Research · Randomised controlled trial
Efficacy of daily spirulina supplementation on iron status of pregnant women
Ngo-Matip et al. · 2015 · Nutrition Journal
Key finding
Daily spirulina supplementation significantly increased haemoglobin, serum ferritin, and transferrin saturation compared to controls. The spirulina group saw haemoglobin rise by 1.2 g/dL versus 0.3 g/dL in the control group.
Why this matters for consumers
One of the clearest RCTs demonstrating spirulina's effect on iron status in a clinically iron-deficient population. The 10 g dose is high by consumer standards, but the direction of effect is meaningful even at lower doses in other studies.
Study limitations
10 g/day dose is higher than typical consumer use; results may not fully extrapolate to 1–3 g/day regimes.
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