Black Cohosh, Soy, Red Clover and "Hormone Balance" Claims
Claim check on black cohosh, soy, red clover, evening primrose oil, maca, "hormone balance" and "natural hormone replacement": what research shows and the safety risks.
Content last updated . This page has not been medically reviewed.
Why a claim check
Many products promise to "balance hormones", "replace hormones naturally" or relieve menopause symptoms. This page checks the claims against research summaries. It is not a recommendation to use any product. Evidence labels: established recommendation, promising but limited, mixed, insufficient evidence, preclinical (animal or lab only). We did not find reliable evidence for any product as a replacement for medical care.The NHS says herbal remedies sold for menopause, such as red clover and black cohosh, have very little evidence on how well they work or how safe they are, and some can cause serious side effects with other medicines. [1] The North American Menopause Society lists supplements and herbal remedies as not recommended for hot flashes. [2]
Claim check
| Claim | What the sources found | Label |
|---|---|---|
| Black cohosh relieves hot flashes | NCCIH describes a 2023 review of 22 studies that found potential benefit for overall menopause symptoms and hot flashes, but not anxiety or depression. [3] A 2012 Cochrane review of 16 trials found no difference from placebo in hot flash frequency. [4] A 2026 review rated black cohosh as moderate-certainty but said overall evidence is limited. [5] | Mixed |
| Soy and isoflavones ease hot flashes | NCCIH says the effect may be small and results inconsistent. [6] A 2013 Cochrane review (43 trials) found no conclusive evidence, with a strong placebo effect. [7] A 2016 JAMA meta-analysis found modest reductions in hot flashes but low-quality trials. [8] | Mixed |
| Soy helps bones | NCCIH says soy isoflavones probably have a beneficial effect on bone density in postmenopausal women. [6] See osteoporosis and bone health. | Promising but limited |
| Red clover works | NCCIH says research has not shown conclusive benefit for any condition; hot flash studies were inconsistent. [9] Cochrane found no significant difference for the red clover extract Promensil versus placebo in pooled trials. [7] | Insufficient evidence |
| Evening primrose oil helps menopause or PMS | NCCIH: insufficient evidence for PMS and menopause symptoms. [10] | Insufficient evidence |
| Maca "balances hormones" or eases menopause | A systematic review found four small trials and limited evidence, and said safety had not been proven. [11] | Insufficient evidence |
| "Balances hormones" (general) | We did not find a medical definition of "hormone balancing" in the NHS, NIA, NCCIH or FDA pages we read. Proper evidence not found. | Not assessed |
| "Natural" or "bioidentical" hormones are safer | The FDA says many marketed "bioidentical hormones" are compounded drugs that are not FDA-approved, and it has no evidence they are safer or more effective than approved therapy. [12] It also says natural does not always mean safe. [12] | Unproven |
| Supplements improve fertility | For antioxidant supplements in women with subfertility, a Cochrane review judged the evidence very low quality and was uncertain about live birth. [13] NCCIH says there is not enough reliable evidence on chasteberry for infertility. [14] | Insufficient evidence |
Safer ways to look for relief
Evidence-based options include hormone therapy and several non-hormone medicines and CBT, covered in perimenopause and menopause and hot flashes. The FDA suggests asking your clinician about the risks and benefits of hormones, including "bioidenticals", and about the herbs or supplements you take. [12]Frequently asked questions
Does black cohosh work?
Evidence is mixed. Some reviews found benefit and a Cochrane review found none. [3][4]
Are bioidentical hormones safer?
The FDA says it has no evidence that compounded bioidentical hormones are safer or more effective than FDA-approved hormone therapy. [12]
Can supplements balance my hormones?
We found no reliable evidence for "hormone balancing" as a treatment. Specific products have limited or mixed evidence for specific symptoms. [2]
Is soy safe to eat?
Some people are allergic to soy, and soy in amounts greater than those found in foods may be unsafe in pregnancy. [6]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety
- Liver: NCCIH says cases of liver damage, some serious, have been reported with products labeled black cohosh, though they are rare and the cause is uncertain. [3] The National Institute on Aging also warns of liver damage risk. [15] See liver safety.
- Wrong or mixed ingredients: some commercial black cohosh products contained the wrong herb or unlisted herbs. [3] Black cohosh is not the same as blue cohosh, which can cause high blood pressure and has been linked to complications in infants. [3] See product quality and contamination.
- Hormone-sensitive conditions: it is uncertain whether black cohosh is safe after breast or uterine cancer, and chasteberry may not be safe in hormone-sensitive conditions. [3][14]
- Soy: soy is a common food allergen, and soy in amounts beyond usual food amounts may be unsafe in pregnancy. [6] Certain high-tyramine soy products can interact with MAO inhibitor antidepressants. [6] See soy foods.
- Pregnancy and breastfeeding: black cohosh, red clover and chasteberry may not be safe. [3][9][14] See pregnancy and breastfeeding safety.
- Medicines: herbs and medicines can interact in harmful ways. [6] See medication interactions.
Never stop prescribed hormone therapy or other medicine to try an herb without talking to your prescriber.
When to get help
If you take black cohosh, NCCIH advises consulting your health care provider if you develop symptoms of liver damage such as dark urine and fatigue. [3] Any vaginal bleeding after menopause needs evaluation. [16]
References
- NHS. Treatment for menopause and perimenopause. Read 2026-10-22.
- The 2023 nonhormone therapy position statement of The North American Menopause Society. Menopause. 2023. PubMed. Read 2026-10-22.
- NCCIH. Black cohosh. Read 2026-10-22.
- Leach MJ, Moore V. Black cohosh (Cimicifuga spp.) for menopausal symptoms. Cochrane Database Syst Rev. 2012. PubMed. Read 2026-10-22.
- Complementary therapies for management of menopausal symptoms: a systematic review to inform the update of the International Menopause Society guidelines. Climacteric. 2026. PubMed. Read 2026-10-22.
- NCCIH. Soy. Read 2026-10-22.
- Lethaby A, et al. Phytoestrogens for menopausal vasomotor symptoms. Cochrane Database Syst Rev. 2013. PubMed. Read 2026-10-22.
- Franco OH, et al. Use of plant-based therapies and menopausal symptoms: a systematic review and meta-analysis. JAMA. 2016. PubMed. Read 2026-10-22.
- NCCIH. Red clover. Read 2026-10-22.
- NCCIH. Evening primrose oil. Read 2026-10-22.
- Lee MS, et al. Maca (Lepidium meyenii) for treatment of menopausal symptoms: a systematic review. Maturitas. 2011. PubMed. Read 2026-10-22.
- U.S. Food and Drug Administration. Menopause. Read 2026-10-22.
- Showell MG, et al. Antioxidants for female subfertility. Cochrane Database Syst Rev. 2020. PubMed. Read 2026-10-22.
- NCCIH. Chasteberry. Read 2026-10-22.
- National Institute on Aging. Hot flashes: what can I do?. Read 2026-10-22.
- NHS. Postmenopausal bleeding. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.