Preventing bacterial vaginosis (BV) comes down to protecting the balance of bacteria in your vagina, specifically the lactobacilli that keep your vaginal pH below 4.5. When these beneficial bacteria decline, anaerobic bacteria overgrow, triggering the fishy odor, thin discharge, and irritation that characterize BV. Up to 66% of women experience a recurrence within a year of treatment, so prevention matters far more than most people realize.
How BV Develops
A healthy vagina is dominated by lactobacilli, bacteria that produce hydrogen peroxide and lactic acid to maintain an acidic environment. BV occurs when those lactobacilli decline and are replaced by a mix of anaerobic bacteria. The vaginal pH rises above 4.5, creating conditions where these unwanted organisms thrive. Understanding this basic mechanism is what makes prevention strategies make sense: anything that disrupts your lactobacilli or raises your pH increases your risk.
Stop Douching
Douching is one of the most well-documented BV triggers. Women who douche at least once a month have a 1.4 times higher risk of developing BV or disrupted vaginal flora. That risk jumps to 2.1 times for women who douched within the previous week. Douching washes out the very lactobacilli your body needs, and the vaginal ecosystem doesn’t bounce back quickly.
The same logic applies to scented soaps, washes, and sprays used internally or around the vulva. Your vagina is self-cleaning. Warm water on the external area is sufficient. If you feel you need a cleanser for the vulva, choose one that’s fragrance-free and pH-balanced.
Use Condoms Consistently
Condoms appear to protect against developing BV, but they don’t help much once you already have it. A study tracking women over six months found that consistent condom use reduced the risk of acquiring BV by 38% in women who were BV-free at the start. Among women who already had BV, consistent condom use made no difference in recurrence.
This suggests that semen or bacteria transferred during unprotected sex can destabilize vaginal flora in the first place. If you’re prone to BV, using condoms consistently is one of the more effective preventive steps available, particularly with new or multiple partners.
Consider Partner Treatment for Recurrent BV
For years, treating sexual partners was not part of BV management. That changed in 2025 when the American College of Obstetricians and Gynecologists recommended concurrent partner treatment for the first time. The updated guidance suggests treating male sexual partners with a combination of oral and topical antimicrobials when women experience recurrent, symptomatic BV. For same-sex partners, the recommendation involves shared decision-making with a healthcare provider.
This shift reflects growing evidence that BV-associated bacteria can be harbored by partners and passed back during sex, creating a cycle of reinfection. If you’ve been treated for BV multiple times and it keeps returning, raising the question of partner treatment with your provider is worth doing.
Pay Attention to Your Menstrual Cycle
Your vaginal flora is least stable during your period. Menstrual blood raises vaginal pH, and the concentration of non-lactobacillus bacteria peaks during days one through five of your cycle. This temporary disruption happens because menstrual blood provides an additional food source for anaerobic bacteria while estrogen levels are at their lowest.
You can’t prevent menstruation, but you can minimize added disruption during this window. Change tampons and pads frequently. Avoid introducing anything that could further shift your pH, like spermicides or fragranced menstrual products. Some women find that menstrual cups or discs, which collect rather than absorb, cause less irritation.
Choose Breathable Fabrics
Synthetic underwear creates a warm, humid environment that promotes colonization by anaerobic bacteria and yeast. Cotton and breathable fabrics reduce moisture retention and support healthier microbial profiles. One prospective study found that women using antimicrobial underwear saw negative vaginal cultures double from 40% to 80%, with organisms commonly linked to recurrent vaginitis either absent or dramatically reduced. Vaginal discharge dropped from 96.7% to 6.9% in the antimicrobial group, compared to a much smaller improvement in controls.
You don’t necessarily need specialized antimicrobial fabrics. Wearing cotton underwear, avoiding tight synthetic leggings for long stretches, and sleeping without underwear to allow airflow are simple, practical steps that reduce the moisture buildup where anaerobic bacteria thrive.
Oral Probiotics That Actually Work
Not all probiotics help with vaginal health. The strain matters enormously. A randomized trial found that women taking a combination of Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14 (originally classified as L. fermentum RC-14) orally once or twice daily had normal vaginal flora in up to 90% of cases. Among 11 participants who started with asymptomatic BV, 7 converted to normal or intermediate flora within one month. In contrast, a different strain, L. rhamnosus GG, had no effect at all.
The effective dose was over 100 million viable organisms per day. When shopping for probiotics, look specifically for GR-1 and RC-14 strains rather than generic “women’s health” formulas. These bacteria survive digestion and migrate from the gut to the vaginal tract, which is why oral supplements work despite not being applied directly.
How Diet Affects Your Risk
What you eat can influence your vaginal microbiome, though this connection gets less attention than it deserves. A case-control study found that women with the highest adherence to an “unhealthy diet” pattern, characterized by high saturated fat from red meat, fried foods, and solid oils, had 3.35 times the odds of BV compared to women with the lowest adherence. High dietary glycemic load has also been linked to BV development and persistence.
On the other side, women following an ovo-vegetarian pattern had 84% lower odds of BV. A Mediterranean-style pattern rich in nuts, fish, and olive oil also showed protective effects. The likely mechanism is that saturated fat intake elevates vaginal pH and alters flora composition, though the exact pathway isn’t fully understood. You don’t need to overhaul your diet, but reducing fried and processed foods while increasing vegetables, healthy fats, and fiber may offer a meaningful edge, especially if you’re dealing with recurrent episodes.
Managing Recurrent BV
If BV keeps coming back despite lifestyle changes, suppressive therapy is an option. CDC guidelines describe several approaches for women with multiple recurrences. One regimen involves treating the active infection first, then using a vaginal gel twice weekly for three or more months to keep BV from returning. Another protocol adds a three-week course of intravaginal boric acid after antibiotic treatment, followed by months of maintenance therapy.
The limitation is that recurrence rates climb again once suppressive therapy stops. This is why the lifestyle and partner-treatment strategies above matter so much. Suppressive therapy buys time for your vaginal flora to stabilize, but lasting prevention usually requires addressing the underlying triggers: what’s being introduced to the vaginal environment, what’s disrupting your lactobacilli, and whether reinfection from a partner is part of the cycle.