Experiencing night sweats can be a disruptive aspect of the menopause transition, affecting sleep quality and overall well-being. Many women seek non-pharmacological options to help manage these experiences.
Evening primrose oil (EPO) is a popular supplement often considered for various midlife discomforts. This article will carefully review the available research on whether evening primrose oil might assist with menopause-related night sweats, focusing only on the evidence currently at hand.
Understanding Menopause Night Sweats
Night sweats are a form of vasomotor symptom, similar to hot flashes, but occurring during sleep. They can range from mild warmth to profuse sweating that disrupts sleep and requires changing bedding or clothing. The exact mechanisms behind night sweats are complex and thought to involve fluctuations in hormone levels affecting the body’s temperature regulation center.
Managing night sweats often involves a combination of lifestyle adjustments, such as maintaining a cool bedroom environment, wearing breathable sleepwear, and avoiding triggers like spicy foods or caffeine before bed. For some, exploring dietary supplements is also a consideration.
What is Evening Primrose Oil?
Evening primrose oil 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 that the body converts into other compounds, including prostaglandins, which play a role in various bodily functions.
Due to its GLA content, evening primrose oil has been studied for its potential effects on various inflammatory conditions and hormone-related symptoms. It is often marketed as a supplement for skin health, premenstrual syndrome (PMS), and menopausal symptoms like hot flashes and night sweats.
The Current Evidence on Evening Primrose Oil and Night Sweats
The scientific evidence specifically addressing evening primrose oil’s effectiveness for reducing menopause night sweats is thin — but it is not absent, and it does not point the same way as the evidence on hot flashes. Two randomised trials have reported a night-time-specific signal, and one of them measured night sweats as an outcome in their own right [5][6]. Both are set out below, because a page asking this question should answer it from the trials that measured it rather than from trials that measured something adjacent.
A systematic review and meta-analysis published in 2024 examined evening primrose oil for menopause hot flashes. This review indicated that the evidence supporting the use of evening primrose oil for hot flashes is limited [1]. It is tempting to carry that conclusion straight across to night sweats on the grounds that night sweats are hot flashes that happen during sleep — but the one trial that measured both endpoints in the same women found that they came apart. In a single-blind randomised controlled trial, 1,000 mg of evening primrose oil twice daily for eight weeks left hot flash frequency, duration and severity no different from the control group, while the treatment group reported significantly lower night sweat frequency and severity (P < 0.05) [5]. Whatever the hot-flash literature shows, it cannot be used to settle the night-sweat question by inference.
Another systematic review and meta-analysis from 2025 also looked at the effect of evening primrose oil on menopausal symptoms management. This review concluded that the current evidence is insufficient to definitively recommend evening primrose oil for managing menopausal symptoms [2]. This further underscores the need for more targeted research.
An earlier review from 2004 discussing nonestrogen treatment modalities for vasomotor symptoms noted that evidence for evening primrose oil’s effectiveness in this area was not strong [3]. That review predates the only trial to measure night sweats separately, so it describes the hot-flash picture rather than a settled position on night sweats. The older double-blind trial is worth reading the same way: over six months it found no overall benefit for gamolenic acid from evening primrose oil on menopausal flushing, and the placebo arm improved significantly — yet the one outcome that did improve significantly within the treatment arm was a reduction in the maximum number of night-time flushes [6]. Two trials, two night-time signals, and neither designed to confirm one.
A 2024 systematic review focused on the effect of Oenothera biennis (Evening primrose) oil on inflammatory diseases. While this review did not specifically focus on menopausal night sweats, it highlights the broader range of conditions for which EPO has been investigated, without providing direct evidence for night sweats [4].
Interpreting the Findings: What Does ‘Limited Evidence’ Mean?
When evidence is described as ‘limited,’ it means that while some studies may exist, they might be small, not well-controlled, or produce inconsistent results. It does not necessarily mean evening primrose oil is ineffective, but rather that there isn’t enough high-quality research to draw firm conclusions or make strong recommendations.
For women considering evening primrose oil for night sweats, the honest position is narrower than ‘no evidence’ and weaker than a recommendation. The endpoint has been measured, once, with a positive result — but that trial was single-blind rather than double-blind, which is exactly the design weakness that inflates an apparent benefit, and no one has replicated it. Placebo response in vasomotor symptom trials is large, and the 1994 trial is the direct demonstration: its placebo arm improved significantly [6]. So the case for night sweats is suggestive and unreplicated, not established — and it is still stronger than the case for hot flashes, which controlled trials have repeatedly failed to support.
Considerations for Using Evening Primrose Oil
If you are considering evening primrose oil, it is generally considered safe for most people when taken at recommended doses. However, like any supplement, it can have potential interactions or side effects. These can include mild gastrointestinal upset, headaches, or rarely, allergic reactions.
It’s always advisable to discuss any new supplement with a healthcare provider, especially if you are taking other medications or have underlying health conditions. They can offer personalized guidance based on your individual health profile and help you weigh the potential benefits against any risks.
References
- Evening Primrose Oil for Menopause Hot Flashes: Systematic Review and Meta-Analysis. Journal of menopausal medicine, 2024
- The Effect of Evening Primrose Oil on Menopausal Symptoms Management: A Systematic Review and Meta-Analysis. Journal of caring sciences, 2025
- Nonestrogen treatment modalities for vasomotor symptoms associated with menopause. The Annals of pharmacotherapy, 2004
- The effect of Oenothera biennis (Evening primrose) oil on inflammatory diseases: a systematic review of clinical trials. BMC complementary medicine and therapies, 2024
- The Effect of Evening Primrose Oil Capsule on Hot Flashes and Night Sweats in Postmenopausal Women: A Single-Blind Randomized Controlled Trial. Journal of menopausal medicine, 2021
- Effect of oral gamolenic acid from evening primrose oil on menopausal flushing. BMJ (Clinical research ed.), 1994
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.
