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Do Probiotics Make You Taste Better? What No Trial Has Measured
In this article
No trial has ever measured whether live cultures change how a woman tastes, and none has measured wetness or lubrication either, so no capsule can honestly claim it and no UK label is allowed to.1 What the vaginal trials did measure is narrower: the lactobacillus count and Nugent score, vaginal pH, whether bacterial vaginosis (BV) came back after antibiotics (14.8% against 25.5% in ten trials of 1,234 women), the add-on to antifungals for thrush, a null result for urinary infections and, in one trial, the amount and smell of discharge.2, 3 The faintly sour taste of a healthy vagina is chemistry the trials did count: lactobacilli hold it at about pH 3.5 with roughly 1% lactic acid, the acid that makes yoghurt sour.4 This page sits in the Wellgard guide to what causes BV; smell has its own page, what probiotics make your vagina smell better?
Evidence at a glance
- Trials: ten randomised trials pooled in 2022 (1,234 women) measured BV recurrence after antibiotics; one 3-month trial (89 women with BV) measured the amount and smell of discharge; none measured taste or wetness.2, 3
- Largest single trial: 544 women with a vaginal infection, oral two-strain capsules or placebo for 6 weeks; a balanced flora in 61.5% against 26.9% at about 44 days.5
- Strongest measured outcome: BV recurrence of 14.8% with live cultures after antibiotics against 25.5% without (relative risk 0.55).2
- Not tested: taste, lubrication or arousal, in any trial of live cultures.
Sources checked on 16 October 2026.
Do probiotics make you taste better? What the question is really asking
"Probiotic" is the word people search; the trials are of live cultures, and taste has never been one of their outcomes. No trial has asked a woman or a partner to score it, and no UK label may claim it.1 What the trials did measure is what most plausibly sits behind the question: acidity. In 56 healthy women whose vaginal flora was dominated by lactobacilli, the average pH was 3.5 (range 2.8 to 4.2) and the fluid held about 1% lactic acid; two of the study's authors worked for a company developing vaginal products.4 Lactic acid is sour, which is why a healthy vagina tastes and smells faintly tangy. A fishy smell is BV until a swab says otherwise, and the NHS says BV "is usually treated with antibiotic tablets or gels or creams" from a GP or sexual health clinic.6
So the answerable question is whether live cultures leave more lactobacilli in the vagina, and that has been measured. In 72 postmenopausal women with an intermediate flora, 14 days of an oral two-strain capsule improved the Nugent score by at least two grades in 60%, against 16% on placebo.7 Whether a woman with more lactobacilli tastes different, nobody has asked. Route (capsule or pessary) and the species-by-species evidence are on are probiotics good for your vagina?; what is the best probiotic for my vagina? explains what a vaginal live-culture capsule is for.
Do probiotics make you wetter?
No trial has measured lubrication or arousal with live cultures. "Wetter" also means everyday discharge, and that is measured. The NHS describes normal discharge as clear or white, thick and sticky or slippery and wet, "often clearer and wetter" around ovulation, and heavier in pregnancy, if you are sexually active or if you are using birth control.8 Two trials touched discharge amount and went opposite ways: in a 2021 safety review of live cultures in pregnancy, one trial reported more discharge in women taking two lactobacillus strains (relative risk 3.67), while the 3-month trial in 89 women with BV reported less, with no figures and a manufacturer among its authors.9, 3 Neither is about arousal. Dryness is a separate question, usually the fall in oestrogen after the menopause; vaginal dryness: what helps at any age covers it.
What did the vaginal trials of live cultures measure?
| Outcome | What the trials found | Trials and people |
|---|---|---|
| BV coming back after antibiotics2 | 14.8% against 25.5%, relative risk 0.55; route, dose, days and number of species made no measurable difference | 10 trials, 1,234 women |
| Lactobacillus count and Nugent score7 | Nugent score improved by two grades or more in 60% against 16% on placebo after 14 days of oral capsules | 1 trial, 72 postmenopausal women |
| Thrush, added to antifungal treatment10 | Short-term clinical cure relative risk 1.14 and fewer relapses at one month (0.34); no benefit at three months; low to very low certainty | 10 trials, 1,656 women |
| Recurrent urinary infections11 | Relative risk 0.82, not statistically significant; the authors said a benefit could not be ruled out | 9 trials, 735 people |
| Amount and smell of discharge3 | Both improved against placebo over 3 months; no figures in the summary; one author at a manufacturer | 1 trial, 89 women with BV |
| Taste | Not measured in any trial | None |
| Wetness or lubrication | Not measured; discharge amount reported in two trials, in opposite directions | 2 trials |
Every measured outcome is a laboratory grade or a diagnosis in women who had BV or thrush and were treated for it; the figures are evidence for live cultures after treatment, never a result for a particular product.
Do probiotics make you smell better or worse?
For the vagina, one 3-month trial reported less smell without giving figures, and the firmer evidence is the recurrence figure above; which smell is which, and when a smell needs a swab, is on what probiotics make your vagina smell better?3, 2 The other two smell questions have no trials at all. No study has tested whether live cultures change the smell of urine; the NHS lists "dark yellow, strong-smelling pee" as a sign of dehydration, and a new smell with pain or needing to pee more often is a urinary-infection question for a pharmacist, who the NHS says "can give the same medicines as a GP".12, 13 And live-culture capsules often smell sour or yeasty when opened: that is what fermented cultures smell like, and no study connects a capsule's smell to how many live cells it holds; the label's storage instruction and best-before date are the things to go by.
Who should take care
In the trials, serious side effects were no more common than with placebo (relative risk 0.80 in the two thrush trials that counted them); mild stomach symptoms and more discharge were reported in some.10, 9 Anyone with a weakened immune system, a central venous line or a serious illness asks a pharmacist or GP first, as does anyone pregnant, breastfeeding or on medication.14 A new, strong or persistent smell, pain, bleeding or a change in discharge is a GP or sexual health clinic matter.6
What we don't know
- No trial has asked a woman or her partner to rate taste before and after live cultures, so there is nothing to report either way.
- No trial has measured lubrication or arousal with live cultures.
- The one trial that measured smell published no percentages, and a manufacturer was among its authors.
- No study has tested whether what you eat changes how you taste.
Frequently asked questions
Are there pills that make you taste good down there?
None has been tested, and no UK label may claim it.1 A label can state the species, the count and the date it is guaranteed to, and nothing about taste; what is the best probiotic for my vagina? reads a label line by line.
Do cranberry pills make you taste better?
No trial has measured it. Cranberry's evidence is for recurrent urinary infections: in the 2023 Cochrane review, cranberry products reduced symptomatic UTIs in women with recurrent infections (relative risk 0.74, 8 trials, 1,555 women).15
Why does my discharge taste or smell sour after starting live cultures?
Sour is the lactic acid of a lactobacillus-dominated flora, measured at about pH 3.5 and 1% lactic acid in healthy women, and it is the normal state.4 Fishy is BV until a swab says otherwise.6
Does pineapple or anything else you eat change how you taste?
No study has tested it, for pineapple or anything else.
Can probiotics make your urine smell?
No study has measured it. Dark, strong-smelling pee is the NHS's sign of dehydration; a smell with pain or needing to go more often is a UTI question for a pharmacist or GP.12, 13
Sources
- Department of Health and Social Care. Great Britain nutrition and health claims register (no authorised health claim for any live culture). Updated 19 May 2026. gov.uk.
- 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. Pooled analysis of 10 trials, 1,234 women; no commercial funding declared. PubMed 36204368.
- Mändar R, et al. Impact of Lactobacillus crispatus-containing oral and vaginal probiotics on vaginal health: a randomised double-blind placebo controlled clinical trial. Beneficial Microbes, 2023. Randomised trial, 89 women with BV and 93 with thrush, 3 months; one author at a manufacturer. PubMed 36856121.
- O'Hanlon DE, Moench TR, Cone RA. Vaginal pH and microbicidal lactic acid when lactobacilli dominate the microbiota. PLoS One, 2013. Observational, 56 women, 64 samples; two authors employed by a company developing vaginal products. PubMed 24223212.
- 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. Randomised trial, 544 women, 6 weeks; funding not checked. PubMed 23395559.
- NHS. Bacterial vaginosis. Page last reviewed 19 June 2026. nhs.uk/conditions/bacterial-vaginosis.
- Petricevic L, et al. European Journal of Obstetrics & Gynecology and Reproductive Biology, 2008. Randomised trial, 72 postmenopausal women, 14 days; funding not checked. PubMed 18701205.
- NHS. Vaginal discharge. Page last reviewed 15 February 2024. nhs.uk/conditions/vaginal-discharge.
- Sheyholislami H, Connor KL. Are probiotics and prebiotics safe for use during pregnancy and lactation? A systematic review and meta-analysis. Nutrients, 2021. Systematic review, 11 studies with adverse-effect data; no conflict of interest declared. PubMed 34371892.
- Xie HY, et al. Probiotics for vulvovaginal candidiasis in non-pregnant women. Cochrane Database of Systematic Reviews, 2017. Pooled analysis of 10 trials, 1,656 women; no industry funding in any trial. PubMed 29168557.
- Schwenger EM, Tejani AM, Loewen PS. Cochrane Database of Systematic Reviews, 2015. Pooled analysis of 9 trials, 735 people. PubMed 26695595.
- NHS. Dehydration. Page last reviewed 1 May 2026. nhs.uk/conditions/dehydration.
- NHS. Urinary tract infections (UTIs). Page last reviewed 11 July 2025. nhs.uk/conditions/urinary-tract-infections-utis.
- Doron S, Snydman DR. Risk and safety of probiotics. Clinical Infectious Diseases, 2015. Narrative review. PubMed 25922398.
- Williams G, et al. Cochrane Database of Systematic Reviews, 2023. Pooled analysis of 50 trials, 8,857 people. PubMed 37068952.
General information, not medical advice. Live cultures are a food supplement, not a treatment; antibiotics and antifungals are the treatments for BV and thrush.
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