Evening Primrose Oil for Menopause

Evening primrose oil is widely used for hot flushes but performs no better than placebo in most trials.

Overview

Evening primrose oil is widely used for hot flushes but performs no better than placebo in most trials.

Verdict

Insufficient evidence

How It Works

Gamma-linolenic acid is a precursor to series-1 prostaglandins, proposed to influence vascular tone and inflammatory signalling.

Dosing & Protocol

Typical dose

Recommended dose: No established dose — evidence is insufficient. Menopause trials used 500-2000 mg/day (about 40-160 mg GLA) with results close to placebo.
Expected timeframe: No benefit demonstrated over 6-12 weeks

Protocol

dose: Not established for menopause
form: Evening primrose oil softgels standardised to 8-10% GLA
steps: Evidence is insufficient: randomised trials at 500-2000 mg/day have not shown reliable benefit for hot flashes or overall menopausal symptom scores compared with placebo,Evening primrose oil is not a phytoestrogen and does not act on oestrogen receptors, so the mechanism people assume is not there,Discuss menopausal hormone therapy with your clinician — for most women within 10 years of their final period it is the most effective option and the risk profile is often misunderstood,Non-hormonal prescription options with evidence include SSRIs/SNRIs, gabapentin and fezolinetant; local vaginal oestrogen treats genitourinary symptoms,Prioritise sleep, resistance training, weight management and alcohol reduction, which measurably affect symptom burden,Any bleeding after the menopause needs urgent medical assessment
timing: n/a
duration: Trials ran 6-12 weeks

Evidence

What the studies say

A randomised placebo-controlled trial found no reduction in hot flush frequency compared with placebo, and systematic reviews conclude the evidence does not support routine use for vasomotor symptoms.

No studies are yet linked to both Evening Primrose Oil and Menopause.

Safety

Caveats

Insufficient evidence. Lowers the seizure threshold — avoid with epilepsy and phenothiazine antipsychotics. Antiplatelet activity adds bleeding risk with warfarin, DOACs, aspirin and clopidogrel; stop 2 weeks before surgery. Avoid in pregnancy. Do not let a supplement trial delay a proper menopause consultation.

Less likely to help if

Most women in controlled trials, particularly those with moderate-to-severe vasomotor or genitourinary symptoms.

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Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.