The claim

“Vaginal probiotics can help prevent recurrent bacterial vaginosis.”

It depends

Evidence confidence Moderate

A placebo-controlled trial found fewer BV recurrences with one defined L. crispatus formulation after antibiotic treatment. This supports a product-specific benefit, but one formulation and limited follow-up cannot establish the same effect for every probiotic or long-term use.

The facts

One trial found that a specific vaginal L. crispatus product reduced BV recurrence after metronidazole: about 30% had recurrence by 12 weeks versus 45% with placebo. Both groups first received antibiotics. These results do not apply automatically to store-bought probiotics.

Who should be careful?

Safety note: Do not use recurrence-prevention evidence to self-treat an active infection. Returning symptoms need reassessment, especially during pregnancy.

Talk to a healthcare professional if: If symptoms return, confirm the cause with a clinician and review prevention options after treatment.

What this means for you

The exact product and treatment sequence matter. A supplement listing the same species may not match the formulation tested in the trial.

Your next step

If BV keeps returning, ask your clinician about prevention options and what evidence supports any proposed product.

Sources

•Cohen CR, Wierzbicki MR, French AL, et al. Randomized Trial of Lactin-V to Prevent Recurrence of Bacterial Vaginosis. New England Journal of Medicine. 2020;382(20):1906-1915. DOI: 10.1056/NEJMoa1915254

•van de Wijgert JHHM, Verwijs MC. Lactobacilli-containing vaginal probiotics to cure or prevent bacterial or fungal vaginal dysbiosis: a systematic review and recommendations for future trial designs. BJOG. 2020;127(2):287-299. DOI: 10.1111/1471-0528.15870

•US Centers for Disease Control and Prevention. Bacterial Vaginosis. Sexually Transmitted Infections Treatment Guidelines, 2021

Last reviewed 2026-10-01 Suggest a correction →

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Bottom line on Vaginal probiotics

Vaginal probiotics aren't a myth, but they're not a cure-all either, they may help prevent recurring BV for some people, and they're not your go-to for an active yeast infection.