Navigating the changes of midlife and menopause often brings new experiences, and for many women, hot flashes are a common concern. As individuals seek ways to support their well-being during this transition, interest in complementary approaches like evening primrose oil and red clover has grown.
This article explores what is currently understood about evening primrose oil and red clover in relation to managing hot flashes. We aim to provide clear, evidence-based information to help you understand these options better, always with a focus on careful and balanced perspectives.
Understanding Hot Flashes During Menopause
Hot flashes are sudden feelings of warmth, often intense, that spread over the body and are frequently accompanied by sweating and flushing. They are a hallmark symptom for many women experiencing perimenopause and menopause, and their frequency and intensity can vary significantly from person to person. While the exact mechanism isn’t fully understood, hot flashes are thought to be related to hormonal fluctuations, particularly declining estrogen levels, which affect the body’s temperature regulation center in the brain.
The experience of hot flashes can range from mild and infrequent to severe and disruptive, impacting daily life, sleep quality, and overall comfort. Many women actively seek strategies to help manage these sensations and improve their quality of life during this natural life stage.
Evening Primrose Oil: A Closer Look
Evening primrose oil (EPO) is derived from the seeds of the evening primrose plant (Oenothera biennis). It is a rich source of gamma-linolenic acid (GLA), an omega-6 fatty acid. GLA is an essential fatty acid, meaning the body cannot produce it on its own and must obtain it through diet or supplements. EPO has been traditionally used for various health purposes, and its potential role in supporting women’s health during menopause is an area of ongoing interest.
Regarding hot flashes, evening primrose oil has been tested in randomised trials and the pooled results are largely null. A 2025 systematic review and meta-analysis of six randomised controlled trials covering 450 women found the EPO group averaged 2.13 fewer hot flashes per day than controls, but that difference was not statistically significant, and a 0.19 reduction in hot flash intensity was also not statistically significant; only the duration of hot flashes was significantly reduced, on evidence graded moderate to low [1]. A separate 2024 systematic review and meta-analysis reported lower hot flash severity when EPO was taken for less than six months, but no significant difference in the frequency or duration of hot flashes, and concluded that the current evidence is insufficient to draw firm conclusions [2]. It’s important to approach these claims with a balanced perspective, recognizing that individual experiences can differ from what is observed in broader studies.
Red Clover: What the Research Indicates
Red clover (Trifolium pratense) is a flowering plant that contains isoflavones, which are plant compounds with a structure similar to estrogen. Because of this structural similarity, red clover isoflavones are sometimes referred to as phytoestrogens. This has led to interest in red clover as a potential natural support for menopausal symptoms, including hot flashes, given the role of estrogen decline in their occurrence.
Red clover has its own randomised evidence, and on this particular symptom it is stronger than the evidence for evening primrose oil. A 2026 GRADE-assessed systematic review and meta-analysis of nine randomised controlled trials, using daily isoflavone doses of 37.1 to 160 mg over treatment periods of 12 weeks to 12 months, found a statistically significant reduction in hot flash frequency compared with placebo (standardised mean difference -0.446, 95% confidence interval -0.807 to -0.084, p = 0.016), a small-to-moderate effect, with no publication bias detected [3]. An earlier 2016 systematic review and meta-analysis found a reduction in hot flash frequency that fell just short of significance (mean difference -1.99, p = 0.067), alongside significant improvement in vaginal dryness at an 80 mg dose [4]. It’s essential to consider that the concentration and type of isoflavones can vary in different red clover preparations, which might influence their effects.
Comparing Evening Primrose Oil and Red Clover for Hot Flashes
When comparing evening primrose oil and red clover for hot flashes, it’s important to recognize that they are not backed to the same degree: red clover has a pooled randomised result for hot flash frequency that reaches statistical significance, and evening primrose oil does not. Evening primrose oil’s potential benefits are often attributed to its GLA content, which may play a role in modulating inflammatory pathways, while red clover’s interest stems from its phytoestrogen content, which could theoretically interact with estrogen receptors.
Both supplements are generally considered to have a good safety profile for most individuals when used appropriately, but potential interactions or side effects should always be considered. The choice between them, or whether to use either, often comes down to individual preference, personal experience, and discussions with a healthcare provider. It’s crucial not to view either as a guaranteed solution but rather as potential complementary approaches that may work for some individuals.
No randomised trial has tested evening primrose oil against red clover head to head, so any ranking between the two is inference drawn from separate placebo-controlled studies rather than a measured result. Read on that separate evidence, the honest summary is that red clover’s pooled effect on hot flash frequency reaches statistical significance while evening primrose oil’s does not. That is a difference in the strength of the evidence, not proof that either will work better for any individual woman. The effectiveness of any supplement can be highly individual, influenced by factors such as genetics, overall health, and the specific formulation and dosage used.
Safety Considerations and Important Cautions
While evening primrose oil and red clover are often perceived as ‘natural,’ it’s vital to remember that they can still have effects on the body and may interact with medications or existing health conditions. For evening primrose oil, common side effects are usually mild and may include digestive upset. For red clover, potential side effects can also include mild digestive issues, and due to its phytoestrogen content, it should be used with caution by individuals with hormone-sensitive conditions or those taking hormone-related medications.
Always discuss any new supplements with your healthcare provider, especially if you have pre-existing health conditions, are taking other medications, or are pregnant or breastfeeding. This step is crucial to ensure that any supplement you consider is appropriate and safe for your individual circumstances. Your healthcare provider can offer personalized guidance based on your medical history and current health needs.
References
- The Effect of Evening Primrose Oil on Menopausal Symptoms Management: A Systematic Review and Meta-Analysis. Journal of caring sciences, 2025
- Evening Primrose Oil for Menopause Hot Flashes: Systematic Review and Meta-Analysis. Journal of menopausal medicine, 2024
- The effectiveness of red clover on hot-flash in menopausal women: a GRADE-assessed systematic review and meta-analysis. European journal of obstetrics, gynecology, and reproductive biology, 2026
- Red clover for treatment of hot flashes and menopausal symptoms: A systematic review and meta-analysis. Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology, 2016
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.
