet can help maintain healthy cartilage and connective tissue during exercise and competition. It’s a cost-effective way to support joint health for all horses.”
Mad Barn’s bulk MSM powder is recommended to support healthy joints, tendons, and ligaments in your horse. It is commonly used to improve comfort and mobility in aging horses as well as performance horses.
MSM (Methylsulfonylmethane) is a natural compound that contains sulfur in a highly bioavailable form. Sulfur is an important component of glucosamine and collagen, helping to maintain healthy connective tissue and cartilage in your horse.
Research also shows that MSM has antioxidant properties and can support post-exercise care following heavy work. In one study of performance horses, it was shown to reduce biomarkers of oxidative stress following intense exercise. [1]
Your horse’s diet may naturally provide small amounts of MSM because this compound is found in fresh forage and grains. However, the amounts that are naturally present in feed are generally too low to provide meaningful benefits, making supplementation necessary.
For additional joint support, feed MSM with our w-3 Oil, which contains high levels of the omega-3 fatty acid DHA, as well as natural Vitamin E. Combining MSM with w-3 Oil support normal homeostatic regulation of inflammatory processes.
You should always consult a qualified nutritionist before altering your feed program. Submit your horse’s diet for analysis online and one of our equine nutritionists will be happy to provide a complementary review.
English
MSM 
Joint Health
Connective Tissue
Athletic Performance
Post-Exercise Care
Antioxidant Defenses
Soundness and Mobility
Senior Horses
Competition Readiness
Animal Comfort
Overall Well-Being
