Study, 2026
Can helpful bacteria from the vagina treat PMS?
Maybe. Several bacteria strains from healthy women showed promising features in lab tests related to PMS, but they have not yet been tested in women.
What they did
Researchers collected bacteria from the vaginas of healthy Korean women and grew 12 different strains in lab dishes. They tested whether these bacteria had properties that might help with PMS, such as surviving in acidic conditions and fighting off harmful bacteria.
What they found
Five bacteria strains (KVS001, KVS002, KVS004, KVS006, and KVS008) showed strong potential. They survived in acidic conditions, attached well to cells, fought harmful bacteria effectively, and reduced an enzyme involved in how the body recycles estrogen.
What it means for you
These bacteria might someday help treat PMS, but much more research is needed. This study only tested bacteria in lab dishes, not in women. We don't yet know if these would actually help when used as a probiotic, what dose would be safe, or if they would improve symptoms.
12
bacteria strains tested
5
strains with strong potential
About the study
- Original title
- Identification and functional characterization of lactic acid bacteria with probiotic potential for alleviating premenstrual syndrome symptoms
- Authors
- Yoon SH, Lew LC, Park YH et al.
- Journal
- Frontiers in microbiology
- Year
- 2026
- Study design
- Study
- What was tested
- Lab testing of probiotic bacteria strains
- Open access
- Yes
- Read the paper
- doi.org/10.3389/fmicb.2026.1866966
Original abstract
Introduction: Premenstrual syndrome (PMS) is a relatively widespread disorder associated with cyclical hormonal oscillations and disruptions in microbial homeostasis, particularly involving β-glucuronidase -producing bacteria that facilitate estrogen reabsorption. This study aimed to isolate, identify and functionally characterize probiotic strains from the vaginal microbiota of healthy Korean women in order to evaluate their potential in mitigating PMS-associated pathophysiology. Materials and methods: A total of 12 isolates, named as KVS strains, were evaluated for their probiotic potential, including antimicrobial, enzyme inhibitory, and anti-adhesive activities associated with PMS. These isolates were further evaluated for adhesion capacity, survival under acidic conditions, auto-aggregation ability, inhibition of β-glucuronidase activity, antimicrobial activity, and suppression of Gardnerella vaginalis adhesion to HeLa cells. Results and discussion: Several KVS strains, such as KVS001, KVS002, KVS004, KVS006, and KVS008 showed strong probiotic potential, adhesion capacity, high auto-aggregation rates, and survival in acidic conditions. In addition, these strains showed high antimicrobial activity and significantly suppressed β-glucuronidase activity, suggesting a mechanism for reducing estrogen recirculation. Moreover, many isolates effectively inhibited G. vaginalis adhesion to HeLa cells, indicating strong potential to counteract dysbiosis-associated PMS triggers. Collectively, the findings identify multiple KVS strains as promising probiotic candidates with multifunctional mechanisms relevant to PMS alleviation, supporting their prospective development as health-functional foods or therapeutic agents targeting microbiome-mediated hormonal modulation.
Reproduced under CC-BY.