Spirulina for Dogs: Benefits, Dosage, and Safe Use

References

Numbered references identify the sources used for specific claims. Read the study design, species and evidence boundaries alongside each finding.

1. [1]
   Stefanutti and colleagues. Oral Palatability and Owners’ Perception of the Effect of Increasing Amounts of Spirulina (Arthrospira platensis) in the Diet of a Cohort of Healthy Dogs and Cats. 2023Evidence boundary: This six-week, uncontrolled study used owner questionnaires and increasing amounts of whole-spirulina tablets. Fifty-two of 60 dogs completed; gastrointestinal departures occurred, and dog coat, scratching and activity scores did not improve significantly. The coat finding in cats was a separate result.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4 · ↩ 5 · ↩ 6 · ↩ 7 · ↩ 8 · ↩ 9 · ↩ 10 · ↩ 11 · ↩ 12 · ↩ 13 · ↩ 14 · ↩ 15 · ↩ 16
2. [2]
   Patel, Mishra and Ghosh. Antioxidant potential of C-phycocyanin isolated from cyanobacterial species Lyngbya, Phormidium and Spirulina spp. 2006Evidence boundary: The original abstract describes isolated C-phycocyanin reacting with radicals in chemical assays. It links activity to the attached colored component; no dogs received an oral supplement in these experiments.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4
3. [3]
   Satyaraj and colleagues. Supplementation of Diets With Spirulina Influences Immune and Gut Function in Dogs. 2021Evidence boundary: Thirty adult dogs received food with or without 0.2% spirulina for 42 weeks. Specific vaccine-antibody, fecal IgA and exercise-related bacterial-profile findings changed, while fecal scores did not. Nestlé Purina funded the study and employed all authors.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4 · ↩ 5 · ↩ 6 · ↩ 7 · ↩ 8 · ↩ 9 · ↩ 10 · ↩ 11 · ↩ 12 · ↩ 13
4. [4]
   Abdelhady and colleagues. Integrated effects of dietary supplementation of Spirulina platensis in working dogs: nutritional, biochemical, antioxidant, immunological, gut-related microbial and nutrigenomic insights. 2026Evidence boundary: Fifteen young male German Shepherd working dogs were assigned to three groups for seven weeks. Whole-powder supplementation changed blood antioxidant measurements; endurance and detection-task performance were not assessed.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4 · ↩ 5 · ↩ 6 · ↩ 7
5. [5]
   Minic and colleagues. Digestion by pepsin releases biologically active chromopeptides from C-phycocyanin, a blue-colored biliprotein of microalga Spirulina. 2016Evidence boundary: The original abstract reports simulated stomach digestion of C-phycocyanin into smaller pigment-bearing peptides with laboratory antioxidant activity. It does not measure canine absorption or tissue exposure.↩
6. [6]
   Stefanutti and colleagues. Effect of a weight loss diet with or without Spirulina supplementation on serum lipids and antioxidant capacity of overweight dogs. 2024Evidence boundary: Forty overweight dogs were randomized and 32 analyzed in this blinded 12-week trial. Both groups followed the same calorie-restricted diet; spirulina added no significant weight-loss or antioxidant benefit. Baseline imbalance complicates the exploratory triglyceride findings.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4 · ↩ 5
7. [7]
   La Petite Labs. Hollywood Elixir supplement panel and product directions. n.d.Evidence boundary: The supplement panel declares 50 mg spirulina per standard 2.5 g sachet. Product information supplies the complete recipe and guidance about the daily routine, size, tolerance and veterinary consultation.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4 · ↩ 5 · ↩ 6 · ↩ 7 · ↩ 8 · ↩ 9 · ↩ 10 · ↩ 11
8. [8]
   La Petite Labs. Hollywood Elixir Ingredients. n.d.Evidence boundary: The ingredient guide identifies Organic Spirulina Powder without a declared phycocyanin concentration. Its routine description includes wet-food mixing and use as a kibble topper.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4 · ↩ 5 · ↩ 6
9. [9]
   Watanabe and colleagues. Pseudovitamin B(12) is the predominant cobamide of an algal health food, spirulina tablets. 1999Evidence boundary: The original abstract describes assays and identification of B12-related compounds in spirulina tablets, including pseudovitamin B12. It is a composition study, not treatment of canine cobalamin deficiency.↩
10. [10]
    Salazar and colleagues. Subchronic toxicity study in mice fed Spirulina maxima. 1998Evidence boundary: The original abstract reports 13 weeks of Spirulina maxima feeding in mice, with no toxic effects in the assessed endpoints. The experiment does not set a safe upper supplement dose for dogs.↩
11. [11]
    Bautista and colleagues. Hepatopathy following consumption of a commercially available blue-green algae dietary supplement in a dog. 2015Evidence boundary: This dog’s severe liver illness followed use of a certified organic AFA supplement containing measured microcystins. The dog recovered after withdrawal and veterinary care. AFA is a different ingredient from spirulina.↩ 1 · ↩ 2 · ↩ 3
12. [12]
    U.S. Food and Drug Administration. Blue-Green Algae Products and Microcystins. n.d.Evidence boundary: Explains microcystin contamination and lot-related testing of blue-green-algae products, with detailed AFA examples. The guidance explains why appearance, smell and taste cannot establish the absence of these toxins.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4
13. [13]
    U.S. Centers for Disease Control and Prevention. For Veterinarians: Harmful Algal Bloom-Associated Illnesses. 2024Evidence boundary: Veterinary guidance covers suspected cyanotoxin illness from environmental exposure or contaminated supplements, including clinical signs and the importance of prompt care.↩ 1 · ↩ 2
14. [14]
    Vo Van Regnault / ANSES. Food supplements containing spirulina: choose trustworthy supply channels. 2018Evidence boundary: This official bulletin identifies cyanotoxins, bacteria and trace metals as possible quality concerns in spirulina supplements. Its broader nutrition and adverse-reaction advice concerns human use.↩
15. [15]
    Fletcher and colleagues. Nicotinamide riboside kinases display redundancy in mediating nicotinamide mononucleotide and nicotinamide riboside metabolism in skeletal muscle cells. 2017Evidence boundary: Mouse muscle and cell experiments explain the route from NR through NMN to NAD. They provide background for NR’s distinct biochemical role alongside a whole ingredient such as spirulina.↩