Menopause

A genuine biological mechanism: the "estrobolome"

Gut bacteria carry a collection of genes, sometimes called the "estrobolome," that reactivate oestrogen as it passes through the intestines and send it back into the bloodstream, effectively recycling a portion of the body's oestrogen supply. When gut bacterial diversity drops, a change that happens naturally around menopause, this recycling system becomes less efficient, potentially compounding the drop in circulating oestrogen that drives menopausal symptoms in the first place.

Source: The gut microbiota in menopause: Is there a role for prebiotic and probiotic solutions?

A meta-analysis with large effects, and an honest caveat about quality

A systematic review and meta-analysis of 7 trials comparing probiotics with placebo found large effects on total menopausal symptom scores, hot flashes specifically, psychological symptoms, and markers of vaginal health. The same review was honest that only about a third of the studies in its broader analysis were judged to have a low risk of bias, with a substantial share rated as having critical or high risk, meaning the size of these effects should be treated with real caution until confirmed in more rigorous trials.

Source: Investigating the effects of probiotics during the menopause transition: A systematic review & meta-analysis

As with any probiotic, the strains used in these trials only work if they're properly fed. A probiotic taken during menopause still needs fibre and plant compounds to establish itself well enough to support the estrobolome's recycling function, rather than just passing through.

A separate, more established use for bone health

Beyond symptom relief, some trials have found specific probiotic strains helped prevent bone mineral density loss at the spine and hip in postmenopausal women, though a broader review found this evidence to be weak, with very high variability between studies. This is a distinct, ongoing area of research from symptom relief, reflecting the gut's broader role in calcium absorption during a period of accelerated bone loss.

What this means for you

Menopause symptoms significantly affecting quality of life are worth discussing with a doctor, since hormone replacement therapy remains the primary, most thoroughly evidenced treatment and a probiotic is not a substitute for it. Given the promising but still uncertain trial evidence above, a specific, well-studied probiotic strain is a reasonable, low-risk addition to try alongside standard care, with realistic expectations given the mixed quality of research behind it. A varied, plant-rich diet supports the same gut bacteria this research ties to healthier oestrogen recycling. That's the same idea behind GutLab, everyday gut health starts with regularly feeding the microbiome a broad range of plant-rich ingredients.