Across all 3 studies (2 reviews and 1 meta-analysis), 3 reported beneficial small-to-moderate effects of spirulina supplementation on reducing body mass index (BMI). The evidence shows a consistent direction of benefit, with effect sizes ranging from small to moderate. Specific findings include a meta-analysis reporting a mean reduction of -0.58 kg/m² (p=0.001) and another review reporting -0.40 kg/m² (p=0.025).
Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. 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). Effect sizes varied from small to moderate, and the wide dose range limits precise guidance.
BMI; WMD: -0.58 kg/m²; P = 0.001
This seaweed pigment can reduce obesity, body mass index (BMI), hypertension, hyperglycemia, and dyslipidemia.
Spirulina supplementation significantly reduced ... body mass index (BMI) (WMD: -0.40; p = 0.025)