The Benefits of Joint Supplements
for Dogs

Walk into any pet shop and you'll find an entire wall dedicated to joint supplements. Tablets, soft chews, powders, oils — all promising your dog a new lease of life. The market is enormous, the claims are bold, and the evidence is considerably more nuanced than the packaging suggests.

Here's an honest look at what joint supplements can and can't do for your dog.

Odin, resting between meals. A 13.6kg bag of food doubles as a pillow when you're a Great Dane. Joint support is not optional at this size.

The Honest Picture on Glucosamine and Chondroitin

These are the two most common ingredients in dog joint supplements. They're structural components of cartilage, and the theory is that supplementing them supports cartilage health and reduces joint degradation.

The evidence is genuinely mixed. A 2024 review published in the Journal of Small Animal Practice found insufficient evidence that glucosamine hydrochloride and chondroitin sulphate provided beneficial effects in treating canine osteoarthritis.¹ However, a 2023 peer-reviewed clinical trial from Khon Kaen University found dogs treated with glucosamine-chondroitin showed statistically significant improvements in pain scores and weight-bearing by day 70 — though these were slower than carprofen (a prescription NSAID).²

Where the Evidence Is Stronger — Green-Lipped Mussel

Green-lipped mussel (Perna canaliculus) is a New Zealand shellfish that contains a unique combination of omega-3 fatty acids and glycosaminoglycans not found in other sources. A study published in the Journal of Nutrition found increased plasma omega-3 concentrations and improved peak vertical force in dogs fed a diet enriched with green-lipped mussel.³

Omega-3 Fatty Acids — The Best-Evidenced Option

Omega-3 fatty acids — specifically EPA and DHA from fish oil — have the strongest evidence base of any supplement in canine joint care. They work by directly targeting inflammation via the COX and LOX pathways, reducing swelling and joint discomfort.⁴

The American Animal Hospital Association (AAHA) recommends EPA and DHA as a first-tier option for joint support. Regular supplementation supports joint mobility and alleviates symptoms associated with occasional stiffness — and unlike glucosamine, the anti-inflammatory mechanism is well-understood.⁴

A 2025 Development — Curcumin + Glucosamine

A 2025 study published in Veterinary Sciences (Huazhong Agricultural University) found that combining glucosamine-chondroitin with Curcumin C3 Complex significantly decreased pain scores, MMP-3 levels and TNF-α (inflammation markers) in dogs with osteoarthritis — offering greater bone and cartilage protection than glucosamine-chondroitin alone.⁵ Several products on our list include turmeric (curcumin source) alongside the standard stack, which may be meaningful.

What Supplements Can't Do

• They cannot reverse established osteoarthritis or repair damaged cartilage
• They are not replacements for veterinary-prescribed NSAIDs or pain management
• They cannot replace an appropriate body weight — reducing load on joints is more effective than any supplement
• They will not produce results overnight. Omega-3s take approximately 2 months to incorporate into cell membranes before clinical effects should be expected⁴