Across 3 studies (2 systematic reviews/meta-analyses and 1 meta-analysis), 2 reported beneficial small effects of spirulina supplementation on reduced body weight, with statistically significant reductions observed in overweight and obese adults and general adult populations (e.g., weight loss of -1.78 kg, g = -0.30). One neutral finding came from a study in children and adolescents, which found no statistically significant effect. No consistent dose or form data were reported across studies.
Caveats: Evidence is based on only 3 studies, one of which showed no significant effect in children and adolescents, limiting generalizability. Doses and study durations were not consistently reported, making it difficult to determine optimal usage. Clinical significance of the small weight reduction (e.g., -1.78 kg) is unclear.
Spirulina supplementation alone significantly reduced body weight (g = -0.30, 95% CI: -0.53 to -0.08)
The pooled SMD for weight changes was -0.526 (95% CI, -1.289 to 0.236), indicating no statistically significant effect (p = 0.176).
weight; WMD: -1.78 kg; P = 0.003