Perimenopause supplements: an honest guide to what the evidence actually says

Which perimenopause supplements have real evidence?

Most supplement trials in this area are small and short. Many are paid for by the companies that sell the product. A few randomized controlled trials exist for the better-studied options. In those trials, people are assigned at random to the supplement or a dummy pill, which makes the result more reliable. For many other products, the evidence is anecdotal or comes from weaker studies.

Most supplements also target one symptom, like sleep, mood or joint pain, rather than the hormonal shift behind it. That is not a reason to dismiss them. It is a reason to be realistic about what they can do. Here is the short version:

• Magnesium: sleep and anxiety, with modest evidence.
• Vitamin D: bone health, especially if your level is low.
• Creatine: muscle, and possibly mood and thinking.
• Omega-3s: mood, mainly from fish oil rich in EPA.
• Black cohosh and soy: hot flashes, with weak and inconsistent evidence.

Magnesium: a low-risk pick for sleep and anxiety

Magnesium is one of the most popular supplements for women in perimenopause. Low magnesium is linked with poorer sleep and more anxiety. In small trials in older adults, magnesium helped people fall asleep about 17 minutes faster. The reviewers rated that evidence as low quality, so expect a modest effect. Glycinate and bisglycinate are popular forms because they are gentle on the gut.

Mind the dose. The NIH sets a safe upper limit of 350 mg a day of magnesium from supplements for adults. Many products suggest 200 to 400 mg, so the top of that range goes over the limit. Stay at or under 350 mg a day from supplements. Too much mostly causes diarrhea.

Magnesium combined with vitamin B6 has helped anxiety and mood in some trials. It is cheap and low risk, which is why many women start here. Our guide to magnesium in perimenopause covers which form to pick, how much to take and when.

• Popular forms: glycinate or bisglycinate, gentle on the gut.
• Evidence: modest, for sleep and anxiety.
• Dose: up to 350 mg a day from supplements, the NIH upper limit.
• Note: does not treat hot flashes or night sweats.

Vitamin D: bone support as estrogen falls

Estrogen helps the body keep bone strong. As estrogen falls in perimenopause, bone loss speeds up. Vitamin D helps your body absorb the calcium that bone needs. About one in four Americans has a vitamin D level that is low or borderline, according to NIH survey data. The Menopause Society recommends enough vitamin D and calcium as basic bone support. Our vitamin D guide covers how much to take, and what it won't do.

Vitamin D3, also called cholecalciferol, raises blood levels better than D2. Some women pair it with vitamin K2 in the MK-7 form. The idea is that K2 helps steer calcium into bone. That evidence is still early.

More is not better for most women. For healthy adults under 75, the Endocrine Society's 2024 guideline sees no benefit in taking more than the daily amount. It also advises against routine vitamin D blood tests. If you have bone loss or another medical reason, your clinician may test you and suggest more.

• Evidence strongest for: bone health, mainly if you fall short.
• Daily amount: 600 IU for adults up to age 70, and 800 IU after. IU is the unit printed on the label.
• Upper limit: 4,000 IU a day, set by the NIH.
• Calcium: get it from food where you can. Supplement only if your diet falls short.

Creatine monohydrate: the underrated option for muscle

Creatine may be the most overlooked supplement for women in perimenopause. It is one of the most studied sports supplements. Its benefits reach beyond the gym. Muscle loss speeds up in midlife. Creatine combined with strength training helps you keep lean mass, meaning muscle.

A 2021 review by Smith-Ryan and colleagues in the journal Nutrients looked at creatine in women's health. It points to possible benefits for muscle, bone and mood across a woman's life, including after menopause. Early studies also suggest help with memory and mental fatigue. That part is still emerging. For the dose, side effects and the bone trials, see our creatine for perimenopause guide.

• Best form: creatine monohydrate, the cheapest and best studied.
• Evidence strongest for: muscle mass and strength, especially with resistance training.
• Emerging: mood, memory and mental fatigue.
• Note: does not treat hot flashes or sleep.

Omega-3 fatty acids: some help for mood, none for hot flashes

Omega-3s are the EPA and DHA fats found in fish or algae oil. EPA has the stronger link to mood. In people with depression, several pooled analyses found that EPA-rich formulas eased symptoms. Heart protection from pills is less clear. In the large VITAL trial, fish oil did not lower major heart events in healthy adults.

For hot flashes, omega-3s do not help. The largest trial, called MsFLASH, gave midlife women fish oil or a dummy pill for 12 weeks. Hot flashes eased no more with fish oil than with the dummy pill. Sleep and mood did not improve either.

• Best form: fish oil or algae oil with 1,000 to 2,000 mg of EPA and DHA combined.
• Limit: the FDA advises no more than 2 grams a day of EPA and DHA from supplements.
• Evidence strongest for: mood, in people with depression.
• Quality: look for third-party testing such as IFOS or NSF. Fish oil can go rancid or carry contaminants.

Does black cohosh work for hot flashes?

Black cohosh is the most studied herbal remedy for hot flashes. The results are mixed. Some trials show a modest drop in how often and how hard hot flashes hit. Others show no difference from a placebo, or dummy pill.

A 2023 analysis in the journal Menopause pooled 22 trials. Across about 2,300 women, black cohosh eased hot flashes and overall menopause symptoms more than a placebo. It did not help anxiety or depression. An earlier Cochrane review, a respected summary of trials, found too little evidence to recommend it. The Menopause Society reviewed non-hormonal treatments in 2023. It does not recommend black cohosh, soy or other herbal supplements for hot flashes. The evidence is not strong enough.

On safety, rare cases of liver injury have been reported. The US Pharmacopeia, which sets quality standards, recommends a liver warning on black cohosh labels. So it is not a fit for anyone with liver disease. At tested doses, it appears generally safe for most women. Our Estroven review shows which Estroven boxes contain black cohosh and which use a rhubarb extract instead.

• Evidence for: hot flash frequency and severity, modest and inconsistent across trials.
• Avoid if: you have liver disease or take medicines that can harm the liver.
• Buy carefully: some products tested by researchers held the wrong herb. Pick one checked by an independent lab.

Do soy isoflavones and other phytoestrogens help?

Phytoestrogens are plant compounds that act a little like a weak estrogen. Soy isoflavones, such as genistein and daidzein, are the best known. Several trials found a small drop in how often hot flashes occur. The effect is smaller than hormone therapy, and the results are inconsistent. The Menopause Society does not recommend them for hot flashes. Some women with mild symptoms who prefer a non-hormonal route still try soy foods or supplements. Our soy for menopause guide covers doses, safety and St. John's wort.

Red clover isoflavones work in a similar way and have similarly mixed evidence. Some breast cancers are fed by estrogen, called estrogen receptor-positive. If you have had one, talk to your oncologist before using any phytoestrogen. Guidance on this is not settled.

Which supplements don't have strong evidence?

These are widely marketed for perimenopause, but the evidence is weak, inconsistent or industry-funded:

• DHEA: a prescription vaginal insert, prasterone, is FDA approved for painful sex caused by menopause. DHEA pills have little evidence for other symptoms and are loosely regulated.
• Evening primrose oil: widely sold for hot flashes, with no consistent evidence.
• Maca root: a few small trials suggest help with mood and libido; the hot flash results come mostly from trials linked to a maca supplier. Our maca for menopause guide walks through them.
• Ashwagandha: some general stress evidence, but few trials in perimenopause. Our ashwagandha for perimenopause guide looks at what exists.
• Progesterone creams: over-the-counter creams do not deliver enough progesterone to protect the uterus from estrogen. They are not a substitute for prescribed progesterone.

How to use supplements in perimenopause without wasting money

Clinicians who specialize in perimenopause treat supplements as support, not as a replacement for medical care. The usual order is foundations first: sleep habits, strength training, enough protein and less alcohol. Our perimenopause diet guide covers the food side. Then come targeted supplements for specific symptoms. Prescription options come next if symptoms are moderate to severe. For hot flashes, those include hormone therapy and non-hormonal medicines, covered in our perimenopause hot flashes guide.

If symptoms are really affecting your life, supplements alone are unlikely to be enough. That might mean broken sleep most nights, hot flashes that disrupt work, or mood changes you can't manage. That is when a prescription conversation makes sense.