--- title: "Ascophyllum Nodosum for Pets | Petz Park" description: "Ascophyllum Nodosum (Norwegian Kelp) — active ingredient in Petz Park supplements. Ascophyllum Nodosum (Norwegian Kelp) in Petz Park supplements. 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[Home](/) 3. [Ingredients](/ingredients) 5. Ascophyllum Nodosum (Norwegian Kelp) # Ascophyllum Nodosum (Norwegian Kelp) Ascophyllum nodosum is a species of brown macroalgae (kelp) harvested from the North Atlantic, primarily from Norwegian and Canadian coastal waters. In veterinary dental health, it is the most evidence-supported dietary supplement ingredient available for plaque and tartar control in dogs and cats. ## Mechanism of Action Ascophyllum nodosum works systemically rather than topically. After ingestion, bioactive compounds including polyphenols and fucoidan are absorbed through the digestive tract and excreted into saliva. These compounds inhibit the bacterial glucosyltransferase enzyme that facilitates plaque biofilm formation on tooth surfaces. The result is a reduction in bacterial adhesion and biofilm accumulation on teeth throughout the day. The compound also has anti-inflammatory properties that support gum health and helps soften existing plaque deposits over time. ## Evidence Summary Ascophyllum nodosum has the strongest clinical evidence base of any dietary supplement used for pet dental health. A 2018 double-blind, randomised, placebo-controlled trial published in [Frontiers in Veterinary Science](https://doi.org/10.3389/fvets.2018.00058) examined the effect of Ascophyllum nodosum powder in dogs over 90 days. The study found approximately 40 percent reduction in plaque deposition and 20 percent reduction in calculus formation (tartar) compared to placebo. The product tested in this trial holds a VOHC (Veterinary Oral Health Council) Seal of Acceptance for plaque reduction, one of the most rigorous independent verifications available for pet dental products. The VOHC Seal requires that a product meet specific efficacy standards established by veterinary dental specialists. ## In Petz Park Products Plaque Control for Dogs: 1,000mg per scoop. Plaque Control for Cats: 500mg per scoop (lower dose calibrated for feline body weight). ## Safety and Considerations Ascophyllum nodosum contains natural iodine. It is not suitable for dogs or cats with thyroid disorders, as excess iodine can interfere with thyroid hormone regulation. Hyperthyroid cats, which are common in older cats, should not use Plaque Control for Cats. Confirm with a veterinarian before use in any animal with a known thyroid condition. ## Used in These Products Dog Products - [Plaque Control for Dogs](/dogs/products/plaque-control-for-dogs) Cat Products - [Plaque Control for Cats](/cats/products/plaque-control-for-cats) ## Helps With These Concerns Dog Health - [Dental Health for Dogs](/dogs/dental-health) Cat Health - [Dental Health for Cats](/cats/dental-health) [Back to Ingredients](/ingredients) Explore the Knowledge Centre - [All Ingredients](/ingredients) - [Dog Supplements](/dogs) - [Cat Supplements](/cats) - [Knowledge Centre Home](/) ![Petz Park](/images/petz-park-logo.png) Australian-made pet supplements for dogs and cats. ### Explore - [Home](/) - [Dogs](/dogs) - [Cats](/cats) - [Products](/products) - [Ingredients](/ingredients) - [Comparisons](/comparisons) - [FAQs](/faqs) - [About](/about) - [Trust & Proof](/trust) ### Dog Health - [Joint Health for Dogs](/dogs/joint-health) - [General Health and Vitality for Dogs](/dogs/general-health-vitality) - [Urinary and Kidney Health in Dogs](/dogs/urinary-kidney-health) - [Probiotics for Dogs](/dogs/probiotics) - [Liver Health for Dogs](/dogs/liver-health) - [Skin, Coat and Allergies in Dogs](/dogs/skin-coat-allergies) - [Brain and Cognitive Health in Dogs](/dogs/brain-cognitive-health) - [Anxiety and Stress in Dogs](/dogs/anxiety) - [Eye Health for Dogs](/dogs/eye-health) - [Dental Health for Dogs](/dogs/dental-health) - [Senior Dog Health](/dogs/senior-dog-health) - [Immune and Seasonal Health for Dogs](/dogs/immune-seasonal-health) ### Cat Health - [Joint Health for Cats](/cats/joint-health) - [Anxiety and Stress in Cats](/cats/anxiety) - [Dental Health for Cats](/cats/dental-health) - [Liver Health for Cats](/cats/liver-health) - [Skin, Coat and Allergies in Cats](/cats/skin-coat-allergies) - [General Health and Vitality for Cats](/cats/general-health-vitality) - [Urinary and Kidney Health in Cats](/cats/urinary-kidney-health) - [Eye Health for Cats](/cats/eye-health) - [Probiotics for Cats](/cats/probiotics) ### Contact - [petzpark.com.au](https://petzpark.com.au/?utm_source=knowledgecentre&utm_medium=ingredient_article&utm_campaign=ascophyllum_nodosum&utm_content=navigation) [Instagram](https://www.instagram.com/petzpark "Instagram")[Facebook](https://www.facebook.com/petzpark "Facebook")[TikTok](https://www.tiktok.com/@petzpark "TikTok") © 2026 Petz Park. 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