Do menopause supplements work? An evidence guide

For hot flashes and night sweats, the honest answer is mostly no. The best-designed trials and the 2023 Menopause Society position statement find that herbal and dietary supplements do not reliably beat placebo. A few nutrients matter for midlife health in other ways, and a few botanicals have small, early signals for sleep or stress, but none is a substitute for proven treatment.

What “menopause supplements” are

The category covers three different things sold under one label. First, botanicals marketed for hot flashes: black cohosh, soy isoflavones, red clover, dong quai, evening primrose, wild yam. Second, nutrients that midlife women are often told to take: vitamin D, calcium, magnesium, omega-3. Third, blends that combine several of these with vitamins and sometimes undisclosed amounts of each.

In the United States these are regulated as foods under the Dietary Supplement Health and Education Act of 1994 (DSHEA). The FDA does not approve them before sale and does not evaluate whether they work. Companies may make “supports” claims as long as the label carries the disclaimer that the statement has not been evaluated by the FDA.

Why women in midlife take them

Hot flashes, broken sleep, mood swings and brain fog are common during the transition described in What is perimenopause?. Many women want to avoid hormones, cannot take them, or have been told by a clinician that nothing can be done. Supplements feel low-risk and are easy to buy. Surveys cited in the 2016 JAMA meta-analysis suggest 40 to 50 percent of women in Western countries use complementary therapies for menopausal symptoms.

What the evidence shows

The expert consensus. The Menopause Society reviewed the literature in five categories and graded recommendations by evidence level. Recommended for hot flashes: cognitive behavioral therapy, clinical hypnosis, SSRIs and SNRIs, gabapentin, fezolinetant (all Level I), oxybutynin, weight loss and stellate ganglion block. Not recommended: supplements and herbal remedies (Levels I–II), soy foods and soy extracts, the soy metabolite equol, cannabinoids, acupuncture (Level II). Hormone therapy remains the most effective treatment and is considered reasonable for women within 10 years of their final period who have no contraindications.

Black cohosh. The 2012 Cochrane review pooled 16 randomized trials with 2,027 perimenopausal and postmenopausal women taking a median of 40 mg per day for a mean of 23 weeks. Black cohosh did not differ from placebo in hot flash frequency (mean difference 0.07 flashes per day) or in symptom scores. Hormone therapy outperformed black cohosh. Trial quality was generally unclear because of poor reporting. Our black cohosh guide covers the trials in detail.

Soy and other phytoestrogens. The 2016 JAMA meta-analysis of 62 trials and 6,653 women found that phytoestrogens were associated with about 1.3 fewer daily hot flashes than control and a small improvement in vaginal dryness scores, with no effect on night sweats. Soy isoflavones specifically were associated with 0.79 fewer hot flashes per day. The authors flagged that 74 percent of trials had a high risk of bias in three or more domains, which is why the Menopause Society does not recommend soy extracts. A 2013 Cochrane review of 43 trials (4,364 women) found most trials too dissimilar to pool; where red clover extract trials could be combined, the difference from placebo was not statistically significant.

Head-to-head with hormone therapy. The year-long HALT trial randomized 351 women aged 45 to 55 to black cohosh 160 mg, a multibotanical blend, the blend plus soy counseling, estrogen therapy, or placebo. None of the herbal arms differed from placebo at 3, 6 or 12 months. Estrogen reduced hot flashes by about 4 per day relative to placebo. At 12 months, the blend-plus-soy group actually had worse symptom intensity than placebo.

Omega-3. In the MsFLASH trial, 355 women took 1.8 g per day of omega-3 or placebo for 12 weeks. Hot flashes fell by 2.5 per day with omega-3 and 2.7 per day with placebo; sleep and mood did not improve either. Our omega-3 guide covers the heart-health evidence, which is a different story.

Everything else. NCCIH summarizes the rest: flaxseed no better than placebo for hot flashes, dong quai barely studied and a possible interaction with blood thinners, vitamin E associated with about one fewer hot flash per day in a small body of research, and insufficient evidence for evening primrose oil, ginseng, wild yam and melatonin. Kava has been linked to severe liver disease.

The large placebo response is the key to reading all of this. Hot flashes wax and wane, attention from a trial team helps, and women enter studies when symptoms are at their worst. A product that “works” in daily life may be riding the same curve the placebo group rides.

What supplements can legitimately do

The strongest cases are nutritional rather than symptomatic. Vitamin D and calcium matter for bone when dietary intake is low, though large trials of supplementation in people who are not deficient have not reduced fractures; see our vitamin D guide. Omega-3 from seafood is associated with heart health, and supplementation modestly lowers triglycerides. Creatine has reasonable evidence for muscle and strength when paired with resistance training; see our creatine guide. Ashwagandha and magnesium glycinate have small, short trials for sleep and stress.

Safety and interactions

Short trials report low rates of side effects for most botanicals, but long-term data are rare. Liver injury has been reported with black cohosh, ashwagandha and kava. Products marketed for weight loss and energy are the most likely to contain undeclared drugs. If you take hormone therapy, an SSRI or SNRI, thyroid medication or an anticoagulant, assume an interaction is possible until a pharmacist or clinician tells you otherwise, because most supplement–drug combinations have never been studied.

How to choose, if you choose

Prefer single-ingredient products over proprietary blends, so you know the dose. Look for a third-party certification mark such as USP Verified or NSF, which confirms contents and contaminant limits but says nothing about effectiveness; our third-party testing guide explains the marks. Read the Supplement Facts panel for the actual amount of the active ingredient, not the total weight of a blend. Set a trial period of 8 to 12 weeks, track symptoms with the symptom check, and stop if nothing has changed.

Bottom line

Supplements marketed for menopause have not beaten placebo in the best trials, and the main US professional society does not recommend them for hot flashes. If symptoms are affecting your sleep, work or relationships, the evidence-based options are hormone therapy and several nonhormonal prescriptions, delivered by someone who treats menopause regularly. Our guide on how to find a menopause specialist and the clinician finder can help.