Ergothioneine for Cardiovascular Disease
Higher blood levels of ergothioneine track with better heart outcomes in long-term observational studies, but no trial has tested whether actually taking ergothioneine lowers cardiovascular events or death. On current evidence it is an interesting marker, not a proven heart supplement.
Why this grade7-layer evidence engine
The grade reflects a consistent but observational-only signal. The anchor study is a Malmo Diet and Cancer prospective cohort with 21.4 years of follow-up (Smith 2020, PMID 31672783), in which people with higher baseline plasma ergothioneine had significantly lower coronary disease, cardiovascular death, and all-cause mortality. A mushroom-intake analysis (mushrooms are the main dietary source) found a small mortality benefit in pooled data (RR 0.94) but no significant effect in NHANES alone (PMID 34548082), and two reviews simply restate the association and call for clinical trials (PMID 38018890; PMID 35370675).
Why it cannot rank higher: there are zero randomized controlled trials testing ergothioneine supplementation against any cardiovascular endpoint. Blood ergothioneine likely acts as a proxy for a healthy, mushroom- and vegetable-rich diet and better overall health, so residual confounding cannot be ruled out. The compound also accumulates in damaged, high-oxidative tissue including the heart, which even raises the possibility of reverse causation.
Authorities reinforce the caution. The US FDA recognizes synthetic L-ergothioneine only through the GRAS safety pathway, and EFSA cleared it as a novel food on safety grounds ("Safety of synthetic L-ergothioneine (Ergoneine) as a novel food") - neither is a health-benefit endorsement. The UK NHS, WHO, NIH Office of Dietary Supplements, Mayo Clinic, Cleveland Clinic, Harvard Health, and cardiology bodies do not address it for heart disease. Association is not causation here, so it should not replace proven cardiovascular care.
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 = 0.53
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 僅有 E8 級證據 (cohort/animal/mechanism)，不足以下結論
- 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