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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Spirulina and Reduced Diastolic Blood Pressure

Research synthesisModerate evidenceModerate effect3 studies · 3 beneficial · 0 neutral · 0 harmful

Across all 3 studies, spirulina supplementation was consistently associated with beneficial moderate-sized reductions in diastolic blood pressure. Two meta-analyses reported reductions of approximately -2.84 mmHg and -3.09 mmHg, and a systematic review reported a moderate effect size (g = -0.73). The most studied population was overweight and obese adults, though other meta-analyses included general healthy adults over 18 years.

  • Studied populations: overweight and obese adults; adults over 18 years

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). Dosing and study durations were not consistently reported, limiting precision of effect estimates.

Generated Jun 13, 2026
3 of 3 papers
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