Rhodiola Rosea for Stress
A handful of small, low-quality trials hint that Rhodiola rosea may ease subjective life-stress and burnout symptoms, but the evidence is too weak and too heavily industry-funded to treat it as a proven stress remedy. Anyone on blood thinners, antidepressants, or blood-pressure or blood-sugar medication should check with a clinician before using it.
Why this grade7-layer evidence engine
Rhodiola lands at a Weak (C) grade because every supporting human study is methodologically fragile. Four reports drive the verdict: an open-label, single-arm life-stress trial with no placebo (PMID 22228617, n=101, 4 weeks); a single-blind mood study whose comparison group got no treatment rather than a placebo (PMID 26502953, n=80, 2 weeks); an open-label burnout trial (PMID 28367055, n=118, 12 weeks); and a narrative systematic review (PMID 35745023). All reported improvement, but each was rated low quality, and there is no double-blind randomized trial and no formal meta-analysis.
Two issues cap the result. The positive data come almost entirely from one proprietary extract (WS 1375 / SHR-5), so findings may not carry over to ordinary Rhodiola products on the shelf. And most of the studies were industry-funded — the manufacturer behind WS 1375 and review authors tied to a supplement firm — a conflict of interest the system flags as a soft dispute. Even the 2022 review (PMID 35745023) calls the evidence only "encouraging," not definitive.
Authorities stay cautious. The UK registers Rhodiola only as a traditional herbal medicine based on long use, not proven efficacy, and the US FDA has issued warning letters against disease claims and approves no health claim. Cleveland Clinic notes some performance benefit under stress but says more research is needed, while NIH/NCCIH considers the evidence insufficient and Mayo, Harvard, and the APA do not endorse it. Reported interactions with blood thinners, antidepressants, and blood-pressure or blood-sugar drugs make medical advice sensible.
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 = 0.551
- 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 — | B→C 因 scope.conflation_risk=true 且 L11 獨評較低 (B7-2 tier cap)
- detect_disputes — 偵測到 0 個 hard + 1 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status