“Vaginal probiotics prevent recurrent bacterial vaginosis.”
One vaginal probiotic not yet on sale cut BV recurrence in a strong trial, but more widely tested products have not shown a clear benefit.
Store-bought vaginal probiotics have not been shown to keep BV from coming back, and the one product that worked in a strong trial is not on the market yet. For repeat BV, start with your clinician's proven options and treat any probiotic as an optional extra at most.
If BV keeps coming back, ask your clinician about a prevention plan and whether any probiotic product has trial evidence behind it.
Safety note: BV that is not treated is linked with a higher chance of getting sexually transmitted infections, including HIV, and with complications in pregnancy, so a probiotic should not replace treatment of an active infection.
Talk to a healthcare professional if: your BV symptoms keep coming back, or you are pregnant and have unusual discharge, odor or irritation.
One strong placebo-controlled trial found that a single vaginal probiotic, used after antibiotics, cut BV recurrence by about a third, but that product is not sold, and a 2026 review of 8 trials of lactobacillus vaginal tablets found no clear drop in recurrence. That real but narrow effect is much smaller than the claim suggests, and confidence is limited because the trials are few, mostly small and use different products.
One vaginal probiotic not yet on sale cut BV recurrence in a strong trial, but more widely tested products have not shown a clear benefit. In that trial, after antibiotics, BV returned by 12 weeks in 30% of women using the probiotic and 45% of women using a placebo. In a 2026 review of 8 trials with 562 women, lactobacillus vaginal tablets did not clearly lower recurrence.
BV often comes back after antibiotics. The trial product, Lactin-V, contains one strain, Lactobacillus crispatus CTV-05, and was used for 11 weeks after vaginal metronidazole; the benefit was smaller but still present at 24 weeks, and side effects were similar to placebo. A 2022 review that pooled 10 trials of oral and vaginal products after antibiotics found fewer recurrences (about 15% vs 26%), but it mixed routes, products and comparison treatments, so its result cannot be pinned to any store product. Whether a probiotic can treat an active case on its own is a separate question with its own card.
The product with the best evidence, Lactin-V, was still being tested in 2026 and is not sold in stores. Products on shelves may contain different strains and amounts from those tested. For women whose BV keeps coming back, the US treatment guideline describes metronidazole gel used twice a week for more than 3 months as an option that reduces repeat episodes, although the benefit fades after it is stopped.
- Cohen CR, Wierzbicki MR, French AL, Morris S, Newmann S, Reno H, Green L, Miller S, Powell J, Parks T, Hemmerling A. 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. PMID: 32402161. PMCID: PMC7362958
- Awasthi Y, Bangar S, Boopalan D, Karuppiah M, Ponnaiah M. Lactobacillus Vaginal Tablets in Preventing Recurrence of Bacterial Vaginosis: A Systematic Review and Meta-Analysis. Probiotics and Antimicrobial Proteins. 2026 (online ahead of print). DOI: 10.1007/s12602-026-11026-6. PMID: 42234392
- Chieng WK, Abdul Jalal MI, Bedi JS, Zainuddin AA, Mokhtar MH, Abu MA, Chew KT, Nur Azurah AG. Probiotics, a promising therapy to reduce the recurrence of bacterial vaginosis in women? a systematic review and meta-analysis of randomized controlled trials. Frontiers in Nutrition. 2022;9:938838. DOI: 10.3389/fnut.2022.938838. PMID: 36204368. PMCID: PMC9530327
- Workowski KA, Bachmann LH, Chan PA, Johnston CM, Muzny CA, Park I, Reno H, Zenilman JM, Bolan GA. Sexually Transmitted Infections Treatment Guidelines, 2021. MMWR Recommendations and Reports. 2021;70(4):1-187. DOI: 10.15585/mmwr.rr7004a1. PMID: 34292926
- Contemporary OB/GYN. Phase 2b trial testing Lactin-V for preterm birth prevention. May 13, 2026