Chlorella for Immune Function
Chlorella may nudge a few laboratory markers of immune activity, but the evidence is weak and preliminary, and there is no proof it actually helps you get sick less often or recover faster. Treat any "immune-boosting" marketing with caution.
Why this grade7-layer evidence engine
The grade is C (weak evidence) because the entire human case rests on four small randomized trials, none larger than 124 participants, and almost all of them measured surrogate immune markers rather than real-world outcomes. An 8-week trial of 5 g/day raised natural-killer-cell activity and the cytokines IFN-gamma and IL-1beta (PMID 22849818), while two small trials reported higher salivary secretory IgA, a marker of mucosal immunity (PMID 28825174; PMID 21906314). These signals are directionally consistent, which keeps the grade above 'no evidence,' but the trials were rated low quality, several used multi-ingredient 'chlorella-derived' products, and none tracked infections or illness duration.
The single trial with a clinically meaningful endpoint undercuts the optimistic reading. In 124 adults given chlorella before an influenza vaccine, there was no significant improvement in antibody response in the overall group; only a small, after-the-fact subgroup aged 50-55 showed a signal, which is hypothesis-generating at best (PMID 12874157). No immune-function-specific systematic review or meta-analysis exists, so the body of evidence stays small and inconsistent rather than confirmatory.
Major authorities offer no endorsement. The NIH Office of Dietary Supplements is cautious, while Mayo Clinic, Cleveland Clinic and Harvard Health do not address chlorella for immunity at all; EFSA has rejected related health claims and the FDA treats unproven 'detox'/chelation claims as having no proof of effectiveness. Chlorella is also high in vitamin K and can interfere with the blood thinner warfarin, so people on that medication or on immunosuppressants should check with a clinician first.
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 = 0.485
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 無高階證據可裁決
- 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