The short explanation
The evidence that soy isoflavones help hot flushes is mixed. Some studies show a small effect for some women, while others show little difference compared with dummy capsules. Evening primrose oil has not been shown to work well for hot flushes in good studies. Because these products are sold as supplements, their contents and strength can vary between brands, and they are not tested as strictly as medicines. They can also interact with other medicines, and some may not suit women with a history of breast cancer.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Before spending money on supplements, it may be worth discussing your symptoms with a doctor, who can explain treatments with stronger evidence, both hormonal and non-hormonal.
- Including soy foods, such as soya chunks or tofu, as part of a normal diet is generally fine for most women, but it is not the same as taking concentrated extracts.
- Keeping cool, cutting back on alcohol and spicy food, and regular exercise help many women at no cost.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This answer cannot tell whether a particular product is safe or useful for you. Your doctor or pharmacist can check it against your health history and other medicines.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Is there good evidence for these supplements?
- Could they interact with any of my medicines?
- Are they suitable given my health history?
- What treatments with better evidence could I try instead?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Book an appointment soon
- See a doctor within a few days if you notice a rash, stomach pain, unusual bleeding or yellow eyes after starting any supplement.
Raise it at a routine appointment
- Book a routine appointment to discuss hot flush treatments before spending on supplements.
Sources
The evidence this explanation is built on.
- Menopause — symptoms NHS
- Menopause NHS
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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