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Spirulina Dosage Guide

Evidence:Moderate
·

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

General Dosage

1-3g daily, taken with or without food

Maximum dose: 8g/day (doses up to 19g/day have been used in short-term studies without serious adverse effects)

Dosage Recommendations

General recommendation: 1-3g daily, taken with or without food

Timing: Can be taken any time of day; splitting doses across meals may improve tolerability at higher doses

Dosage by Condition

General health / antioxidant support
1-3g dailyModerate
Cholesterol reduction
2-8g dailyModerate
Allergic rhinitis
2g dailyModerate
Immune support
2-5g dailyEmerging
Blood sugar management
2-4g dailyEmerging

Upper limit: 8g/day (doses up to 19g/day have been used in short-term studies without serious adverse effects)

Timing & Absorption

Can be taken any time of day; splitting doses across meals may improve tolerability at higher doses

Can be taken with or without food.

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References

  1. Meta-analysisHuang H, Liao D, Pu R, Cui Y (2018). Quantifying the effects of spirulina supplementation on plasma lipid and glucose concentrations, body weight, and blood pressure. Diabetes, Metabolic Syndrome and Obesity. DOI PubMed
  2. RCTSelmi C, Leung PS, Fischer L, German B, Yang CY, Kenny TP, Cysewski GR, Gershwin ME (2011). The effects of Spirulina on anemia and immune function in senior citizens. Cellular & Molecular Immunology. DOI PubMed
  3. RCTCingi C, Conk-Dalay M, Cakli H, Bal C (2008). The effects of spirulina on allergic rhinitis. European Archives of Oto-Rhino-Laryngology. DOI PubMed
  4. Finamore A, Palmery M, Bensehaila S, Peluso I (2017). Antioxidant, immunomodulating, and microbial-modulating activities of the sustainable and ecofriendly spirulina. Oxidative Medicine and Cellular Longevity. DOI PubMed
  5. Mazokopakis EE, Papadomanolaki MG, Fousteris AA, Kotsiris DA, Lampadakis IM, Ganotakis ES (2014). The hepatoprotective and hypolipidemic effects of Spirulina (Arthrospira platensis) supplementation in a Cretan population with non-alcoholic fatty liver disease. Turkish Journal of Gastroenterology. PubMed
  6. Mbajiorgu CA, Ogbuewu IP, Mabelebele M (2026). Meta-Analysis of the Efficacy of Spirulina Intervention in Mitigating the Negative Impact of Heat Stress on Production Physiology and Health Indices of Broilers.. Journal of animal physiology and animal nutrition. DOI PubMed
  7. Hariri M, Azizi-Soleiman F, Baradaran HR, Heshmati M, et al. (2026). Spirulina Supplementation Can Reduce Serum Levels of C-Reactive Protein: A Systematic Review and Meta-Analysis on Randomized Clinical Trials.. International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition. DOI PubMed
Show 3 more references
  1. Meta-analysisShiri H, Soleimani AA, Omidi Sarajar B, Talebi Taheri A, et al. (2025). Spirulina's impacts on cardiovascular health: Insights from a systematic meta-analysis of RCT.. Complementary therapies in medicine. DOI PubMed
  2. Pinto-Leite M, Martins D, Ferreira AC, Silva C, et al. (2025). The Role of Chlorella and Spirulina as Adjuvants of Cardiovascular Risk Factor Control: A Systematic Review and Meta-Analysis of Randomised Controlled Trials.. Nutrients. DOI PubMed
  3. Meta-analysisShiri H, Yasbolaghi Sharahi J, Alizadeh Sani M, Mousavi SMJ, et al. (2025). The Effect of Spirulina Supplementation on Blood Pressure in Adults: A GRADE-Assessed Systematic Review and Meta-Analysis of Randomized Clinical Trials.. Phytotherapy research : PTR. DOI PubMed