Pain when cold, limping upon waking, difficulty climbing stairs...These signs are unmistakable: many dogs suffer from joint problems, sometimes well into their senior years. Faced with this reality, many owners are turning to dietary supplements to support mobility and joint comfort. But not all active ingredients on the market have the same level of evidence or the same degree of effectiveness.
In this article, we take stock, based on recent veterinary scientific literature, to understand which active ingredients are actually supported by clinical data in dogs, and which still require further validation.
A scientific overview of joint supplements
In 2022, researchers from the Faculty of Veterinary Medicine of Montreal published a systematic review of available clinical studies on food supplements for arthritic dogs and cats (Barbeau-Grégoire et al., IJMS 2022). Their analysis made it possible to establish a classification of the ingredients based on:
- the methodological quality of the available studies,
- the robustness of the effects observed on pain, mobility or inflammation,
- and the actual level of clinical evidence.
Among the 72 trials analyzed, Omega-3 fatty acids emerged as the most effective and best clinically documented active ingredients., far ahead of other widely marketed ingredients such as glucosamine, collagen or plant extracts.
Marine omega-3 (EPA/DHA): proven effectiveness in arthritic dogs
Long-chain omega-3s EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are naturally present in certain marine sources (oily fish, mussels, microalgae). They are known for their anti-inflammatory properties and their ability to modulate the immune response in joint tissues.
What studies show
- Roush et al. (2010) demonstrated a significant improvement in weight bearing and quality of life in arthritic dogs supplemented with oil rich in Omega-3.
- Magalhães et al. (2021) confirmed these benefits in a systematic review, highlighting theeffect of EPA/DHA on pain, inflammation and locomotion .
- The analysis by Barbeau-Grégoire (2022) classifies Omega-3 in category 1, i.e. highest level of evidence among all the assets studied.
Why favor specific marine sources?
Oils from New Zealand green lipped mussels and microalgae contain Omega-3 in the form of phospholipids and triglycerides.
They offer superior bioavailability, are better tolerated digestively, and have no impact on marine biodiversity.
🎯 To date, marine EPA and DHA are the only natural active ingredients to have demonstrated clinical efficacy in arthritic dogs, based on objective and reproducible parameters.
Oil, bites, tablets… which form of supplement should you choose?
Beyond composition, the dosage form of a supplement plays an essential role in its tolerance, bioavailability and ease of administration.
- Liquid oils are generally more concentrated in active ingredients and better absorbed by the body than solid forms (tablets or powders). They are also easier to adapt to the animal's weight.
- Appetizing snacks can make them easier to swallow, but often contain more additives and texturizing agents, and their dosage is sometimes imprecise.
- Tablets are often shunned by dogs, especially in cases of long-term or chronic treatment.
📌 For optimal effectiveness, it is best to choose a liquid form, based on natural oils rich in Omega-3, well tolerated, dosable to the nearest milliliter and easy to administer.
Glucosamine, chondroitin, collagen: popular but not very convincing active ingredients
Glucosamine & Chondroitin
- Historically widely used, but no scientific consensus validates their clinical efficacy in dogs.
- The study by Moreau et al. (2003) and the meta-analysis by Barbeau-Grégoire conclude that there is no significant benefit compared to placebo.
Collagen (hydrolyzed or UC-II®)
- Promising in theory, but broken down into peptides upon absorption: it does not directly reach the cartilage.
- No independent veterinary studies demonstrate effectiveness on canine pain or mobility.
ℹ️ These ingredients are not dangerous, but their clinical benefit remains uncertain to date. Their use can be considered as a supplement, but should not constitute the sole basis of joint supplementation.
Plants and plant extracts: curcumin, MSM, Boswellia, Harpagophytum
Some natural supplements contain plant extracts with recognized anti-inflammatory properties in humans. However, their application to veterinary medicine remains to be confirmed.
Cannabidiol (CBD)
- Some studies have observed improved locomotion and reduced pain in arthritic dogs treated with CBD at controlled doses.
- However, formulations, dosages, and extract profiles vary enormously among products, making rigorous assessment of efficacy difficult.
- CBD is not harmless: adverse effects have been reported (sedation, digestive disorders, elevated liver enzymes). It should be used under veterinary supervision, especially in fragile dogs or those undergoing medication.
- Finally, the legality of this active ingredient in Europe in food supplements for dogs remains to be defined; to date, a legal uncertainty remains.
Curcumin
- Low digestive bioavailability; requires specific formulations (micelles, lipids) to be absorbed.
- Studies mainly in vitro or on rodents; little or no clinical data in dogs.
MSM (methylsulfonylmethane)
- Well-tolerated sulfur antioxidant, but no study evaluates its effect alone in arthritic dogs.
- Often combined with other active ingredients, which makes its action difficult to isolate.
Boswellia & Harpagophytum
- Anti-inflammatory activity demonstrated in vitro.
- No published clinical studies in dogs; effects extrapolated from human or mouse models.
- Digestive irritant potential for Harpagophytum.
📌 These plant extracts may be of interest, but their use should remain secondary until rigorous veterinary clinical trials have validated their effectiveness.
PERNIXOL® : joint support rich in marine Omega-3
Formulated by the SENSILIA Laboratory, PERNIXOL® is a 100% natural liquid supplement, combining:
- New Zealand green lipped mussel oil (source of EPA + DHA),
- and microalgae oil rich in plant DHA.
Additive-free, easy to administer, highly digestible, PERNIXOL® relies on only natural active ingredients with clinically proven effectiveness in dogs with arthritic conditions.
🐶 For owners concerned about their dog's mobility and well-being, choosing reliable and validated sources like marine Omega-3 is the most rational strategy today.
Bibliography
Roush JK et al., Evaluation of the effects of dietary supplementation with fish oil omega-3 fatty acids on weight bearing in dogs with osteoarthritis, J Am Vet Med Assoc. 2010.
Magalhães TR et al., Therapeutic Effect of EPA/DHA Supplementation in Companion Animal Diseases: A Systematic Review, In Vivo. 2021.
Barbeau-Grégoire C et al., CBD and other nutraceuticals in veterinary arthritis: review and scoring. IJMS. 2022.
Moreau M et al., Clinical evaluation of a nutraceutical, carprofen and meloxicam for the treatment of dogs with osteoarthritis, Vet Rec. 2003.
Troncy E et al., Methodology for critical analysis of the literature on nutritional supplements for canine osteoarthritis, BAVF, 2022.
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