Bacterial vaginosis comes back after treatment more often than most people realize. Even after a successful course of antibiotics, up to 60% of women experience a recurrence within 12 months. That frustrating cycle isn’t inevitable, though. A combination of everyday habits, smart product choices, and in some cases maintenance therapy can significantly lower your odds of another episode.
Why BV Keeps Coming Back
A healthy vagina maintains a pH between 4.0 and 4.5, kept acidic by protective bacteria (primarily Lactobacillus species) that crowd out harmful organisms. BV develops when that balance tips, the pH rises above 4.5, and a mix of unwanted bacteria takes over. Antibiotics knock those bacteria back, but they don’t always restore the protective community to full strength. If the underlying conditions that disrupted your microbiome in the first place haven’t changed, the same shift happens again.
That’s why prevention isn’t about any single trick. It’s about consistently protecting the environment that lets good bacteria thrive.
Use Condoms Consistently
Semen is alkaline, which temporarily raises vaginal pH after unprotected sex. Over time, repeated exposure can make it harder for protective bacteria to maintain their foothold. Research published in the New England Journal of Medicine found that consistent condom use cut the risk of new, persistent, or recurrent BV by roughly half. If you’re prone to recurring infections, this is one of the highest-impact changes you can make.
Stop Douching and Internal Washing
Vaginal washing, even with water alone, directly harms the bacteria you need most. One study found that washing inside the vagina in the prior week was associated with a 44% decrease in Lactobacillus detection, with greater losses at higher washing frequencies. At the same time, washing increased the presence of BV-associated bacteria. The vagina is self-cleaning. External washing of the vulva with warm water (or a gentle, fragrance-free cleanser) is all you need. Anything marketed for internal “freshness” works against you.
Some common intimate products are surprisingly damaging. In lab testing, certain vaginal moisturizers and lubricants had bactericidal effects on protective Lactobacillus within 24 hours. If you use lubricant, look for one that’s pH-matched (around 4.0 to 4.5) and free of glycerin, which can feed unwanted bacteria.
Choose Your Menstrual Products Carefully
Your period is a high-risk window for BV. Menstrual blood raises vaginal pH, and the longer blood sits in the vaginal canal, the more it feeds the bacteria that cause problems. Tampons absorb blood but keep it in contact with vaginal tissue, creating an iron-rich environment that BV-associated bacteria thrive in.
Menstrual cups offer a measurable advantage. A study from the University of Illinois Chicago found that menstrual cup users were 26% less likely to have BV and 37% more likely to have an optimal vaginal microbiome compared to non-users. Cups collect blood rather than absorbing it and do a better job maintaining the vagina’s acidic environment. If cups aren’t for you, change tampons frequently and consider switching to pads overnight to give your vaginal environment a break.
Pads and reusable cloths carry their own risk if worn too long or not cleaned properly, since bacteria on the surface can transfer into the vagina.
Wear Breathable Fabrics
Trapped heat and moisture create conditions that help unwanted bacteria multiply. Cotton underwear wicks away excess sweat and moisture far better than synthetic fabrics. According to Cleveland Clinic, 100% cotton is the best choice. Underwear made from synthetic material with just a cotton crotch panel doesn’t fully protect you and won’t breathe the same way. Sleeping without underwear or in loose-fitting shorts can also help keep the area dry overnight.
Check Your Vitamin D Levels
Low vitamin D appears to be a meaningful risk factor for BV. A large analysis of U.S. women from the National Health and Nutrition Examination Survey found that for every small increase in blood vitamin D levels, BV risk dropped incrementally. The protective effect was strongest in women whose levels were below 63.1 nmol/L (about 25 ng/mL). Above that threshold, additional vitamin D didn’t offer much extra benefit.
If you’re dealing with recurrent BV, it’s worth asking your doctor to check your vitamin D level. Many women are deficient, especially those with darker skin tones, limited sun exposure, or diets low in fatty fish and fortified foods. Getting your levels into a sufficient range won’t cure BV on its own, but it removes one contributing factor.
Probiotics: Helpful but Not a Cure
The idea of replenishing good bacteria with a supplement makes intuitive sense, but the evidence is mixed. The most studied strains for vaginal health are Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14, typically taken orally at a dose of at least 1 billion colony-forming units per day. A clinical trial using this combination as an add-on to antibiotic treatment, however, found that it did not increase the cure rate compared to antibiotics alone.
That doesn’t mean probiotics are worthless. Some women find them helpful as part of a broader prevention strategy, and the strains do colonize the vaginal tract after oral use. But a probiotic supplement alone is unlikely to keep BV away if other risk factors remain. Think of it as one layer of protection, not the primary one.
Boric Acid for Stubborn Cases
Boric acid vaginal suppositories have become popular for preventing BV recurrence, and there’s some clinical basis for using them, particularly in combination with antibiotics for resistant or recurring infections. The CDC includes boric acid as part of a multi-step protocol for recurrent BV: a course of antibiotics, followed by 600 mg of vaginal boric acid daily for 21 days, then maintenance antibiotic gel twice weekly for several months. That specific regimen brought recurrence rates down to about 30% at six months, which is notably better than antibiotics alone.
Over-the-counter boric acid suppositories are widely available, but it’s worth noting that commercially available formulations haven’t all been tested to confirm they deliver on their claims. Burns are not expected with daily use but are possible. Boric acid should never be taken orally and should not be used during pregnancy.
Maintenance Therapy for Recurring BV
If you’ve had multiple episodes despite lifestyle changes, your doctor may recommend suppressive therapy. The CDC notes that using a vaginal antibiotic gel twice weekly for three or more months can reduce recurrences, though the benefit typically stops once you discontinue treatment. The multi-step approach combining antibiotics, boric acid, and then suppressive gel for four to six months currently has the best evidence for breaking the cycle of recurrence.
This kind of extended treatment isn’t usually the first thing a provider will suggest, but if you’re on your third or fourth round of BV in a year, it’s a reasonable conversation to have. The goal is to keep harmful bacteria suppressed long enough for a healthy microbiome to reestablish itself.
Daily Habits That Add Up
No single change prevents BV on its own. The women who successfully break the recurrence cycle tend to stack multiple small protections together:
- Condoms during sex to keep semen from raising vaginal pH
- No internal washing or douching of any kind
- Cotton underwear and breathable clothing during the day
- Menstrual cups or frequently changed tampons during your period
- Adequate vitamin D, aiming for blood levels above 25 ng/mL
- pH-friendly lubricants free of glycerin and fragrances
Each of these individually might seem minor. Together, they create an environment where protective bacteria can do their job and where the conditions that trigger BV are far less likely to develop.