Evening Primrose Oil for Skin Health
Verdict: Counter-Evidence
Across 5 PubMed studies, the evidence for Evening Primrose Oil in Skin Health grades Tier D — counter-evidence. High-quality evidence indicates it is not effective (or is harmful) for this use.
D 🔴 D Counter-Evidence Counter-Evidence
Why this grade7-layer evidence engine
⚖️
Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditableRaw score 0.23
D
C
B
A
S
← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
D · Counter-Evidence
Confidence
80%
Highly consistent evidence
Evidence level
E1
Cochrane high-quality SR/MA
▸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 = 0.233
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高階證據未達主導 (0 positive vs 1 negative)，由 raw_score 決定
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 1 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status
PubMed studies (5)L2 · primary research & systematic reviews
Oral evening primrose oil and borage oil for eczema (Cochrane Systematic Review)
Finding: Across 19 RCTs (7 EPO trials with 176 participants assessed for global severity; 8 borage oil trials) oral EPO and borage oil produced NO clinically meaningful effect on eczema vs placebo (participant-assessed global eczema symptoms SMD -0.02, 95% CI -0.24 to 0.20; investigator-assessed SMD 0.00); the authors concluded oral EPO and borage oil are not effective for eczema and further studies were unlikely to change this conclusion.
View on PubMed Efficacy and tolerability of borage oil in adults and children with atopic eczema: randomised, double blind, placebo controlled, parallel group trial
Finding: Over 12 weeks borage oil produced no statistically significant improvement over placebo in the SASSAD total symptom score (treatment effect 1.4, 95% CI -2.2 to 5.0) in adults nor children with atopic eczema; topical steroid potency requirements did not differ.
View on PubMed Evening primrose oil (Epogam) in the treatment of chronic hand dermatitis: disappointing therapeutic results
Finding: After 16 weeks of treatment EPO showed no statistically significant clinical benefit over placebo for chronic hand dermatitis; both groups improved equivalently, consistent with the broader EPO atopic-dermatitis literature.
View on PubMed Effect of Evening Primrose Oil on Korean Patients With Mild Atopic Dermatitis: A Randomized, Double-Blinded, Placebo-Controlled Clinical Study
Finding: After 4 weeks, mild-to-moderate atopic dermatitis patients receiving 320 mg/day EPO showed a small reduction in EASI vs placebo (EASI mean change -1.5 vs -0.5, p<0.05), but the absolute clinical magnitude was modest, the dose was low, and follow-up was short.
View on PubMed Diet and eczema: a review of dietary supplements for the treatment of atopic dermatitis
Finding: Pooled across heterogeneous trials EPO did not show a statistically robust improvement in SCORAD vs placebo; the authors note marked heterogeneity, small studies, industry sponsorship and publication bias, and that the Cochrane review's negative conclusion remains the most defensible synthesis.
View on PubMed Regulatory & authoritative positionsL4/L5 · FDA / EMA / NIH ODS / Cochrane / Mayo …
L4a US FDA
Cautious
In 1985, FDA issued a series of Import Alerts announcing that Evening Primrose Oil could not be sold lawfully in the United States without FDA approval, that the substance did not have FDA approval, and that all import shipment of evening primrose oil offered for entry into the U.S. were to be detained by Customs. source↗
L4b EU EFSA
Against
L4c UK NHS
Against
[NHS.uk, menopause herbal remedies page] Evening primrose oil is listed among herbal remedies "sometimes taken for menopause symptoms"; the page warns that such herbal remedies "are not tested and regulated in the same way as medicines such as hormone replacement therapy (HRT), so it's not known how safe and effective they are", may "cause unpleasant side effects", and that "the quality, purity… source↗
L4d TW TFDA / 衛福部
Neutral
在台灣食品法規下，月見草油不得標示療效，也不得聲稱療效。除健康食品外，一般食品均不得宣稱保健功效。 source↗
L5a NIH Office of Dietary Supplements
Cautious
There's not enough evidence to support the use of evening primrose oil for any health condition. ... Evening primrose oil, taken orally, has not been shown to be helpful for relieving symptoms of atopic dermatitis. ... Evening primrose oil is probably not more effective than a placebo (an inactive substance) for breast pain. ... There's insufficient evidence to show whether evening primrose oil… source↗
L5b Mayo Clinic
Cautious
Most research on the use of evening primrose offers little to no help for atopic dermatitis, also called eczema. Evening primrose oil is likely safe for most people to take for a short time, but research hasn't found that the supplement treats any condition. source↗
L5c Cleveland Clinic
Against
L5e Specialty Society (condition-mapped)
Against