Evening Primrose Oil

Evening primrose oil contains gamma-linolenic acid (GLA). It is traditionally used with the idea of improving cervical mucus, but there is very little good research showing that it does so or that it improves fertility. Because of possible effects on the uterus, it is generally avoided in pregnancy.

People who have discussed it with a clinician. There is no strong evidence that it is needed. Whether it suits you depends on your health, medicines and test results — ask a clinician.

Traditional use has been about 1,500–3,000 mg daily in the first half of the cycle. This is not a recommendation. Doses vary by product and person; this is not personal medical advice.

Traditional advice suggests trying it for one to two cycles; benefits are not proven.

Stomach upset, headache and nausea. People with seizure disorders should ask a doctor first.

Stop if you may be pregnant. Do not use during IVF or fertility treatment unless your specialist agrees.

Evidence level (our editorial summary, not a formal grading): Limited (traditional use).

Pregnancy & breastfeeding: Generally avoided in pregnancy unless a clinician advises otherwise; stop if you may be pregnant.

Medication interactions: May interact with blood thinners and some psychiatric medicines (such as phenothiazines).

Talk to a healthcare professional before use if you are pregnant, breastfeeding, planning pregnancy, have a medical condition, take any medicine, or are scheduled for surgery. Dietary supplements are not approved by the FDA for safety or effectiveness before they are sold, and quality varies between products.

Reliable sources to check: NIH Office of Dietary Supplements fact sheets · NCCIH Herbs at a Glance · MedlinePlus Herbs & Supplements · FDA — Dietary Supplements