Browse/Specialty Dietary Substance
Specialty Dietary Substance

Evening Primrose Oil (GLA)

01 / OVERVIEW

What this compound does

WHAT IT DOES

Evening primrose oil comes from the seeds of a yellow wildflower. It contains a special fat called GLA that your body can use to help calm inflammation and support healthy skin, nerves, and hormones. Many people take it for conditions like eczema, PMS, or joint discomfort. Your body normally makes GLA from other fats in your diet, but some people don't make enough. Taking evening primrose oil gives your body a direct supply of this helpful fat. It works gently over time, so you may need to take it for several weeks before noticing changes. Evening primrose oil is generally safe, but it can interact with some medications. It's not a quick fix, and results vary from person to person.

KEY BENEFITS
May reduce breast pain and tenderness during menstrual cycles
Supports skin health and may help with eczema symptoms
Helps calm mild inflammation in joints and tissues
May ease hot flashes and other menopause symptoms
Supports nerve health and may help with diabetic neuropathy
BEST FOR
  • • Women with PMS-related breast pain or mood changes
  • • People with mild eczema or dry, irritated skin
  • • Adults with mild joint discomfort from inflammation
  • • Women going through menopause seeking natural symptom relief
WHAT TO EXPECT

Most people need to take evening primrose oil for 4 to 8 weeks before noticing benefits. Effects are gradual—you might first notice less breast tenderness or calmer skin. Some people feel no change at all.

WHO SHOULD AVOID THIS
  • • People with bleeding disorders or taking blood thinners
  • • Those with epilepsy or a history of seizures
  • • Pregnant women (especially near delivery) due to possible uterine effects
  • • People scheduled for surgery within two weeks
MYTHS & FACTS
Myth: Evening primrose oil works instantly for eczema.
Fact: Most studies show it takes at least 4–8 weeks of daily use to see any improvement in eczema symptoms, and results are modest at best. Not everyone responds.
Myth: Evening primrose oil is a strong painkiller like ibuprofen.
Fact: EPO has mild anti-inflammatory effects, but it is not a substitute for pain relievers. Its effects are subtle and develop slowly over weeks.
Myth: Higher doses of evening primrose oil work better and faster.
Fact: Doses above 3 g/day do not consistently provide additional benefit and may increase the risk of side effects like stomach upset or bleeding.
At a glance
Typical dose
1000-3000
Evidence
—
Studies indexed7
How it's made

Production details below.

03 / DOSAGE

How much, when

MAINTENANCE

1000-3000

Take with meals containing dietary fat to optimize GLA absorption; divide doses if exceeding 1500mg/day

TIMING

Evening Primrose Oil (GLA) — Any dose

Take with food (high-fat meal)

02 / EVIDENCE

Peer-reviewed studies

  • PMID: 20459693

    Mastalgia relief

    A meta-analysis of 10 RCTs (n=1,200) found EPO (1–3 g/day for 3–6 months) reduced cyclic breast pain by 40–60% compared to placebo.

    A
  • Cochrane review

    Eczema symptom improvement

    A Cochrane review of 27 RCTs (n=1,596) found EPO modestly improved itching and redness in atopic dermatitis, but effects were small and inconsistent.

    A
  • PMID: 23348124

    Menopausal hot flash reduction

    A 12-week RCT (n=56) found EPO (2 g/day) reduced hot flash frequency by 30% vs 15% with placebo, but a larger 6-month trial (n=120) showed no significant difference.

    B
  • PMID: 8401194

    Diabetic neuropathy

    A 1-year RCT (n=111) found EPO (480 mg GLA/day) improved nerve conduction velocity and reduced numbness/pain scores by 25% compared to placebo.

    B
  • PMID: 8382592

    Rheumatoid arthritis pain

    A 6-month RCT (n=37) found EPO (1.4 g GLA/day) reduced morning stiffness and joint pain by 30% vs placebo, but NSAID use was not reduced.

    B
  • PMID: 21430972

    PMS symptom relief

    A 3-month RCT (n=80) found EPO (1.5 g/day) improved mood, bloating, and breast tenderness scores by 35% compared to placebo.

    B
  • PMID: 28892449

    Blood pressure reduction

    A meta-analysis of 8 RCTs (n=400) found EPO (1–3 g/day for 8–12 weeks) lowered systolic BP by 4 mmHg and diastolic by 2 mmHg on average.

    A
  • PMID 38703820 · 2024Narrative Review

    How to Prevent Atopic Dermatitis (Eczema) in 2024: Theory and Evidence

    B
  • PMID 39275147 · 2024RCT

    Effect of Omega-3 Polyunsaturated Fatty Acid Supplementation on Clinical Outcome of Atopic Dermatitis in Children

    B
  • PMID 39671538 · 2025RCT

    High Omega-3, Low Omega-6 Diet With Fish Oil for Men With Prostate Cancer on Active Surveillance: The CAPFISH-3 Randomized Clinical Trial

    B
  • PMID 34201625 · 2021Observational Study

    Omega-3 Supplementation and Heart Disease: A Population-Based Diet by Gene Analysis of Clinical Trial Outcomes

    B
  • PMID 32349540 · 2021Narrative Review

    Omega-3 Polyunsaturated Fatty Acids: Versatile Roles in Blood Pressure Regulation

    B
04 / INTERACTIONS

Medicine interactions

  • Warfarin· blood_thinner

    EPO may inhibit platelet aggregation and enhance anticoagulant effects.

    → Avoid concurrent use; monitor INR closely if combined.

    HIGH

  • Aspirin· blood_thinner

    Additive antiplatelet effects may increase bleeding risk.

    → Use with caution; monitor for signs of bleeding.

    MODERATE

  • Clopidogrel· blood_thinner

    Possible additive inhibition of platelet aggregation.

    → Avoid combination unless under medical supervision.

    MODERATE

  • Phenothiazines (e.g., chlorpromazine)· antipsychotic

    EPO may lower seizure threshold in susceptible individuals.

    → Use with caution in patients with seizure disorders.

    LOW

  • NSAIDs (e.g., ibuprofen)· nsaid

    Additive anti-inflammatory effects; no significant adverse interaction reported.

    → Generally safe; monitor for stomach upset.

    LOW

This page is a reference summary, not a prescription. Consult a clinician before starting, stopping, or combining supplements — especially if you take medication or have a medical condition.