EPO · Oenothera biennis · Primrose Oil
1,000 mg · gluten-free · 60 caps
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Evening primrose oil (EPO) is extracted from the seeds of Oenothera biennis and is rich in gamma-linolenic acid (GLA, 7–14%), an omega-6 fatty acid with prostaglandin-like effects. It is used orally or vaginally in the last weeks of pregnancy to promote cervical ripening.
GLA is metabolized to dihomo-gamma-linolenic acid (DGLA), a precursor to series-1 prostaglandins (PGE1) that promote cervical softening and uterine contractility. Some studies suggest EPO improves Bishop score (a measure of cervical readiness), though meta-analyses are conflicting on whether this translates to shorter labor or reduced cesarean rates.
Pregnant women at 37+ weeks gestation with an unfavorable cervix or post-term risk who want a natural adjunct to cervical ripening alongside standard obstetric care.
Do not use before 37 weeks due to risk of preterm labor. Avoid if you have a history of preterm birth, placenta previa, or are scheduled for elective cesarean. Discontinue if contractions become regular before term.
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✓ Split dosing maintains steady GLA levels
✓ Split dosing maintains steady GLA levels
✓ Take with meals to reduce GI upset and improve fatty acid absorption
GLA is metabolized to dihomo-gamma-linolenic acid (DGLA), a precursor to series-1 prostaglandins (PGE1) that promote cervical softening and uterine contractility.
Each bar = one cited trial. Effect varies by methodology, dose, and population.
Representative cohort from published RCT data
Relative to baseline (100). Data from published clinical literature.
7 RCTs, 920 women
→ EPO significantly improved Bishop score (MD = 3.23) compared to placebo. Both oral and vaginal routes increased Bishop score. No significant difference in 1-min Apgar or second-stage labor length, but 5-min Apgar scores were better in the EPO group
6 RCTs
→ Meta-analysis found no significant difference in Bishop score change between EPO and control (SMD: 0.27, 95%CI: -0.41, 0.96, p = 0.43). High heterogeneity (I² = 91.4%) limited definitive conclusions
9 RCTs
→ Significant differences in Bishop score (MD=1.32), reduced cesarean section rate (OR=0.61), and shortened first-stage (MD=-98.67 min) and second-stage labor (MD=-10.98 min) versus control. High heterogeneity noted
B · Conflicting meta-analyses—one positive for Bishop score and cesarean reduction, one negative due to high heterogeneity. EPO improves cervical readiness markers but labor outcome benefits are inconsistent. Safety profile is reassuring when used after 37 weeks
A plain-English read of the literature behind this supplement. Not a clinical recommendation.
Key citations: Abenavoli 2010 (hepatoprotection systematic review), Cacciapuoti 2013 (NAFLD RCT). richResearch section contains study filters.
How to use Evening Primrose Oil (Cervical) specifically for Post term pregnancy — the right dose, timing, blood markers to track, and how to know if it is working.
A clinical evidence review of Evening Primrose Oil (Cervical) — RCT data, effect sizes, evidence grade, and what the numbers mean for your specific situation.
Everything you need to know about Evening Primrose Oil (Cervical) — mechanism, dose, safety, buying guide for India, and what the research actually says.
SacredBod's longer take on Evening Primrose Oil (Cervical) — context the structured blocks above don't capture.
Evening primrose oil (EPO) is extracted from the seeds of Oenothera biennis and is rich in gamma-linolenic acid (GLA, 7–14%), an omega-6 fatty acid with prostaglandin-like effects. It is used orally or vaginally in the last weeks of pregnancy to promote cervical ripening.
GLA is metabolized to dihomo-gamma-linolenic acid (DGLA), a precursor to series-1 prostaglandins (PGE1) that promote cervical softening and uterine contractility. Some studies suggest EPO improves Bishop score (a measure of cervical readiness), though meta-analyses are conflicting on whether this translates to shorter labor or reduced cesarean rates.
Who benefits most
Pregnant women at 37+ weeks gestation with an unfavorable cervix or post-term risk who want a natural adjunct to cervical ripening alongside standard obstetric care.
Dosage and form
1,000 mg is the typical effective range. Forms matter: choose standardised extracts or highly bioavailable delivery formats (see the Forms tab). Take as directed.
Side effects and cautions
Use only in last 4 weeks under OB supervision. Avoid if you: Do not use before 37 weeks due to risk of preterm labor. Avoid if you have a history of preterm birth, placenta previa, or are scheduled for elective cesarean. Discontinue if contractions become regular before term..
The evidence
Human clinical trials and mechanistic research support the use of Evening Primrose Oil (Cervical) for its primary indication. See the Research tab for full citations and study summaries.
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