Search for "menopause probiotic" and you'll find bold promises about balancing hormones, stopping hot flashes and protecting your bones. The research is more interesting than the marketing, and a good deal more modest.
Here's what studies in women around menopause have actually tested, what they found, and how to use that information if you're considering a probiotic.
Why researchers are looking at the gut
Menopause appears to go hand in hand with changes in the gut microbiome. In a large study of Hispanic and Latino adults in the US, which included 2,300 participants, postmenopausal women tended to have lower gut bacterial diversity than premenopausal women, and their overall microbiome looked more like men's. Postmenopausal women also had less of a bacterial enzyme called beta-glucuronidase, which is involved in recycling hormones in the gut. These microbiome differences were linked to less favorable cardiometabolic profiles (Peters et al., 2022).
That raises an obvious question: could adding specific bacteria change anything that matters for women? A handful of trials have started to test it. Here's more on how the gut changes after 40.
Bone density: the most consistent signal so far
In a Swedish trial, 249 healthy women in early postmenopause took a capsule with three Lactobacillus strains (L. paracasei DSM 13434, L. plantarum DSM 15312 and L. plantarum DSM 15313) or a placebo every day for 12 months. Women on placebo lost 0.72% of their lumbar spine bone density, while the probiotic group showed no measurable loss. Side effects were similar in both groups. The trial was funded by the company that makes the product (Jansson et al., 2019).
A 2024 meta-analysis pooled 12 randomized trials with 1,183 postmenopausal women. Probiotic supplements were associated with higher bone density at both the lumbar spine and the hip compared with control groups, and the effect appeared stronger in women with osteopenia (low bone density) than in women with osteoporosis. The authors called for more trials to confirm the findings (Wang et al., 2024).
Two caveats matter. These studies measured bone density and related markers, not fractures. And they tested many different strains and combinations, so a result for one product doesn't carry over to another.
Estrogen levels: early and exploratory
A newer line of research focuses on bacteria that can reactivate estrogen in the gut. In an exploratory randomized trial, healthy women in perimenopause or after menopause took either a probiotic formula containing Levilactobacillus brevis KABP052, a strain selected for its high beta-glucuronidase activity, or a placebo. After 12 weeks, estrogen levels held steady in the probiotic group but fell in the placebo group. Estradiol averaged 31.62 pg/mL vs. 25.12 pg/mL, and estrone 21.38 pg/mL vs. 13.18 pg/mL (Honda et al., 2024).
The study was carried out by researchers from the companies developing the formula, and it didn't show that symptoms improved. A higher estrogen level also isn't automatically good or bad for every woman. It's a starting point for research, not a recommendation.
Menopause symptoms and mood: small, short trials
In a triple-blind trial in Iran, 84 postmenopausal women took a probiotic capsule or a starch placebo daily for six weeks. The probiotic group had greater improvements in depression, anxiety and stress scores, and in physical, psychological and urogenital menopause symptoms, at both three and six weeks (Ayubi et al., 2025).
That's encouraging, but it was a single six-week study in one city, and the authors themselves called for larger trials with longer follow-up before drawing firm conclusions.
What this means if you're shopping
Match the strain to the claim. If a product cites bone or menopause research, check whether that exact strain, combination and dose were tested.
Be wary of "hormone balancing" language. The research on estrogen levels is early, and none of the trials above tested a probiotic as a replacement for hormone therapy or bone medication.
Set a realistic goal. Digestive comfort is a reasonable, trackable reason to try a probiotic. Bone density changes take a year or more and a scan to measure.
For transparency, our Daily Biotic contains LP299V, HN019 and NCFM, strains that have been studied for digestive symptoms rather than for bone density or menopause symptoms.
Safety first
Talk to your doctor before starting a probiotic if you're immunocompromised, seriously ill or have a central line. Keep any bone-health plan your doctor has recommended in place. And see a doctor, rather than trying a supplement, for new bloating on most days, blood in your stool, unexplained weight loss or any bleeding after menopause.
Sources
Peters BA, Lin J, Qi Q, et al. Menopause is associated with an altered gut microbiome and estrobolome, with implications for adverse cardiometabolic risk in the Hispanic Community Health Study/Study of Latinos. mSystems. 2022;7(3):e0027322. PMID 35675542
Jansson PA, Curiac D, Lazou Ahrén I, et al. Probiotic treatment using a mix of three Lactobacillus strains for lumbar spine bone loss in postmenopausal women: a randomised, double-blind, placebo-controlled, multicentre trial. Lancet Rheumatol. 2019;1(3):e154-e162. PMID 38229392
Wang F, Wei W, Liu PJ. Effects of probiotic supplementation on bone health in postmenopausal women: a systematic review and meta-analysis. Front Endocrinol (Lausanne). 2024;15:1487998. PMID 39553313
Honda S, Tominaga Y, Espadaler-Mazo J, et al. Supplementation with a probiotic formula having β-glucuronidase activity modulates serum estrogen levels in healthy peri- and postmenopausal women. J Med Food. 2024;27(8):720-727. PMID 38742994
Ayubi E, Abdoli S, Mehrpooya M, et al. The effect of probiotic administration on the severity of menopausal symptoms and mental health of postmenopausal women: a triple-blind randomized controlled trial in the West of Iran. Menopause. 2025;32(2):166-173. PMID 39774869
This article is for general information and isn't medical advice. Talk to your healthcare provider before starting a probiotic, especially if you're immunocompromised, take prescription medication or are being treated for bone loss.
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