Onion Juice (Allium cepa) for Hair Loss Telogen
There is no direct human evidence that onion juice (Allium cepa) treats telogen effluvium, the stress-related diffuse shedding form of hair loss. The engine grades this Unverified (insufficient evidence), so it cannot be recommended for this condition.
Why this grade7-layer evidence engine
This claim is graded U (Unverified / Insufficient Evidence) because a PubMed search returned zero randomized, cohort, or controlled clinical studies of onion juice for telogen effluvium specifically. The evidence reaches only the mechanism / no-human-data level, so the engine has nothing to grade efficacy on and no conclusion about whether it works can be drawn.
The single human onion-juice trial, Sharquie 2002 (PMID 12196747), studied alopecia areata, an autoimmune disorder, not telogen effluvium. The two conditions have different biology: alopecia areata involves immune attack on the follicle, whereas telogen effluvium is a non-inflammatory disruption of the hair cycle driven by systemic triggers such as childbirth, illness, iron deficiency, or thyroid problems. Results from one cannot be extrapolated to the other.
Regulators and clinics do not support this use. The US FDA lists onion only as a GRAS food, and the WHO monograph records only traditional oral uses with no hair indication; EFSA, the NHS, and the surveyed specialty societies and clinics are silent. Importantly, telogen effluvium is self-limiting and usually resolves within three to six months once the trigger is removed, so anecdotal reports of success most likely reflect natural recovery rather than any effect of onion juice.
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 = 0.44
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 僅有 E10 級證據 (cohort/animal/mechanism)，不足以下結論
- tier_strict_requirement_check — C 級條件未達 (需 E1-E8；實際 E10 僅機轉)
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status