Safety Profile
Overall safety rating: Generally Safe
Evening Primrose Oil Side Effects & Safety
This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer
Potential Side Effects
- Mild GI symptoms — nausea, soft stools, or stomach upset (most common)
- Headache (occasional, usually transient)
- Rare: may lower seizure threshold in susceptible individuals
Drug & Supplement Interactions
- Blood thinners (warfarin, aspirin) — GLA may have mild antiplatelet effects; monitor for increased bleeding
- Anticonvulsants — EPO may theoretically lower seizure threshold; use with caution in epilepsy
- NSAIDs — additive anti-inflammatory effects; generally not harmful but monitor GI symptoms
Maximum Dose
Do not exceed: 6g daily has been used in some studies; 3-4g is the standard therapeutic range
References
- Pruthi S, Wahner-Roedler DL, Torkelson CJ, et al. (2010). Vitamin E and evening primrose oil for management of cyclical mastalgia: a randomized pilot study. Alternative Medicine Review. PubMed
- Budeiri D, Li Wan Po A, Dornan JC (1996). Is evening primrose oil of value in the treatment of premenstrual syndrome?. Controlled Clinical Trials. DOI PubMed