Antinol
Antinol Plus Mobility Hip & Joint Supplement for Dogs (Soft Gels)
$50–$161 (direct us.antinolplus.com 60 ct $49.95 / 90 ct $74.95 / 120 ct $98.95 / 150 ct $124.95 / 180 ct $147.95, verified 2026-08-27; Amazon 60 ct $55.00 / 90 ct $85.78 / 150 ct $135.99 / 180 ct $160.32, last verifiable 2026-08-16)
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Best for
A dog with diagnosed hip osteoarthritis whose owner has already run a glucosamine chew for six measured weeks and wants the one active with blinded force-plate evidence behind it
The only product in this aisle where the thing on the shelf and the thing in the trials are demonstrably the same compound — and it costs about six times what the glucosamine chews do. Buy it if your dog has diagnosed hip osteoarthritis, you have already run a glucosamine product for six measured weeks and got nothing, and roughly $1,200–$1,320 a year is money you can carry indefinitely — buy direct at us.antinolplus.com, which opened by late August 2026 and undercuts Amazon at every count. Do not buy it expecting the evidence to be settled: both trials were paid for by the company that owns the ingredient, both came from one research group, and nobody has replicated them independently. And check the weight math before you order, because above 45 lb the label stops scaling while your dog does not.
What works
- The active is EAB-277 — the exact compound that beat placebo and matched an NSAID on a force plate in two blinded, placebo-controlled canine trials. The product's own facts panel names it, under US patent 11654163, so this is the rare supplement where the shelf item and the tested item are the same thing.
- In the larger trial (101 dogs, 2024), 69% of dogs on EAB-277 were measured responders at six weeks against 8% on placebo — an individual-dog number almost no supplement in this category can produce.
- Objective endpoint. Both trials measured peak vertical force on a force plate rather than asking owners, which matters because owners scoring their own dogs in this exact setting produce a 39.7% placebo response rate.
- An oil-filled soft gel, not a flavoured chew. Calories are not published, but the whole fill is 150 mg — four of them is under a gram — against the 2.5–7.5 g molasses-and-glycerin chews that dominate this aisle.
- NASC Quality Seal member (Pet HealthWorks)
What doesn't
- Cost is the headline and it is brutal. At the label's own dose a 70 lb dog takes four soft gels a day — about $3.33 daily and roughly $1,216 a year even at the cheaper direct 150-count price ($124.95, 2026-08-27), and about $1,320 at Amazon's last-verified price. Either way it is five to six times Dasuquin with MSM's $207.
- The dose is weight-blind above 45 lb. Every dog over about 44 lb gets the same four soft gels, so a 120 lb dog receives roughly 3.7 mg/kg against the 5 mg/kg of the 2023 trial and the 10 mg/kg of the 2024 one. The bigger your dog, the further below the tested dose the label puts him.
- Both supporting trials were funded by Pharmalink International Limited, which owns the EAB-277 trademark, and both came from the same research group. No independent replication has been published.
- The study-count claim is cited nowhere and now contradicts itself on the brand's own domain. As of 2026-08-27: "four double-blind, placebo-controlled clinical studies" on Amazon, "4 double-blind clinical studies" on the US store's homepage, "2 double-blind, controlled clinical trials" on the same store's own product pages, "over 40 peer-reviewed studies" on pethealthworks.com, and "10+" on the Singapore site. The only reference page we could find lists 13 entries that resolve to 12 distinct papers (one listed twice), all on the older PCSO-524 extract; neither Kampa trial of EAB-277 itself is on the brand's own list.
- The US facts panel publishes only a 50 mg blend total. The 30 mg mussel / 20 mg krill split is published by the brand in New Zealand and Australia but not to American buyers.
- The new direct store's 30-day money-back guarantee (live 2026-08-27) is narrower than the phrase suggests: new direct customers only, capped at four bottles of the 60 or 90 count only — the 150 and 180 counts a big dog actually needs are outside it — refunded minus shipping and handling, with return postage on you.
- On Amazon the price ladder runs backwards: the 90-count is the worst value ($0.953 a soft gel) and the 180 among the best ($0.891), per the prices last verifiable 2026-08-16. The direct store that opened by 2026-08-27 prices nearly flat ($0.82–$0.83 a soft gel at every count) and undercuts Amazon's last-known price at all five counts.
Specifications
- Materials
- Per soft gel (150 mg fill): Antinol+ proprietary blend 50 mg — EAB-277 (green-lipped mussel, Perna canaliculus, oil plus krill, Euphausia superba, oil). Inactive: d-alpha tocopherol, gelatin, glycerin, olive oil, purified water, sorbitol solution.
- Sizes
- 60 soft gels (brand suggests dogs under 45 lb) · 90 soft gels (brand suggests dogs under 45 lb) · 120 soft gels (third-party seller only, 2026-08-16) · 150 soft gels (brand suggests dogs over 45 lb) · 180 soft gels (added to the line by 2026-08-16; the listing's own dosing bullet names it)
- Warranty
- 30-day money-back guarantee on direct orders from us.antinolplus.com, first published when the store opened (read 2026-08-27): new direct customers only, US/Canada consumers, capped at four bottles of the 60 or 90 count only, refund is the purchase price less shipping and handling, and you pay return postage to Pet HealthWorks in Fort Lauderdale. The 150 and 180 counts are not named by the guarantee. An Amazon purchase falls under Amazon's own return process instead.
What is actually in this soft gel, and why the name matters
Most joint supplements are argued about at the level of the brand. This one has to be argued about at the level of the molecule, because the whole case for it rests on a compound code rather than a marketing name.
| Per soft gel (150 mg fill) | Amount |
|---|---|
| Antinol+ proprietary blend (EAB-277) | 50 mg |
| — green-lipped mussel (Perna canaliculus) oil | 30 mg* |
| — krill (Euphausia superba) oil | 20 mg* |
| Inactives | d-alpha tocopherol, gelatin, glycerin, olive oil, purified water, sorbitol solution |
*The 30/20 split is published by the brand's New Zealand and Australian sites. The US facts panel gives only the 50 mg blend total. Verified 13 August 2026.
EAB-277 is the compound tested in both of the force-plate trials that made green-lipped mussel interesting in the first place, and it is protected by US patent 11654163 — a number printed on the product's own facts panel. That is unusual and it is the entire reason this product earns a place on this site: for once, the thing in the tub and the thing in the trial are the same thing.
It is worth being precise about what this is not. It is not green-lipped mussel powder. The dried whole-mussel powders in the shelf chews — YuMOVE's ActivEase, GlycoFlex's GlycOmega, and the rest — are a different substance delivered at a different scale, and no trial has shown they do what this does. That distinction is the subject of our full comparison in green-lipped mussel vs glucosamine.
Sizing: the label stops scaling before your dog does
This is the fine print that decides whether you are buying the tested dose or a fraction of it, and it is one line on the back of the tub.
The US label gives two soft gels a day up to 44 lb and four a day at 45 lb and over — and the listing copy has now split that into phases: as of 16 August 2026 it reads an initial four weeks at 4 soft gels daily for 45+ lb, then "2-4 soft gels daily" as maintenance, while the maker's own New Zealand page says two weeks of loading and then 2 daily. Three disagreements in one dosing scheme (four weeks vs two; "2-4" vs 2; a 45 lb line vs a 22 kg line) — and the cheap reading is sub-therapeutic: at 2 soft gels a day a 70 lb dog gets about 3.1 mg/kg against the 5 and 10 mg/kg the trials dosed, and a 120 lb dog gets 1.8. There is still no further band above 45 lb, so whichever reading you take, the mg-per-kg falls as the dog grows.
| Dog | Soft gels/day at the US label | EAB-277 per kg |
|---|---|---|
| 45 lb (20 kg) | 4 | ≈9.8 mg/kg |
| 70 lb (32 kg) | 4 | ≈6.3 mg/kg |
| 100 lb (45 kg) | 4 | ≈4.4 mg/kg |
| 120 lb (54 kg) | 4 | ≈3.7 mg/kg |
| 2023 trial dose | 1 capsule per 10 kg once daily | 5 mg/kg |
| 2024 trial dose | 1 capsule per 10 kg twice daily | 10 mg/kg |
Read the bottom two rows against the top four. A 45 lb dog on this label is close to the 2024 trial's dose. A 70 lb dog is between the two trials. A 120 lb dog is below both of them. Nothing about that is hidden — it is simply what a flat dose does once the dogs get big, and no competitor page states it.
The practical consequence: if your dog is large and six weeks produce nothing, "it did not work" is not the only available conclusion. "He was on two-thirds of the dose the trial used" is the other one, and it is a reasonable thing to raise with your vet before you abandon the product or double it on your own. Do not double it on your own — at four soft gels a day this already costs $1,320 a year, and the trials that ran the higher dose ran it for six weeks, not indefinitely.
What we could not verify
- The study-count claim. It has never been cited to named studies, and as of 27 August 2026 it disagrees with itself on the brand's own domain: the Amazon listing says "four double-blind, placebo-controlled clinical studies," the US store's homepage says "4 double-blind clinical studies," the same store's product pages say "2 double-blind, controlled clinical trials," pethealthworks.com says "over 40 peer-reviewed studies," and the Singapore site says "10+." The one dedicated reference page we found lists 13 entries resolving to 12 distinct papers, all on the older PCSO-524 extract — neither Kampa trial of EAB-277 itself is on the brand's own list.
- Country of manufacture. Not published on the US panel or listing.
Two items formerly on this list were resolved when the US direct store opened (read 27 August 2026): direct pricing now exists and undercuts Amazon at every count, and a 30-day money-back guarantee is now published, with the narrow terms quoted in the warranty field above. EAB-277 also now appears in page text on a US property — the store's ingredient-panel page — rather than only in label artwork, which had been our standing finding since 13 August.
Who should not buy it
- Anyone whose dog has not had six honest weeks on something cheaper. A glucosamine chew costs a sixth of this. Its best trials are less impressive, but "less impressive" is not "nothing," and $1,100 a year is the difference.
- Anyone whose dog is overweight. Weight is the largest modifiable factor in canine arthritis and the intervention with the least controversy behind it. Ask for a body condition score at the next appointment before you start a $1,320-a-year supplement.
- A dog in visible pain right now. Both trials used an NSAID as the comparator arm, and in both trials the NSAID worked. That is a conversation with your vet about analgesia, and it should not wait six weeks for a supplement trial to read out.
- Anyone who cannot sustain the cost indefinitely. Six weeks of benefit followed by stopping on cost grounds is the worst outcome available here — you pay for the trial and keep none of the result.
Frequently asked
- Is Antinol Plus the same thing as Antinol Rapid?
- Yes, as far as the published labels go. The active in both is EAB-277, a blend of New Zealand green-lipped mussel oil and Antarctic krill oil owned by Pharmalink International Limited. Antinol Plus is the name used in the United States, where Pet HealthWorks is the licensed distributor; Antinol Rapid was the earlier name and still appears in page titles and customer reviews on the brand's Australian site. The original Antinol, a different and older product, uses PCSO-524 — green-lipped mussel oil without krill. Worth knowing because the 2023 trial tested both PCSO-524 and EAB-277 and both beat placebo, while the 2024 trial tested only EAB-277.
- How many Antinol Plus soft gels does my dog need, and what does it cost per day?
- The US label says two soft gels daily up to 44 lb and four soft gels daily at 45 lb and over during the initial four weeks, with no further step up by weight; the maintenance line then reads "2-4 soft gels daily" for 45+ lb. The cheapest route changed in late August 2026: the brand's US direct store opened at us.antinolplus.com, pricing all five counts at a nearly flat $0.82–$0.83 per soft gel (150 ct $124.95, 180 ct $147.95, read 27 August 2026), below Amazon's last-verified prices at every count. A 70 lb dog on four a day costs about $3.33 daily and roughly $1,216 a year at the direct 150-count price, and a 180-count tub lasts 45 days. On Amazon, avoid the 90-count, which was the most expensive per soft gel of the five when we last could verify its prices (16 August 2026).
- Does Antinol Plus really work as well as an NSAID?
- In two blinded trials measuring dogs on a force plate, the changes in limb loading for EAB-277 and for the NSAID arm were both significantly greater than placebo and were not separated from each other. In the 2024 trial of 101 dogs, 69% of dogs on EAB-277 were responders at six weeks against 79% on meloxicam and 8% on placebo. Two honest limits: neither trial was designed as a formal non-inferiority test, so "matched" means both beat placebo rather than proof of equivalence; and both trials were funded by the company that owns EAB-277 and came from the same research group, with no independent replication published. This is not a substitute for prescribed pain relief, and that decision belongs with your vet.
- Is Antinol Plus safe for a dog with a shellfish allergy?
- Ask your vet before you start. The active is an oil extracted from green-lipped mussel and krill, both shellfish, so a dog with a documented shellfish reaction should not be started on it without veterinary advice. Note that this is a different exposure from the glucosamine chews, which are typically shrimp and crab derived. In the two published trials hematology and blood chemistry stayed within normal limits and no unexpected adverse events were reported over six weeks, but those trials excluded dogs with systemic disease and ran for six weeks only.
- Can I give Antinol Plus and Dasuquin together?
- That is a question for your vet, not for us, and there is no trial that tested the combination — every trial we can cite gave one product at a time. What we would say about the money: at roughly $1,320 and $207 a year the two together approach $1,500 annually, and running both at once makes it impossible to learn which one, if either, is doing anything for your dog. If you are going to spend at that level, run one product for six measured weeks against a score you took before you started, then decide.
Where we recommend it
The articles this product earns a place in, and the context it earns it for.
supplements
Antinol vs Dasuquin: Is the Best-Evidenced Joint Supplement Worth Six Times the Price?
These two were arms of the same blinded force-plate trial: Antinol's compound beat placebo, Dasuquin didn't. A 70 lb dog costs $1,300/yr against $207 — and the label's own dose undercuts the trial. Aug 2026.
supplements
Green-Lipped Mussel vs Glucosamine: What the Force-Plate Trials Actually Found
Two blinded trials weighed dogs on a force plate instead of asking their owners. A mussel lipid extract matched an NSAID; glucosamine and chondroitin did not beat placebo. What that does and does not mean.