Research · Meta-analysis
Spirulina supplementation and body weight: a systematic review and meta-analysis
Colla et al. · 2020 · Nutrients
Key finding
Spirulina supplementation produced a statistically significant reduction in body weight (mean −0.9 kg), BMI, and waist circumference compared to placebo. Effects were stronger in studies using higher doses (≥ 4 g/day) and longer duration (≥ 12 weeks).
Why this matters for consumers
A systematic meta-analysis on weight outcomes — a frequently claimed benefit that is poorly evidenced in most supplement contexts. The −0.9 kg average effect is modest but real and statistically robust. It likely reflects downstream effects of improved insulin sensitivity and lipid metabolism rather than direct fat-burning activity.
Study limitations
Heterogeneous populations; short study durations; confounding from diet and exercise differences between trials.
Related studies
Spirulina maxima prevents induction of fatty liver by carbon tetrachloride
Torres-Durán et al. · 2007
Antihyperlipidemic effects of spirulina in patients with type 2 diabetes
Mani et al. · 2000
Supplementation with spirulina in a standard anti-diabetic regimen
Parikh et al. · 2001
Anti-obesity and anti-inflammatory effects of spirulina in obese adults
Park et al. · 2008
New research, when it matters
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