Vaginal microbiome
The infection keeps coming back because nothing changed the environment.
Antibiotics clear the organism. They don't restore what was keeping it in check. We test to find out which bacteria are actually present — then treat in four steps, ending with the one most protocols skip: fixing the reason Lactobacillus stopped growing in the first place.
What is the vaginal microbiome?
SHORT ANSWER
The vaginal microbiome is the community of bacteria living in the vagina. In healthy conditions it is dominated by Lactobacillus species, which produce lactic acid and keep the environment acidic — typically below pH 4.5. That acidity suppresses the organisms that cause infection, irritation, and odor.
After menopause that dominance frequently collapses. Estrogen maintains the glycogen in vaginal tissue that Lactobacillus feeds on; as estrogen falls, the food source falls with it, Lactobacillus declines, pH rises, and a more diverse mix of bacteria moves in.
That shift is measurable. It is also the reason a course of antibiotics can work perfectly and the same problem can return six weeks later.
Before and after menopause, measured.
A microbiome test reports which species are present and in what proportion. These are the two patterns it most often finds.
Premenopausal — Lactobacillus-dominant
PH below 4.5
Lactobacillus 85%
Other
Lactic acid production keeps pH low. Pathogens are suppressed before they establish.
Postmenopausal — diverse, low Lactobacillus
PH above 5.0
Lactobacillus 25%
Diverse flora
Pathogens
Higher pH, greater diversity, and room for organisms that cause infection, irritation, and odor.
Standard infection treatment compared with microbiome-directed treatment
Why antibiotics work — and then stop working.
Nothing is wrong with the prescription. It does what it was designed to do. The issue is what it isn't designed to do.
Standard course of antibiotics
Microbiome testing & restoration
What it targets
The organism causing this episode
The environment that allowed the episode
What it measures
Presence or absence of infection
Which species are present, and in what proportion
Effect on Lactobacillus
Often reduced further — antibiotics are not selective
Restoration is the explicit goal
Effect on pH
Not addressed
Addressed directly
Typical outcome
Resolution, then recurrence weeks or months later
Fewer episodes because the conditions changed
When it's right
A single acute infection
A pattern of repeated infections
Hormonal?
No — suitable after breast cancer
No — suitable after breast cancer
How the vaginal microbiome is treated
Vaginal microbiome restoration is a four-step protocol: clear the overgrowth with an agent targeted to what the test found, restore acidic pH, repopulate Lactobacillus with evidenced probiotic strains, and correct the underlying reason Lactobacillus declined — usually low estrogen. Skipping the fourth step is why most attempts fail.
Each step is matched to your results. Two women with recurrent infections can need entirely different agents, and treating the wrong organism is a common reason symptoms persist.
01
Clear what has overgrown
Targeted to the organism identified, not broad-spectrum. Anaerobic overgrowth, yeast, and aerobic vaginitis each require a different agent — and the wrong one can make the picture worse by clearing helpful bacteria along with harmful ones. Where a non-hormonal, non-antibiotic approach is preferred, medical ozone is used for its antimicrobial effect.
02
Restore acidic pH
A healthy vagina sits below pH 4.5. After menopause it commonly rises above 5.0, which is the condition that lets pathogens establish. Boric acid vaginal suppositories and lactic acid preparations are used to bring pH down — boric acid in particular has a real clinical role in recurrent and treatment-resistant cases.
03
Repopulate Lactobacillus
Clearing an overgrowth leaves empty space, and what fills it determines whether the problem returns. Specific strains have the best evidence for colonizing vaginal tissue — Lactobacillus rhamnosus GR-1 and L. reuteri RC-14 among them — delivered orally or as a vaginal suppository. Strain selection matters; most retail probiotics contain strains studied for the gut, not the vagina.
04
Restore the food supply
Lactobacillus feeds on glycogen. Vaginal tissue produces glycogen in response to estrogen. In a postmenopausal woman with low estrogen, steps one through three can be executed perfectly and still fail within weeks, because there is nothing for the new bacteria to live on. Local vaginal estrogen corrects this. Where estrogen is not appropriate — including after hormone-receptor-positive breast cancer — vaginal DHEA is an alternative that acts locally.
The published studies - The Research
Maturitas · 2026
Effect of Lactobacillus-based probiotics on genitourinary syndrome of menopause: a systematic review
Twenty-three studies covering 5,027 participants. Postmenopausal women consistently showed reduced Lactobacillus and increased bacterial diversity. Specific species mapped to specific symptoms — Prevotella with urinary symptoms, Finegoldia magna with recurrent UTI, Streptococcus with pain during sex.
Peer-reviewed study
Etiology of recurrent cystitis in postmenopausal women based on vaginal microbiota
Found that vaginal dysbiosis — fewer Lactobacilli alongside E. coli colonization — drives recurrent cystitis after menopause. Restoring the vaginal environment with intravaginal estriol reduced recurrence from 5.9 to 0.5 episodes per patient-year.
Diagnostics · 2023
Menopausal changes in the microbiome — a review of the genitourinary microbiome
Documents how falling estrogen raises vaginal pH and reduces Lactobacillus, contributing to genitourinary syndrome of menopause. Notably, menopause also lowers urinary Lactobacillus — and that change precedes the onset of recurrent cystitis.
Who this is for — and who it isn't.
Likely a fit if
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You've had two or more urinary tract infections in the past year
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Bacterial vaginosis or yeast keeps returning after treatment
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You have persistent irritation, itching, or odor without a clear diagnosis
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You've had multiple antibiotic courses and the pattern hasn't changed
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Standard swabs have come back negative but symptoms continue
Not a fit if
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You have fever, flank pain, or blood in your urine, which needs urgent evaluation now
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You're currently mid-course on antibiotics, which alters results — we test afterward
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You can't attend in person for collection