Best joint supplements, ranked.

A disclosed green-lipped-mussel-forward chew, NASC-sealed and well priced; a modest GLM dose for a larger dog keeps it Good rather than Strong.

The senior version of YuMOVE's green-lipped-mussel chew, fully disclosed with the same ActivEase GLM backbone plus added omega-3, hyaluronic acid, and vitamins C and E, from an NASC, batch-testing brand; the GLM dose is modest and its evidence is moderate rather than strong, so it lands Good not Strong, but it is fairly priced at about 0.42 a day.

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.

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.

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.

A transparent, well-priced feline joint capsule from a batch-testing owner-operator, held to Good by the contested glucosamine and chondroitin evidence base.

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.

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.

The reference-weight Dasuquin: glucosamine, chondroitin, ASU, and MSM fully disclosed and batch-tested, but the headline glucosamine and chondroitin evidence is weak; Good.

Green-lipped mussel is the better-evidenced joint active and the label discloses every amount with no blend, from an NASC brand that owns its plant, but a 22 lb dog sits at the low end of the weight-scaled schedule so its per-day green-lipped mussel lands under typical studied doses, and there is no independent testing.

The mid-stage GlycoFlex, fully disclosed with green-lipped mussel alongside glucosamine and MSM, from an NASC brand that owns its plant; green-lipped mussel is the better-evidenced joint active but the weight-scaled schedule keeps a small dog's per-day dose modest, so it lands Good rather than Strong, with no independent testing named.

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.

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.

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.

A fully disclosed green-lipped-mussel chew, NASC-sealed, but in our view the headline 41% strength claim overreaches its evidence, which pulls Evidence down to Mixed.

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.