ERr 731: the quiet rhubarb extract with real science behind it
If you have read The New Menopause, listened to a few menopause podcasts, or scrolled through r/Menopause supplement threads, you have likely seen most of the usual suspects — black cohosh, evening primrose, sage. ERr 731 is rarely on those lists, which is curious, because the clinical record on it is more developed than most of the better-known options.
Here is a calm overview.
What ERr 731 is
ERr 731 is a specific extract of the roots of Siberian rhubarb (Rheum rhaponticum). It has been used in Europe for several decades as a non-hormonal support option for women in perimenopause and menopause. It is not a phytoestrogen in the conventional sense — its mechanism is different, and that distinction matters for women who are looking for support but cautious about anything that mimics estrogen broadly.
The extract is standardised. The clinical research has been done specifically on ERr 731 as a defined extract, not on rhubarb in general — which is the kind of specificity worth paying attention to. Generic rhubarb supplement is not the same thing.
What the research shows
ERr 731 has been studied in several randomized clinical trials in women in perimenopause and menopause. The published work has looked at:
- Women's self-reported menopausal symptom scores, particularly using the Menopause Rating Scale
- Safety profile across 12-week and longer studies
- Comparison against placebo
The Menopause Society and other clinical bodies have noted ERr 731 in their reviews of non-hormonal menopause support options. Dr. Mary Claire Haver, in her work on The New Menopause, has talked about the spectrum of non-HRT support tools for women who are not candidates for HRT or who are looking for additional support alongside.
The clinical record is one of the more developed in the non-HRT support category. Worth knowing it exists.
Why most women have not heard of it
ERr 731 has been used much more widely in Europe than in the US. The extract is sold in clinical formulations in Germany under brand names that don't reach the US wellness market. American women navigating menopause have heard much more about black cohosh than about ERr 731 — partly history, partly marketing.
This is one of the reasons Dr. Louise Newson, in her work on the Balance app and in her writing, has emphasised that midlife women should be educated about all of the support options, not just the most marketed ones.
What ERr 731 is not
It is not HRT. It is not a replacement for HRT. It is not appropriate for every woman, particularly if there are specific medical contraindications. Alloy Health and other telehealth-with-editorial menopause platforms have been careful to frame supplement support as adjacent to clinical care, never a substitute.
It is also not a quick fix. The clinical studies that show benefit have run for 12 weeks or longer. The body's response to a botanical extract is on the slow time scale, not the fast one.
How Revhora uses it
Menopause Support PM is formulated around ERr 731 alongside other ingredients selected for the system shifts of midlife. It is a daily evening ritual designed for women who want considered, non-HRT support and who understand that the body's response is on the order of months, not weeks.
Used over 8–12 weeks of consistency, alongside basics like sleep structure, nutrition, and stress regulation, women often report a clearer sense of equilibrium.
If you are considering or currently on HRT, talk with your prescriber about whether ERr 731 fits alongside your protocol. Most clinicians are familiar with it; some are not yet — share the literature.
Sources & further reading
- The Menopause Society. Authoritative menopause clinical resource; reviews of non-HRT support. menopause.org
- Dr. Mary Claire Haver — The 'Pause Life. The New Menopause and her work on the spectrum of menopause support. thepauselife.com
- Dr. Louise Newson. Balance app and editorial archive on menopause support options. drlouisenewson.co.uk
- Alloy Health. Editorial library on non-HRT menopause support framing. myalloy.com
This article is for informational purposes only and does not constitute medical advice. Revhora products are designed to support — not treat, cure, or prevent — and consistent results take time. If you're experiencing symptoms that concern you, please consult a qualified healthcare provider.