Nutramax Cosequin DS Plus MSM Joint Supplement

DS Plus MSM versus the plain versions — what actually differs

Comparing it with Dasuquin, which adds avocado/soybean unsaponifiables? See our Cosequin vs Dasuquin comparison, which also covers the cat versions and side effects.

Nutramax sells several Cosequin variants, and the naming is confusing enough that people buy the wrong one. The differences that matter:

DS means double strength, not a different ingredient. Choosing between DS and Maximum Strength is about the dose per tablet and how many tablets your dog needs, not about a better or worse formula. Dose by your dog's weight using the packaging, and if you are moving between versions, recalculate rather than assuming one tablet equals one tablet.

What MSM adds, honestly

MSM is an organosulfur compound included in joint formulas on the basis of possible anti-inflammatory and antioxidant effects.

The evidence in dogs is thin. There are small human studies in osteoarthritis suggesting modest symptom improvement, and much less veterinary data. It is generally considered safe and well tolerated.

So MSM is a reasonable addition rather than a proven upgrade. If your dog is already on a plain glucosamine and chondroitin product and doing well, there is no strong reason to switch. If you are choosing fresh, the MSM version costs little more and the safety profile is good.

The underlying evidence question

This applies to the whole category, not this brand.

Studies of oral glucosamine and chondroitin in dogs have produced mixed results — some showing modest improvements in comfort and mobility scores, others showing little separation from placebo. Systematic reviews have generally concluded the evidence is weak and inconsistent, with limited study quality. The human literature is similarly unsettled.

Against that, safety is good, side effects are uncommon and usually mild, and vets often suggest these products as a low-risk part of managing arthritis.

Plausible, low risk, possibly helpful, not proven. Anyone more certain than that in either direction is overstating the evidence.

Supplements are not regulated like medicines

In most jurisdictions joint supplements are regulated as supplements rather than licensed veterinary medicines, so they do not go through a drug approval process, and independent testing has repeatedly found products whose content does not match the label.

That makes manufacturer quality control matter more here than in a regulated category, and it is the strongest argument for a long-established brand sold through veterinary channels over an unknown one. Buying from a legitimate retailer rather than a marketplace where counterfeits circulate is a sensible precaution.

Large tablets, and how to get them into a dog

The listed drawback is real — these are chunky tablets and some dogs refuse them.

What works:

If your dog reliably spits it out, a soft-chew joint product may be worth more than a theoretically better tablet the dog will not eat.

Run a proper trial, and write down your measures

Four to six weeks at the loading dose before judging. These are not painkillers and nothing happens on day one.

Before you start, write down specifics:

Written measures beat memory, because after six weeks and a real expense you will unconsciously want it to have worked.

What has better evidence than any supplement

If your dog has arthritis, these do more:

Safety notes

Tell your vet about any supplement your dog takes, particularly before surgery — chondroitin is structurally related to heparin and there has been discussion of theoretical clotting effects. Never substitute a human product without checking; human formulations can contain xylitol, which is toxic to dogs. Discuss diabetic dogs with your vet.

This page describes the product. It is not veterinary advice and does not replace a diagnosis.

Who should look elsewhere

If your dog is visibly painful, see a vet — effective pain relief exists and a supplement is not it. If your dog is overweight, weight loss is the intervention with the best evidence. And if six weeks of a proper trial changes nothing on your written measures, stop and redirect the money to a veterinary pain plan or hydrotherapy.