Quick answer: Cosequin is the #1 vet-recommended retail joint supplement brand, and that reputation is earned — it is well-made, fully dose-disclosed, and backed by a company that funds its own research. The DS Plus MSM chewable tablet delivers 600 mg glucosamine hydrochloride, 300 mg chondroitin sulfate, and 250 mg MSM per tablet. Where it falls short is breadth: it is built around three core ingredients, while newer formulas layer in green-lipped mussel, UC-II collagen, omega-3s, and botanicals that the current science rates more highly for comfort.
This review pulls the real label numbers from Nutramax’s own store, weighs the honest evidence for each ingredient, and shows where Cosequin wins and where a broader formula makes more sense for your dog.
Disclosure: Dog Health Insider is operated by the team behind Pure Majesty Pets and may earn a commission from qualifying purchases. We only recommend products we would give our own dogs.
What Cosequin is and who makes it
Cosequin is made by Nutramax Laboratories Veterinary Sciences, a South Carolina company that has been in pet supplements for over 25 years. When surveys ask small-animal vets which retail joint supplement they recommend, Cosequin comes out on top. That is a real credential, not marketing fluff, and it is the honest starting point for any comparison. Nutramax uses branded, spec-controlled raw materials (FCHG49 glucosamine and TRH122 chondroitin) and prints every active amount on the label — something a surprising number of competitors still avoid.
Cosequin DS Plus MSM: the real label
The most popular version for dogs is the Maximum Strength (DS) Plus MSM chewable tablet. Here is exactly what each tablet contains, taken from Nutramax’s official store:
| Per chewable tablet | Amount |
|---|---|
| Glucosamine Hydrochloride (FCHG49) | 600 mg |
| Sodium Chondroitin Sulfate (TRH122) | 300 mg |
| Methylsulfonylmethane (MSM) | 250 mg |
| Manganese (as manganese ascorbate) | 3 mg |
At the official store, 60 tablets run $19.99, 132 tablets $36.99, and 250 tablets $59.99 — about $0.28 per tablet at the mid size. Full transparency on both dose and price is a genuine strength here.
Cosequin dosage for dogs
Nutramax uses a loading approach: a higher dose for the first four to six weeks, then a lower maintenance dose.
| Dog weight | Initial 4–6 weeks | After 6 weeks |
|---|---|---|
| Up to 15 lbs | ½ tablet daily | ½ every other day |
| 16–30 lbs | 1 daily | ½ daily |
| 31–60 lbs | 2 daily | 1 daily |
| Over 60 lbs | 3 daily | 1–2 daily |
For a 40-lb dog, that is roughly $0.56 a day during loading and $0.28 a day on maintenance — competitively priced for what it is.
Does Cosequin work? The honest evidence
This is where honesty matters more than brand loyalty. Glucosamine and chondroitin are the two ingredients Cosequin is built on, and the canine evidence for them is genuinely mixed. A 2022 systematic review and meta-analysis of nutraceuticals in dogs and cats with osteoarthritis found strong, consistent pain-relief signals for omega-3 fatty acids but what the authors called a “very marked non-effect” for glucosamine-chondroitin. That does not mean the pair is useless for every dog — some owners see real improvement, the safety record is excellent, and it remains a reasonable first step — but it does mean a glucosamine-and-chondroitin core is no longer the strongest formula you can buy.
By contrast, the ingredients with the best canine trial support — marine omega-3s (EPA/DHA), undenatured type II collagen (UC-II), green-lipped mussel, and boswellia — are not in standard Cosequin DS Plus MSM. That is the gap a broader formula fills.
Cosequin for dogs: side effects
Cosequin is well tolerated. The most common issues are mild and digestive — soft stool, gas, or occasional vomiting — usually resolved by giving it with food or lowering the dose. Glucosamine and chondroitin are typically sourced from shellfish, so use caution with a known shellfish sensitivity, and talk to your vet first if your dog is diabetic or on blood thinners. Serious reactions are rare. As with any supplement, watch for appetite or energy changes when you start.
How Cosequin compares to an 18-ingredient formula
Cosequin does three things and does them cleanly. Pure Majesty Pets’ Hip & Joint Chews take a wider approach, listing 18 active ingredients including the same glucosamine, chondroitin, and MSM plus green-lipped mussel, UC-II collagen, omega-3, turmeric (95% curcumin), boswellia, ginger, hyaluronic acid, eggshell membrane, and more.
| Cosequin DS Plus MSM | Pure Majesty Hip & Joint Chews | |
|---|---|---|
| Core actives | Glucosamine, chondroitin, MSM, manganese | 18 named actives (incl. all four at left) |
| Green-lipped mussel | No | Yes |
| UC-II collagen | No | Yes |
| Omega-3 / turmeric / boswellia | No | Yes |
| Per-ingredient mg on label | Yes (all four printed) | Actives named, individual mg not itemized |
| Cost per day (40–60 lb dog) | ~$0.28–$0.56 | ~$0.77 |
Two things are true at once here, and we will not pretend otherwise. Cosequin prints the milligrams for every one of its ingredients; Pure Majesty names all 18 actives but does not break out each amount on the label. If seeing an exact number beside every ingredient is what you value most, Cosequin wins that point outright. The trade-off is scope: for a modest step up in daily cost, the Pure Majesty chew covers the ingredients the current research actually rates highest — omega-3, UC-II, green-lipped mussel, boswellia — that Cosequin’s classic formula leaves out. If your dog refuses chews, a titratable liquid glucosamine is another way to dose to weight precisely.
When to see your vet
A supplement is for long-term joint support, not for a dog who is suddenly limping. Sudden or severe lameness, a leg your dog will not bear weight on, swelling, or yelping can signal a torn cruciate ligament, a fracture, or an infection — none of which a supplement fixes. Those need a hands-on exam, often X-rays, and sometimes prescription pain relief such as an NSAID (carprofen, meloxicam, grapiprant) that only a vet can provide. Never give human pain relievers like ibuprofen or acetaminophen; both are toxic to dogs. Use supplements as part of a plan that also includes weight control, traction on slippery floors, and low-impact exercise — and loop your vet in before starting, especially for a senior or a dog on other medication.
Frequently asked questions
Is Cosequin the best joint supplement for dogs?
It is the most vet-recommended and one of the most trustworthy, but “best” depends on your dog. Cosequin’s formula centers on glucosamine and chondroitin, which have mixed evidence. Formulas that add omega-3, UC-II, and green-lipped mussel line up better with the strongest current research. See our best joint supplement for dogs guide for the full ranking.
How long does Cosequin take to work?
Nutramax suggests a four-to-six-week loading period, and many owners report noticeable changes in that window. If you see nothing after about eight weeks, talk to your vet about a different approach.
Cosequin vs Dasuquin — what’s the difference?
Both are Nutramax. Dasuquin adds avocado/soybean unsaponifiables (ASU) and, in the Advanced version, boswellia and other botanicals. Our Dasuquin Advanced review breaks down whether the upgrade is worth it.
Can I give Cosequin with other supplements?
Usually yes, but avoid doubling up on the same ingredients. If you already give a broad chew, adding a separate omega-3 or collagen makes more sense than stacking two glucosamine products. Collagen in particular pairs well — see our best collagen for dogs guide.
Does Cosequin have side effects?
Mostly mild digestive upset, easily managed by giving it with food. Use caution with shellfish sensitivity and check with your vet if your dog is diabetic.
The bottom line
Cosequin deserves its reputation: clean manufacturing, full dose disclosure, and the trust of vets. If you want a proven, transparent glucosamine-chondroitin-MSM tablet at a fair price, it is a solid pick. If you want a formula that also delivers the ingredients today’s research rates highest for comfort and mobility, a broader chew such as Pure Majesty’s 18-active Hip & Joint Chews covers more ground for a little more per day. Either way, pair it with weight management and your vet’s input — our complete hip and joint guide walks through the full routine.
Sources
- Nutramax Laboratories — Cosequin for Dogs Plus MSM Chewable Tablets, official product label and pricing (store.cosequin.com), 2026.
- Barbeau-Grégoire M, et al. “A 2022 Systematic Review and Meta-Analysis of Enriched Therapeutic Diets and Nutraceuticals in Canine and Feline Osteoarthritis.” International Journal of Molecular Sciences, 2022;23(18):10384.
- Roush JK, et al. “Evaluation of the effects of dietary supplementation with fish oil omega-3 fatty acids on weight bearing in dogs with osteoarthritis.” JAVMA, 2010;236(1):67–73.
- Gupta RC, et al. “Comparative therapeutic efficacy and safety of type-II collagen (UC-II), glucosamine and chondroitin in arthritic dogs.” Journal of Animal Physiology and Animal Nutrition, 2012;96(5):770–777.
- VCA Animal Hospitals. “Glucosamine Chondroitin Combination.” Know Your Pet library.
This article is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult your veterinarian about your dog’s health and before starting any new supplement.