--- title: Vitamin E and Evening Primrose Oil: Does It Help PMS? description: Vitamin E and evening primrose oil are often combined for PMS symptoms. Here is what the trials found on effectiveness, dosing, side effects, and safety. url: https://niyora.com/treatments/vitamin-e/ --- - [Niyora](https://niyora.com/) - [Treatments](https://niyora.com/treatments/) - Vitamin E and evening primrose oil for PMS: what the trials found Treatment # Vitamin E and evening primrose oil for PMS: what the trials found Vitamin E and evening primrose oil are often paired in supplements for PMS, but the research on how well that combination works is mixed. Trials show mixed, mostly weak benefits for premenstrual symptoms overall. One small six-month trial hinted at a benefit for breast pain, but its direct comparison against placebo wasn't statistically significant. Neither has been tested in diagnosed PMDD. Updated 14 October 2026 Niyora editorial Mixed evidence Strength of evidence Mixed Trials disagree, or the effect is small. - None - Limited - Mixed - Moderate - Strong ## At a glance - Vitamin E and evening primrose oil (EPO) are different substances, often combined in one capsule, though most trials tested them separately. - For overall PMS symptoms, results are inconsistent: several well-controlled trials found no benefit over placebo, while a few newer ones found real improvement. - The clearest evidence is for breast pain (cyclical mastalgia): a six-month RCT found all three groups improved more on a within-group analysis than placebo did, though the direct comparison against placebo did not reach statistical significance (EPO p=0.18, vitamin E p=0.10, combination p=0.16) ( [1]). - Neither has been tested in diagnosed PMDD using DSM-5-TR criteria. Current PMDD treatment guidance points to SSRIs, certain hormonal contraceptives, or CBT instead. - Trial doses were vitamin E 1,200 IU a day and EPO around 2,000 to 3,000 mg a day ([1], [7]), taken for months, not days, before an effect showed up. ## Strength of evidence Mixed evidence - None - Limited - Mixed - Moderate - Strong Trials on evening primrose oil and vitamin E for PMS disagree: several placebo-controlled studies found no benefit, a few newer ones found real improvement, and one RCT found a modest effect on breast pain. None studied PMDD using diagnostic criteria. ## What is vitamin E, and is it the same as evening primrose oil? Vitamin E is a fat-soluble vitamin your body uses as an antioxidant, found in foods like nuts, seeds, and vegetable oils. Evening primrose oil (EPO) is pressed from the seeds of the evening primrose plant and contains gamma-linolenic acid, an omega-6 fatty acid your body uses to make certain hormone-like compounds ( [8]). They're two different substances, not two names for the same thing. Supplement makers often combine them in one capsule. Some skin lotions pair vitamin E with evening primrose oil too, as a moisturizer rather than a PMS treatment. If you've come across a vitamin E body lotion with evening primrose oil, that's a skincare product studied for skin hydration, not premenstrual symptoms. Everything below is about oral capsules, not creams. - Vitamin E: an antioxidant vitamin, sold alone or in combination products. - Evening primrose oil (EPO): rich in gamma-linolenic acid, sold as capsules or blended into creams. - Combination products: capsules pairing vitamin E, EPO, and sometimes vitamin B6, often marketed specifically for PMS. ## Does vitamin E or evening primrose oil help PMS or PMDD? The research is mixed, and it depends which symptoms you mean. For overall [PMS symptoms](https://niyora.com/premenstrual-syndrome/), mood swings, bloating, irritability, and breast tenderness together, results across trials are inconsistent. A 1996 review of the best-controlled evening primrose oil trials found no real benefit over placebo ( [5]), and a 1990 crossover trial concluded the improvement women felt was a placebo effect ( [6]). A 2024 systematic review of evening primrose oil's effects across many conditions again found no clear benefit for PMS ( [3]). Other trials found more promise. A 2019 trial of 120 women found evening primrose oil reduced PMS severity scores more than placebo ( [7]). A 2024 real-world study of 510 women taking evening primrose oil combined with a vitamin E compound and vitamin B6 found a large drop in symptom scores over three months. It had no placebo group to compare against, so part of that improvement may reflect simply tracking symptoms daily ( [2]). For breast pain specifically, cyclical mastalgia, a six-month RCT found all three groups improved more on a within-group analysis than placebo did, though the direct comparison of each treatment against placebo did not reach statistical significance (EPO p=0.18, vitamin E p=0.10, combination p=0.16) ( [1]). None of these trials diagnosed PMDD using DSM-5-TR criteria; they all studied PMS. For PMDD, [current treatment guidance](https://niyora.com/treatments/pms-treatment/) points to SSRIs, certain hormonal contraceptives, or CBT, decided with a doctor, not supplements. ## How much should you take? The trials above didn't all use the same dose, and none of them tell you what's right for your body. These are the doses used in research, not a recommendation to follow without guidance. - Vitamin E: 1,200 IU a day, taken for six months in the breast pain trial ( [1]). - Evening primrose oil: 3,000 mg a day in the same trial ( [1]), or 1,000 mg twice daily (2,000 mg total) in a separate PMS trial ( [7]). - Combination products: doses vary by brand; follow the label or ask a pharmacist. One review notes that EPO needs months, not days, before you can judge whether it's doing anything, suggesting four to six months before deciding ( [8]). A doctor or pharmacist can help you choose a dose and check it fits your health history. Note Niyora is a PMS and PMDD support app. While you wait months to see if a supplement is doing anything, Niyora's Moon can help you write down what happened in a hard moment, see it from another angle, and calm down before you decide what to say. ## What are the side effects? Across the trials, vitamin E and evening primrose oil were generally well tolerated. The most commonly reported complaints were mild: - Stomach upset or nausea - Headache - Occasional loose stools Serious reactions at these doses were uncommon in the trials reviewed here. One six-month breast pain trial had a high dropout rate (85 enrolled, 41 completed), though the published report doesn't say how many of those dropouts were due to side effects rather than the length of the study ( [1]). Evening primrose oil's active ingredient, gamma-linolenic acid, is generally considered safe for months of use, though data beyond the length of these trials, around six months, is limited. If you start either supplement and notice new or worsening symptoms, stop and tell your doctor or pharmacist. ## Is it safe with other medications? Vitamin E and evening primrose oil aren't inert, so it's worth checking before you combine them with other medications. Vitamin E at higher doses can increase bleeding risk, which matters if you take a blood thinner like warfarin, or regular aspirin. Evening primrose oil is sometimes flagged for the same reason, and for possible interactions with anti-seizure medication. None of the trials above tested these supplements against specific drug interactions, so the safest step is to tell your doctor or pharmacist about every supplement you take, not just prescription medication. This matters more if you have a bleeding disorder, are on blood thinners, or have surgery planned. If you're pregnant, one trial tested evening primrose oil in the final week before labor to see if it shortened things; it found no difference in labor duration or outcomes compared with placebo ( [4]). Still, check with your doctor before starting any new supplement in pregnancy. ## What does the research say overall? The stronger, better-controlled trials for overall PMS symptoms tend to find no real benefit beyond placebo. A handful of newer, less controlled studies report improvement instead. Breast pain has somewhat better support. PMDD hasn't been tested with these supplements using diagnostic criteria at all. | Use | What trials found | Evidence strength | | --- | --- | --- | | PMS symptoms overall | Mixed: 1990 and 1996 placebo-controlled trials and a 2024 systematic review found no benefit; 2019 and 2024 trials found improvement | Mixed | | Breast pain (mastalgia) | One 6-month RCT found all three groups improved more on a within-group analysis than placebo did, but the direct comparison against placebo wasn't statistically significant (EPO p=0.18, vitamin E p=0.10, combination p=0.16) | Limited to moderate | | PMDD specifically | Not studied using DSM-5-TR diagnostic criteria | None | For a closer look at each body of research, see the full reviews of [vitamin E for PMS](https://niyora.com/treatments/vitamin-e-for-pms/) and [vitamin E for PMDD](https://niyora.com/treatments/vitamin-e-for-pmdd/). If you want to know whether what you're feeling fits a PMS or PMDD pattern before you decide on a supplement, a [DRSP chart](https://niyora.com/tools/drsp-chart/) tracking symptoms daily for two cycles is the tool doctors actually use to tell the difference. See a doctor if your symptoms take up a week of every month, or if nothing, including supplements, is helping after a few cycles. Bring two months of daily notes. From the research library ## Research on vitamin E 33 studies in the library look at vitamin E in PMS and PMDD. They were published from 1983 to 2025, and each one has a short summary of what was tested and found. 33 studies, 1983 to 2025 How strong the studies are Strong study design 4 Moderate study design 15 Early or limited evidence 14 - [Randomised trial, 2025Do vitamin D and E supplements reduce menstrual pain and PMS symptoms?Yes, vitamin D and E supplements significantly reduced menstrual pain and PMS symptoms over 4 months, especially in women with low vitamin D levels.Strong study design](https://niyora.com/research/papers/effect-of-vitamin-d-and-e-supplementation-on-pain-relief-and-premenstrual-2025/) - [Cohort study, 2021Are low antioxidant vitamins or high oxidative stress linked to premenstrual syndrome?This study found that oxidative stress markers were linked to more depression and food cravings symptoms and more severe PMS, but antioxidant vitamin levels were mostly not associated with PMS symptoms.Strong study design](https://niyora.com/research/papers/serum-antioxidant-vitamin-concentrations-and-oxidative-stress-markers-associated-2021/) - [Systematic review, 2009Which herbs, vitamins and minerals help treat PMS?Only calcium has good evidence to work for PMS. Chasteberry and vitamin B6 may help, but most of the 62 products people try lack proper research.Strong study design](https://niyora.com/research/papers/herbs-vitamins-and-minerals-in-the-treatment-of-premenstrual-syndrome-a-2009/) - [Randomised trial, 2000Which dietary supplements help PMS?Only calcium has strong evidence from large rigorous trials. Magnesium, vitamin E, and carbohydrate supplements show limited promise but need more research. Vitamin B6 and evening primrose oil have mixed results.Strong study design](https://niyora.com/research/papers/the-potential-for-dietary-supplements-to-reduce-premenstrual-syndrome-pms-2000/) - [Study, 2024Does a combination of evening primrose oil, tocotrienol, and vitamin B6 reduce premenstrual symptoms?Yes. In women with PMS taking this combination for 3 months, premenstrual symptoms improved significantly. The overall PMS score dropped by 61.03%, menstrual pain dropped by 75.20%, and breast tenderness dropped by 82.54%.Moderate study design](https://niyora.com/research/papers/a-real-world-study-to-evaluate-the-effectiveness-of-evening-primrose-oil-in-2024/) - [Randomised trial, 2023Does gamma-tocopherol (a form of vitamin E) reduce premenstrual syndrome symptoms?Yes. Gamma-tocopherol significantly reduced fatigue and anger, and also reduced leg swelling. Because this was a well-designed controlled trial where each woman tried both treatments, we can be fairly confident about these effects.Moderate study design](https://niyora.com/research/papers/effect-of-tocopherol-supplementation-on-premenstrual-symptoms-and-natriuresis-a-2023/) [See all 33 studies on vitamin E](https://niyora.com/research/topics/treatment-vitamin-e/) ## Questions people ask Are vitamin E and evening primrose oil the same thing? + No. Vitamin E is an antioxidant vitamin, while evening primrose oil is pressed from evening primrose seeds and contains gamma-linolenic acid. Supplement brands often combine the two in one capsule, and some skin lotions pair them for moisturizing, not for premenstrual symptoms. Does evening primrose oil help PMS mood symptoms? + Evidence on evening primrose oil for PMS mood symptoms is mixed. Several well-controlled trials from the 1980s and 1990s found no benefit beyond placebo, while a few newer trials report real improvement. A 2024 systematic review found no clear benefit for PMS specifically. Can vitamin E and evening primrose oil help breast pain before my period? + A six-month randomized trial found vitamin E, evening primrose oil, and the combination of both eased worst-pain scores for cyclical breast pain more than placebo, though not every comparison reached statistical significance on its own. The effect looked modest and needs confirming in larger trials. Can I use a vitamin E cream with evening primrose oil for PMS? + A vitamin E cream with evening primrose oil is made for skin hydration, not tested for PMS symptoms. The PMS and breast pain research covered here used oral capsules, not topical products, so a cream isn't a substitute for either. How long does evening primrose oil take to work for PMS? + One review suggests giving evening primrose oil four to six months before judging whether it helps, since the response isn't immediate. If you don't notice a difference after a few cycles of daily use, it may not be working for you. Has vitamin E or evening primrose oil been studied for PMDD? + No trial covered here diagnosed PMDD using DSM-5-TR criteria; they all studied PMS instead. If your pattern fits PMDD, SSRIs, certain hormonal contraceptives, or CBT have stronger evidence behind them, a choice best made with a doctor rather than a supplement label. ## Sources - 1. [Vitamin E and evening primrose oil for management of cyclical mastalgia: a randomized pilot study](https://pubmed.ncbi.nlm.nih.gov/20359269/), Alternative medicine review : a journal of clinical therapeutic, 2010 - 2. [A Real-world Study to Evaluate the Effectiveness of Evening primrose oil in Combination with Tocotrienol and Vitamin B6 in Women with Premenstrual Syndrome: Findings from PRIME study](https://doi.org/10.33545/gynae.2024.v8.i3c.1466), International Journal of Clinical Obstetrics and Gynaecology, 2024 - 3. [The effect of Oenothera biennis (Evening primrose) oil on inflammatory diseases: a systematic review of clinical trials](https://doi.org/10.1186/s12906-024-04378-5), BMC complementary medicine and therapies, 2024 - 4. [Evening primrose oil and labour, is it effective? A randomised clinical trial](https://doi.org/10.1080/01443615.2017.1386165), Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology, 2018 - 5. [Is evening primrose oil of value in the treatment of premenstrual syndrome?](https://doi.org/10.1016/0197-2456(95)00082-8), Controlled clinical trials, 1996 - 6. [Evening primrose oil and treatment of premenstrual syndrome](https://doi.org/10.5694/j.1326-5377.1990.tb136857.x), The Medical journal of Australia, 1990 - 7. [The Effect of Evening Primrose and vitamin B6 on premenstrual syndrome: a randomized clinical trial](https://doi.org/10.22038/ijogi.2019.12660), DOAJ (DOAJ: Directory of Open Access Journals), 2019 - 8. [Evening Primrose ( Oenothera biennis ) Oil in Management of Female Ailments](https://doi.org/10.6118/jmm.18190), Journal of menopausal medicine, 2019 Ask AI about this page Copy prompt ChatGPT ↗ Claude ↗ Perplexity ↗ Google AI Mode ↗ Grok ↗ On this page - [What is vitamin E, and is it the same as evening primrose oil?](#what-is-vitamin-e-and-is-it-the-same-as-evening-primrose-oil) - [Does vitamin E or evening primrose oil help PMS or PMDD?](#does-vitamin-e-or-evening-primrose-oil-help-pms-or-pmdd) - [How much should you take?](#how-much-should-you-take) - [What are the side effects?](#what-are-the-side-effects) - [Is it safe with other medications?](#is-it-safe-with-other-medications) - [What does the research say overall?](#what-does-the-research-say-overall) - [Research](#research) - [Questions](#faq) Niyora PMS & PMDD support For the hard moment before your period. Private, no account. [Get it on iPhone](https://apps.apple.com/app/niyora-pms-emotions/id6764561688) ## Keep reading Treatment Vitamin E for PMS: does it work? Treatment Vitamin E for PMDD: does it work? Treatment PMS treatment: what actually helps Condition What is PMS? Premenstrual syndrome, explained Care guide Finding a PMDD specialist Guide All 26 research findings