Cosequin or green-lipped mussel? What is behind the best-known name on the joint shelf
Cosequin is one of the most searched joint brands. What is in the tablet, why we list it but do not rate it, and which ingredients do have an amount you can check a product against.
Ask about joint products in any dog forum and the name Cosequin turns up in the first few replies. The brand grew big in the United States. It is sold in Germany too, and whether it is worth the money can be answered from what is on the pack.
What is in Cosequin Advance
Cosequin Advance is a chewable tablet with four components: glucosamine, chondroitin, MSM and hyaluronic acid. The amount depends on weight, with twice as much for the first four to six weeks and then, for example, one tablet a day for a dog of 16 to 30 kg.
One caveat first: the shop lists the amounts in milligrams per kilogram, which for a tablet of under three grams would be almost nothing. Milligrams per tablet is almost certainly what is meant. Until we have seen it on the label itself, we enter no amounts. For the rating that changes nothing, for the reason below.
Why we list Cosequin but do not rate it
None of the three main components has a reference amount here. For glucosamine and chondroitin, the 2022 meta-analysis by Barbeau-Grégoire and colleagues found no effect in eight of nine trials and advises explicitly against continuing to recommend the combination. For MSM there is no controlled study of the amount in dogs, only mixtures whose effect cannot be pinned on any single ingredient.
A range for ingredients like these would measure whether a product is dosed like other products, not whether the amount does anything. That is why Cosequin Advance appears here under "Not rated". It is not a verdict on the tablet but a statement about what the available data can check.
Dasuquin, the sister brand with an added avocado and soy extract, is currently sold in Germany only through marketplace sellers, so we do not list it.
What does have an amount
Three ingredients on the joint shelf have a reference we can calculate against:
Green-lipped mussel has the longest trial history in the category, with several randomised placebo-controlled trials in dogs. We use 25 to 50 mg per kilogram per day, so 750 to 1500 mg for a 30 kg dog. The ingredient page also says that we could not read this range in the original paper, which sits behind a paywall.
Omega-3, counted as EPA and DHA, is the best-studied joint ingredient. The joint target comes from Bauer (2011) and is stated per kilogram of metabolic weight: 310 mg per kg to the power of 0.75. For a 30 kg dog that is about 4 g of EPA and DHA a day, or roughly 132 mg per kilogram. For an 8 kg dachshund it is about 1.5 g, but 184 mg per kilogram, because a small animal burns more per kilogram. An amount that suits the large dog is too low for the small one.
UC-II is type II collagen from chicken cartilage that has not been altered by heat. It is given as a fixed amount per dog, 40 mg a day in the trials. The trials are positive but very small; the guide to Flexadin and UC-II says how thin the basis is.
What that means for the choice
If you already give Cosequin and are happy, there is no need to rush anything. If you are choosing, omega-3 or green-lipped mussel give you something whose amount can be checked against your own dog's weight. The finder does that for every product in the comparison and shows which one reaches the reference and what it costs per day.
Supplements are not medicines. If your dog moves differently than usual, the cause belongs with a vet first, and weight is the biggest lever for every joint.