Chlorella for Hypertension
Chlorella may modestly lower blood pressure, but the evidence is inconsistent and the effect is small and of uncertain clinical importance. It is not a substitute for proven treatments, and no health authority or clinic endorses it for hypertension.
Why this grade7-layer evidence engine
The grade is weak because the trial evidence points in conflicting directions. Two meta-analyses found a statistically significant but small drop in systolic blood pressure: roughly 4.5 mmHg in a 2018 pooled analysis of 19 trials (PMID 29037431) and about 3.7 mmHg in a 2025 GRADE-assessed review (PMID S2211926425003923), with only borderline effects on diastolic pressure.
However, two 2025 meta-analyses substantially weaken that signal. One found chlorella had a neutral, non-significant effect on blood pressure, with the benefit attributable to spirulina, and it carried an industry conflict of interest (PMID 40289965). A broader edible-algae analysis of 1,583 people likewise showed the blood-pressure reduction was driven by spirulina, with chlorella not flagged as an independent contributor (PMID 40726022). An early 2002 pilot found only 25% of patients responded (PMID 12495586).
Authoritative backing is absent. No major clinic or society, Mayo, Cleveland Clinic, Harvard, or hypertension specialty bodies, takes any position on chlorella for blood pressure. The US FDA has acted against products claiming chlorella reduces high blood pressure, and the EU EFSA rejected related health claims. Chlorella is also high in vitamin K and can interfere with the blood thinner warfarin, a concern for many people with hypertension.
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditable▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.472
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 顯示 positive (2 篇 > 0 negative)
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status