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Epo7.5
Evening Primrose Oil Research
Mostly mechanism / observationalHigh safety
15 peer-reviewed studies
What the evidence says
Mostly mechanism / observational
Most Evening Primrose Oil studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2007–2025 with a typical study size of 400 participants.
Based on 15 studies · 6 meta-analyses · 3 RCTs · 3,813 total participants
Confidence
High
What the studies found
2helped· 13 more without graded effect data
By outcome
Women's healthMay help manage menopausal symptoms like hot flashes and mood changes · 4-8 weeks · Supports healthy estrogen metabolism and hormonal equilibrium · 4-8 weeks · May help reduce menstrual discomfort and PMS symptoms · 1-3 cycles
InflammationGLA converts to anti-inflammatory DGLA · 4-8 weeks
Mostly mechanism / observational4 studies
Joint pain & arthritis
Too few graded studies1 study
Heart & blood pressure
Too few graded studies1 study
Cholesterol & lipids
Too few graded studies1 study
Immune support
Too few graded studies1 study
Safety profile
Too few graded studies1 study
By the numbers
Pulled from 7 studies with measurable effects
Likely real effects
100%
across studies
People studied
3,813
typical study: 400 people
Strongest designs
9
6 pooled, 3 randomised
Showed benefit
100%
2/2 studies
Populations Studied
Patients with acne1
Patients with inflammatory diseases1
Adults with diabetic peripheral neuropathy1
Women with mastalgia1
Active research area
8 studies in the last 5 years · Latest meta-analysis: 2024
200720162025
1Meta-AnalysisCited 61×n=1,596 · large study2013
With regard to the risk of bias, the majority of studies were of low risk of bias; we judged 67% of the included studies as having low risk of bias for random sequence generation; 44%, for allocation concealment; 59%, for blinding; and 37%, for other biases.
Bamford JT et al. · The Cochrane database of systematic reviews (2013)
With regard to the risk of bias, the majority of studies were of low risk of bias; we judged 67% of the included studies as having low risk of bias for random sequence generation; 44%, for allocation concealment; 59%, for blinding; and 37%, for other biases.
Allergy published by European Academy of Allergy and Clinical Immunology and John Wiley & Sons Ltd.
Vassilopoulou E et al. · Allergy (2024)
A meta-analysis of 20 RCTs assessing probiotics, alone or combined with prebiotics, revealed a significant reduction in SCORAD scores, suggesting a consistent trend in alleviating AD symptoms in children without food allergies.
The review encompassed 27 RCTs examining prebiotics, Vitamin D, evening primrose oil, and substituting cow's milk formula with partially hydrolyzed whey milk formula.
Nonetheless, evidence for other dietary interventions remains limited, underscoring the necessity for well-designed intervention studies targeting multiple factors to understand etiological interactions and propose reliable manipulation strategies.
Some evidence regarding the potential benefits of EPO in inflammatory disorders were reported however caution is due to the limitations of the current survey.
Sharifi M et al. · BMC complementary medicine and therapies (2024)
In rheumatoid arthritis, mixed results were observed, with some studies reporting significant improvements in symptoms while others found no significant impact.
Some evidence regarding the potential benefits of EPO in inflammatory disorders were reported however caution is due to the limitations of the current survey.
Overall, contemporary literature is highly heterogeneous and fails to provide strong recommendations regarding the efficacy of EPO on inflammatory disorders.
7Total Symptom Score improvement in diabetic neuropathyMeta-AnalysisCited 6×n=11 · very small study2024
ALA and GLA appear to be safe and efficacious biofactors for improvement of DN symptoms.
Prado MB Jr et al. · Canadian journal of diabetes (2024)
Huge benefit
← WorseNo effectBetter →
Likely real
Eight of the 11 articles (73%) reported significant benefit of ALA vs placebo.
In the meta-analysis, the Total Symptom Score (TSS) for ALA 600 mg/day (ALA600) was 1.05 points lower (standard mean difference [SMD] -1.05, 95% confidence interval [CI] -2.07 to -0.04, p=0.04, I2=98.18%) compared with control at the end of the study.
In the network meta-analysis, ALA600 (SMD -1.68, 95% CI -2.8 to -0.6) and GLA (SMD -2.39, 95% CI -4.3 to -0.5) had significantly lower TSSs compared with placebo.
In this systematic review we present information relating to the effectiveness and safety of the following interventions: antibiotics, bromocriptine, combined oral contraceptive pill, danazol, diuretics, evening primrose oil, gestrinone, gonadorelin analogues, hormone replacement therapy (HRT), lisuride, low-fat diet, progestogens, pyridoxine, tamoxifen, tibolone, topical or oral non-steroidal anti-inflammatory drugs (NSAIDs), toremifene, and vitamin E.
In this systematic review we present information relating to the effectiveness and safety of the following interventions: anticonvulsants, antihypertensive drugs, antioxidants, antiplatelet drugs, atenolol, bed rest, hospital admission, or day care, calcium supplementation, choice of analgesia during labour, early delivery (interventionist care), evening primrose oil, fish oil, glyceryl trinitrate, magnesium supplementation, plasma volume expansion, and salt restriction.
These data indicate that a nutraceutical containing a combination of four medicinal herbs effectively and safely improved menopausal symptoms, as well as general health indicators, in post-menopausal women.
Rattanatantikul T et al. · Journal of dietary supplements (2022)
There were no significant differences in hormonal levels between the test and placebo groups, however levels of C-reactive protein were significantly decreased.
These data indicate that a nutraceutical containing a combination of four medicinal herbs effectively and safely improved menopausal symptoms, as well as general health indicators, in post-menopausal women.