Pet supplements / active ingredient
Glucosamine and chondroitin.
This is the active most people mean when they say joint supplement, and it is the one our evidence library grades lowest of the joint group. The picture is genuinely contested rather than simply empty: an earlier randomised trial reported slow improvement, and the 2022 meta-analysis that followed found a marked non-effect and advised against it for arthritis pain. We grade the weight of that evidence, not the popularity of the ingredient.
Contested is not the same as disproven, and this is our reading of the published record rather than a verdict on any brand. Plenty of owners will keep buying it, and a vet may still suggest it. If that is where you land, the thing worth checking is the label: whether the amount per serving is disclosed at all, and whether it scales with your animal's weight.
Evidence grades are PetScored's reading of the published record under our methodology, not veterinary advice and not a claim about what will happen to your animal. If your dog or cat is stiff, sore, or slowing down, that is a conversation with your vet, not a shopping decision.
The evidence
What the published record supports, claim by claim.
Contested. An early RCT showed slow improvement, but the 2022 meta-analysis found a very marked non-effect and recommended against use for OA pain. Best-selling but weakly evidenced.
Sources: McCarthy 2007 RCT (positive, slower than carprofen); Barbeau-Gregoire 2022 meta-analysis (marked non-effect)
What the labels disclose
10 of 11 disclose a dose we can compare against the studied range.
A named ingredient is not a dose. Of the 11 products we score with Glucosamine and chondroitin as the primary active, 8 reach the amount used in the trials, 2 land part of the way there, and 1 does not disclose enough to tell. Cost of a day's serving runs $0.23 to $1.11.
On this site these products are shelved under Joint, which is worth knowing if you were browsing a different category and never saw them.
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Nutramax Dasuquin for Cats Sprinkle Capsules
A fully-disclosed glucosamine, chondroitin, and ASU joint capsule for cats at the studied forms and a weight-scaled dose; the active's osteoarthritis evidence is contested and Nutramax is not an NASC member, so it lands Good rather than Strong.
VetriScience GlycoFlex Plus for Cats
A fully disclosed, per-ingredient cat joint chew from a NASC, own-facility maker, with green-lipped mussel alongside glucosamine and chondroitin and a hedged support claim; the catch is the same as every glucosamine product, the evidence for the active is weak and contested, so it lands Good on execution rather than Strong on proof.
Nutramax Cosequin DS Plus MSM Chewable Tablets
Excellent dose transparency and in-house batch testing on a weakly-evidenced active; in our view it lands Good, not Strong, because glucosamine and chondroitin evidence for osteoarthritis is contested.
Nutramax Cosequin for Cats Sprinkle Capsules
A transparent, well-priced feline joint capsule from a batch-testing owner-operator, held to Good by the contested glucosamine and chondroitin evidence base.
Nutramax Cosequin Maximum Strength with MSM Plus Omega-3 Soft Chews
A distinct soft-chew Cosequin that discloses every active with no blend and adds omega-3, from a maker that owns its US plants with a clean recall record; the glucosamine and chondroitin evidence is weak and the long-term maintenance schedule under-doses a small dog, but at about 0.42 per day it is fair value.
Nutramax Dasuquin with MSM Soft Chews (Large Dog)
Top-tier dose transparency (adds ASU and boswellia) and batch testing, but the headline glucosamine and chondroitin evidence is weak and cost per day is mid; Good.
Nutramax Dasuquin with MSM Soft Chews (Small to Medium Dog)
The reference-weight Dasuquin: glucosamine, chondroitin, ASU, and MSM fully disclosed and batch-tested, but the headline glucosamine and chondroitin evidence is weak; Good.
Pet Naturals Hip + Joint for Dogs and Cats
A fully disclosed dog-and-cat joint chew from an NASC founding member that owns its Vermont plant, with glucosamine, chondroitin, and green-lipped mussel and a hedged support claim, and it is very cheap per day; the catch is the familiar one, the glucosamine evidence is weak and the per-serving dose is modest, so it lands Good on execution rather than Strong on proof.
Finn Hip & Joint
Fully discloses its per-active amounts from a clean-record NASC brand at a fair price, but chondroitin is a token 100 mg behind the 500 mg glucosamine and there is no independent batch testing; the glucosamine and chondroitin evidence itself is weak.
Nutramax Dasuquin Advanced Soft Chews (Large Dog)
Discloses a strong glucosamine and chondroitin dose plus ASU and omega-3 from a maker that owns its cGMP plant with a clean recall record; the glucosamine and chondroitin evidence is weak, a 140 mg botanical blend hides four secondary amounts, testing is in-house, and the vet-channel price runs high.
Zesty Paws Vet Strength Mobility Bites Hip & Joint
NASC-sealed and heavily marketed, but a proprietary blend hides the per-active doses and the cost per day is high, so it lands in Limited.
Evidence grades come from our supplements methodology. Every grade on this page is pinned to a named primary source; where the evidence is thin or contested, we say so rather than rounding it up.