Skip to main content
Evidence-Based Supplement Research
Evidence-Based Supplement Research
Pillser
Search
Sign UpLog In

Spirulina and Reduced Body Weight

Research synthesisModerate evidenceSmall effect5 studies · 4 beneficial · 1 neutral · 0 harmful

Across 5 studies, 4 reported beneficial small-sized effects of spirulina supplementation on reducing body weight, with 1 neutral finding in children and adolescents. Evidence from meta-analyses in overweight and obese adults shows a statistically significant but small reduction (e.g., g = -0.30, 95% CI: -0.53 to -0.08; WMD: -1.78 kg). The most-studied population is adults, and doses ranged from 20 mg to 6 g, though no consistent dose range was identified.

  • Studied populations: overweight and obese adults, adults with metabolic syndrome

Caveats: Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). The one neutral finding was in children and adolescents, suggesting age may moderate the effect. Study durations were not consistently reported, making it difficult to assess time-to-effect.

Generated Jun 9, 2026
Doses used in studies
  • mg/day: 20–6,000 (median 3,010, IQR 20–6,000) — 1 study
5 of 5 papers
Back to top