Menopause Supplements: What the Evidence Actually Shows

The menopause aisle has expanded since the last time you walked past it. There are gummies in pastel packaging, capsules that promise “hormone balance,” tinctures for “inner calm,” and blends whose ingredient lists read like a botanical garden tour. They are not cheap, and the labels are confident. The trials behind them are less so.

The plain version: most menopause supplements have limited evidence from small or mixed-quality trials. Black cohosh and soy isoflavones have been studied the most, with some trials showing modest relief for hot flashes and others showing no difference from placebo. Evening primrose oil, red clover, dong quai and most proprietary blends have weaker or negative results. No supplement has evidence comparable to hormone therapy or evidence-based non-hormonal prescriptions. NICE guidelines recommend that healthcare professionals do not suggest complementary therapies as treatment for menopausal symptoms due to insufficient evidence [3]. If you choose to try one, discuss it with a clinician first.

What’s going on

Supplements exist in a regulatory space that is different from prescription medicines. In the US, the FDA regulates dietary supplements under the Dietary Supplement Health and Education Act, which means manufacturers are responsible for the safety of their products but do not need to prove they work before selling them [6]. A supplement can be marketed for “menopause support” without a single trial in menopausal people. The label cannot legally claim to treat a disease, but it can say things like “supports hormonal balance” or “promotes comfort during the change,” which sound like the same promise in softer clothing.

This does not mean all supplements are useless. It means the question “does this work?” needs to be answered by the published research, not by the packaging. Here is what that research says about the most commonly sold options.

Black cohosh

Black cohosh (Actaea racemosa) is the most studied herbal supplement for menopausal symptoms, particularly hot flashes. It has been used for decades, and the research base includes a Cochrane review of 16 randomized controlled trials [1].

The Cochrane review concluded that there was insufficient evidence to support black cohosh for menopausal symptoms. Some individual trials showed benefit; others did not. The preparations varied between trials (different extracts, different doses, different formulations), which makes pooling the results harder. A proprietary extract called Remifemin has the most consistent positive individual trials, but even there the effects are modest and the trials are mostly small.

Safety: short-term use appears well tolerated in most trials. Rare cases of liver injury have been reported, leading regulatory agencies in several countries to add liver warnings. People with liver disease, heavy alcohol use or medicines that affect the liver should discuss it with a clinician.

How strong is the evidence? Mixed. There are more trials than for any other menopause supplement, and the answer is still not clear. If it helps, the effect is probably modest. If you try it, buy a product with a standardized extract and tell your clinician.

Soy isoflavones

Soy isoflavones are phytoestrogens, plant compounds with a weak estrogen-like structure. They are available as supplements and also present in soy foods (tofu, edamame, soy milk). The question is whether concentrated isoflavone supplements reduce hot flashes.

A meta-analysis of 19 trials involving 1,422 women found that soy isoflavone supplements reduced hot flash frequency by about 20% and severity by about 26% compared with placebo [2]. Those numbers are modest, and the confidence intervals were wide in some studies. A Cochrane review of phytoestrogens more broadly found no conclusive evidence for efficacy, though it noted that some soy extracts showed more promise than others [7]. A systematic review from the Agency for Healthcare Research and Quality rated the strength of evidence for phytoestrogens and hot flashes as low [5].

Soy foods in the diet are generally considered safe. Concentrated isoflavone supplements are more complicated for people with a history of estrogen-receptor-positive breast cancer; guidance varies, and a conversation with an oncologist is appropriate.

How strong is the evidence? Low to moderate. The most positive meta-analysis shows a modest effect. Others are less convinced. Eating soy foods is a reasonable dietary choice. Taking high-dose isoflavone capsules specifically to treat hot flashes is a step that should be discussed with a clinician, especially with a cancer history.

Red clover

Red clover (Trifolium pratense) contains isoflavones similar to those in soy. It has been studied in several small trials for hot flashes, with inconsistent results. The Cochrane review of phytoestrogens found no clear evidence that red clover supplements reduced hot flashes [7]. Some individual trials reported small benefits, but the trial quality and sample sizes were often limited.

How strong is the evidence? Weak. The trials are small and the results are mixed. Red clover is not recommended in current clinical guidelines for menopausal symptoms.

Evening primrose oil

Evening primrose oil contains gamma-linolenic acid and has been marketed for hot flashes for years. The published trials are few, small and largely negative. A randomized trial of 56 women found no significant difference between evening primrose oil and placebo for hot flash severity or frequency.

How strong is the evidence? Very weak. There is no meaningful body of evidence supporting evening primrose oil for menopausal symptoms. It is one of the most common supplements in the aisle and one of the least supported.

Dong quai

Dong quai (Angelica sinensis) is a traditional Chinese herbal medicine sometimes marketed for hot flashes. A randomized trial of 71 postmenopausal women found no difference between dong quai and placebo for hot flashes, endometrial thickness or vaginal maturation. Dong quai can interact with blood thinners and may increase photosensitivity.

How strong is the evidence? Very weak. The single well-designed trial was negative. It should not be taken with anticoagulants without medical advice.

Proprietary blends and “menopause formulas”

Many products combine several of the above ingredients, sometimes with vitamins, ashwagandha, maca or other botanicals, into a single capsule or gummy. The problem with blends is that the doses of individual ingredients are often unclear, the combinations have rarely been tested as a unit, and the label language (“supports your body through the change”) substitutes mood for evidence.

A product that contains five ingredients at unknown doses is not five times as likely to work. It is a product that has not been tested. If one of the ingredients had strong evidence on its own, you would get a clearer dose by taking it alone.

What the guidelines say

NICE guideline NG23 recommends that healthcare professionals do not suggest complementary therapies, including herbal preparations, for menopausal symptoms due to insufficient evidence of effectiveness and uncertain safety and interactions [3]. The Menopause Society 2022 position statement notes limited evidence for most botanicals and does not recommend them as first-line treatments [4].

This does not make it illegal or foolish to try a supplement. It means that the professional bodies reviewing the evidence have concluded it is not strong enough to recommend. If your symptoms are bothering you enough to spend money on relief, it is worth knowing that evidence-based options exist, both hormonal and non-hormonal, and they have been tested in larger, better-designed trials than any supplement on the shelf.

Is it the change, or something else?

Pattern	Could fit the transition	Other contributors	Needs prompt assessment
Hot flashes and night sweats	Very common in perimenopause and menopause	Thyroid disease, medication effects, anxiety	Drenching sweats with weight loss or fever
Fatigue and low energy	Can accompany broken sleep and hormonal changes	Anemia, thyroid disease, depression, sleep apnea	Severe or progressive fatigue that does not improve with rest
Mood changes	Fluctuating hormones can affect mood regulation	Depression, anxiety disorders, medication effects	Persistent low mood, loss of interest, thoughts of self-harm
Sleep disruption	Night sweats and hormonal changes contribute	Sleep apnea, insomnia, bladder symptoms	Breathing pauses, severe daytime sleepiness

Supplements are sometimes the first thing people reach for because they seem low-risk and available without an appointment. But if the symptom driving the purchase is severe enough to spend money on, it is severe enough to bring to a clinician. The appointment may lead to a treatment with better evidence, or it may identify a cause (thyroid, anemia, sleep apnea) that a supplement would never have addressed.

What helps, and how well

For hot flashes specifically: hormone therapy remains the most effective treatment for vasomotor symptoms in eligible people [4]. Prescription non-hormonal options, including fezolinetant, low-dose paroxetine and other SSRIs or SNRIs, have evidence from randomized trials and are alternatives when hormones are unsuitable or unwanted. The gap between these options and the best-performing supplement is large.

For general wellbeing: regular exercise, adequate sleep, a balanced diet and stress management have broader evidence for quality of life during the transition than any supplement. They are also free, which is worth noting when a month’s supply of capsules costs $40 to $80.

If you choose to try a supplement: pick one ingredient with the best available evidence (soy isoflavones or a standardized black cohosh extract), use a product tested by an independent body (USP, NSF or ConsumerLab), tell your clinician and pharmacist, and give it a defined trial period. If it has not helped in 8 to 12 weeks, stop rather than adding a second product. A supplement that “needs more time” after three months is a supplement that is not working.

How strong is the evidence? For supplements overall: weak. For black cohosh and soy isoflavones: mixed, with some modest positive signals. For evening primrose oil, dong quai and most blends: very weak or negative. For prescription treatments (hormonal and non-hormonal): strong, from larger and better-designed trials.

Take this to your appointment

• “I have been considering a supplement for my symptoms. Is there a prescription option with stronger evidence?”
• “I am already taking [supplement name]. Are there any interactions with my other medicines?”
• “If I want to try a supplement first, which one has the best evidence and how long should I try it before reassessing?”
• “Are there non-hormonal prescriptions that might suit me if I do not want to start hormone therapy?”
• “What should I look for on a supplement label to tell whether it has been independently tested?”

See a clinician promptly if… you have any bleeding after 12 months without a period, very heavy or prolonged bleeding, new chest pain, a painful swollen leg or sudden shortness of breath, or low mood that won’t lift. If you are thinking about harming yourself, call or text 988 in the US, or call 911 in an emergency. This article is general education, not medical advice.

Read nonhormonal hot-flash treatments and hormone therapy risks for evidence-based treatment options to discuss with your clinician.