Can I Get Rid of BV by Taking Probiotics? What Ten Trials Found

No. Bacterial vaginosis is treated with antibiotics prescribed by a GP or sexual health clinic, and no live-culture capsule replaces them. Where live cultures (the capsules sold as probiotics) have evidence is afterwards: in a 2022 meta-analysis of ten randomised trials with 1,234 women, those who took live cultures after a course of antibiotics had a BV recurrence rate of 14.8%, against 25.5% without them (relative risk 0.55).^{1, 2} Taken instead of antibiotics, the three trials that tried it were inconclusive (relative risk 1.12, 95% confidence interval 0.60 to 2.07), and the 2009 Cochrane review found insufficient evidence for or against.^{3, 4} This is one spoke of our guide to what causes BV and why it returns.

Can I take probiotics if I have bacterial vaginosis?

Yes, and in the trials they were taken alongside or after the antibiotic course, never in place of it. In the first, 125 Nigerian women with BV took a week of oral metronidazole and, for 30 days, either a capsule of two specific lactobacillus strains (1 billion of each, twice a day) or a placebo: 88% of the live-culture group met the study's laboratory definition of resolution at day 30, against 40% with antibiotics alone.⁵ Pooling 14 trials in 2022, about a quarter more women met the resolution definition when live cultures were added to antibiotics (relative risk 1.23).³ Spacing the capsule a few hours from the antibiotic dose is the usual advice; how long after antibiotics to take live cultures covers timing and how to take women's live cultures daily use. In pregnancy, speak to a GP or midwife first: a UK trial of 304 pregnant women taking an oral two-strain capsule daily until delivery found no safety problems and no significant difference in BV from placebo.⁶

Do probiotics help bacterial vag?

"Bacterial vag" is how many women type it, and the answer depends on the outcome. For clearing an active episode, the medicine is the antibiotic; live cultures were the add-on. For the laboratory picture, the largest oral trial gave 544 Croatian women one two-strain capsule a day for six weeks with no antibiotic: a normal lactobacillus-dominated smear was restored in 61.5% against 26.9% at six weeks and 51.1% against 20.8% at twelve, a cytology endpoint from a manufacturer's product, not a symptom outcome.⁷ For recurrence, the outcome women ask about most, the ten-trial figure is the one to hold. Are live cultures good for your vagina? covers the thrush and general evidence, and how women's live cultures help the wider questions.

After antibiotics versus instead of them: two different questions

Instead of antibiotics, the evidence is thin and the direction unclear: three trials, relative risk 1.12 (0.60 to 2.07), and a Cochrane verdict of "insufficient evidence for or against".^{3, 4} The NHS position is that BV is treated with antibiotic tablets, gel or cream from a GP or sexual health clinic.² After antibiotics, the reviews point the same way: the ten-trial meta-analysis gave a relative risk of 0.55 for recurrence; an 11-trial review of antibiotics plus vaginal lactobacilli gave 0.62 at 12 to 16 weeks; and a 2026 network meta-analysis rated vaginal live cultures after antibiotics at 0.37 (moderate certainty) and oral at 0.45 (low certainty).^{1, 8, 9} One 2026 review of eight trials of vaginal lactobacillus tablets (562 women) found no effect (relative risk 0.86), so the two 2026 reviews disagree on the vaginal route.¹⁰ A post-hoc analysis of the 2020 NEJM trial of a vaginal L. crispatus product explains the pattern: the benefit appeared only in women whose antibiotics had worked (relative risk 0.56), not in women still positive afterwards (1.34).^{11, 12} Why BV returns at all, and the plan for it, is Why do I keep getting BV?

What the ten-trial figure means (14.8% vs 25.5%)

Picture 100 women who have just finished antibiotics for BV. Without live cultures, about 25 had BV again by the time the trials checked, at least one cycle later and in most trials about a month; with live cultures after the course, about 15 did. That is roughly ten fewer women in every hundred, a relative risk of 0.55 (0.33 to 0.91), and the result held when high-bias trials were removed (0.54).¹ The meta-regression found no link between the effect and the route, daily dose, duration or number of species, so there is no count that works and none that does not. The ten trials gave 1.0 to 5.4 billion live cultures a day by mouth for 8 to 60 days of use, and recurrence was checked at least one cycle after the antibiotics, so nothing here supports a result inside a fortnight.¹ And the figure is an average across groups of women, not a promise to any one of them. How many live cultures to take a day and how long they take to work cover counts and timing.

Oral or vaginal, and which species the trials used

Almost every oral trial used the same pair: two specific lactobacillus strains, studied as a pair and developed together, sold under a trade name we do not use here, at 1 to 2.5 billion of each per dose.^{5, 6, 7} The vaginal trials used chiefly Lactobacillus crispatus, the species that dominates the most protective healthy vaginas; the 2020 NEJM trial gave 228 women a vaginal L. crispatus product for 11 weeks after antibiotic gel and recorded recurrence of 30% against 45% at 12 weeks, though that product is a prescription-track medicine.¹¹ The data rank neither route above the other, so the choice is about what you will use consistently. The species in a capsule are a fact to read on the label; how to read a women's live-culture label and how to choose a women's live-culture supplement are the label-reading pages.

What a women's live-culture capsule usually contains

A women's live-culture capsule states a count in billions of live cultures and the one to three named strains it holds, taken as one capsule a day; in ten trials of 1,234 women, live cultures taken after a course of antibiotics were associated with BV recurrence of 14.8% against 25.5%, a figure reported here as evidence for live cultures after treatment, not as a result for any one product.¹ Those trials used 1.0 to 5.4 billion live cultures a day by mouth, and the meta-regression found no link between dose and outcome, so a higher count on a label is a fact about the capsule, not a reason to expect more. No live-culture product in Great Britain carries an authorised health claim; labels say to consult a GP if pregnant, breastfeeding or on medication.

Who should take care

Live cultures have a good safety record in the BV, thrush and pregnancy trials, with no serious adverse events attributed to them.^{6, 13} The caution for every live-culture product is for people with a weakened immune system, a central venous line or a serious illness, in whom rare bloodstream infections with the capsule organisms have been reported: review with a pharmacist or GP before starting.¹³ In pregnancy, the trials report no safety problems and no benefit, so the conversation is with a midwife. Mild bloating in the first days is common and settles; what happens when you start women's live cultures covers it, and what are probiotics has the general safety picture.

Frequently asked questions

Why do I keep getting BV even though I take probiotics?

Because the trials show fewer recurrences, not none: 14.8% of women still had BV back with live cultures.¹ Check the measured triggers (the same partner, periods, douching, a copper coil, smoking), ask a sexual health clinic about partner treatment, and for more than four episodes a year the NHS offers a longer course of vaginal antibiotic gel.²

What are the signs a vaginal probiotic is working?

Nothing you can feel. The trials measured a lactobacillus-dominated smear at 6 and 12 weeks and recurrence at least one cycle after the antibiotics, so the only sign is BV not returning; a change in discharge, smell or itching meanwhile is a reason to be swabbed.^{1, 7}

Does eating yoghurt or fermented foods help?

A few trials have tested yoghurt for BV, but the ten-trial analysis left food out; it pooled capsules, sachets and pessaries of named strains.¹ Fermented foods are a fine part of a diet; nothing food-based belongs inside the vagina, and vaginal yoghurt has only small, old trials and can irritate.

Does taking probiotics cause more discharge?

Not in the trials, which did not report it as an adverse effect. A new or changed discharge, especially with a smell or itch, is thrush, BV or an STI until a swab says otherwise; vaginal thrush covers the first.

Sources

1. Chieng WK, et al. 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. PubMed 36204368.
2. NHS. Bacterial vaginosis. nhs.uk/conditions/bacterial-vaginosis.
3. Chen R, et al. Probiotics are a good choice for the treatment of bacterial vaginosis: a meta-analysis of randomized controlled trial. Reproductive Health, 2022. PubMed 35698149.
4. Senok AC, et al. Probiotics for the treatment of bacterial vaginosis. Cochrane Database of Systematic Reviews, 2009. PubMed 19821358.
5. Anukam K, et al. Augmentation of antimicrobial metronidazole therapy of bacterial vaginosis with an oral two-strain lactobacillus capsule: randomized, double-blind, placebo controlled trial. Microbes and Infection, 2006. PubMed 16697231.
6. Husain S, et al. Effects of oral probiotic supplements on vaginal microbiota during pregnancy: a randomised, double-blind, placebo-controlled trial with microbiome analysis. BJOG, 2020. PubMed 30932317.
7. Vujic G, et al. Efficacy of orally applied probiotic capsules for bacterial vaginosis and other vaginal infections: a double-blind, randomized, placebo-controlled study. European Journal of Obstetrics, Gynecology and Reproductive Biology, 2013. PubMed 23395559.
8. Ma S, et al. Antibiotics therapy combined with probiotics administered intravaginally for the treatment of bacterial vaginosis: a systematic review and meta-analysis. Open Medicine, 2023. PubMed 37724125.
9. Gardella B, et al. Rethinking prevention of recurrent bacterial vaginosis: a comparative effectiveness network meta-analysis. Journal of Lower Genital Tract Disease, 2026. PubMed 42611724.
10. Awasthi Y, et al. Lactobacillus vaginal tablets and recurrence of bacterial vaginosis: a systematic review and meta-analysis. Probiotics and Antimicrobial Proteins, 2026. PubMed 42234392.
11. Cohen CR, et al. Randomized trial of a vaginal Lactobacillus crispatus live biotherapeutic for recurrence of bacterial vaginosis. New England Journal of Medicine, 2020. PubMed 32402161.
12. Hemmerling A, et al. Response to antibiotic treatment of bacterial vaginosis predicts the effectiveness of a vaginal Lactobacillus crispatus live biotherapeutic in recurrent disease. Sexually Transmitted Diseases, 2024. PubMed 38733973.
13. Doron S, Snydman DR. Risk and safety of probiotics. Clinical Infectious Diseases, 2015. PubMed 25922398.

This article is general information, not medical advice. Bacterial vaginosis is diagnosed and treated by a GP or sexual health clinic; if you have a weakened immune system or a serious illness, ask a pharmacist or GP before taking live cultures. Food supplements are not a substitute for a varied diet and healthy lifestyle.