The short answer
Probiotics do reduce recurrences of bacterial vaginosis: by 45% in the most robust meta-analysis. But the same analysis shows that the effect is linked neither to the number of strains nor to the total CFU dose. In other words, the two arguments that sell these products do not predict the result. Among the products recorded, the cheapest costs 0.63 EUR a day, but with no strain code; the cheapest with identified strains, 0.66 EUR, against 1.33 EUR for an equivalent dose.
The race for billions of CFU is not supported by the data
Every box displays its figure: 10 billion, 12, 60. The implicit logic is that a higher number is better. That is not what the trials show.
A systematic review with meta-analysis of 10 randomised trials and 1,234 participants measured a 45% reduction in bacterial vaginosis recurrences: 14.8% recurrence against 25.5% on placebo or metronidazole alone (relative risk 0.55; 95% confidence interval: 0.33 to 0.91; p = 0.03). The effect is robust: it holds after removing studies at high risk of bias (Chieng et al., Frontiers in Nutrition, 2022, PMID 36204368).
And here is the part the product pages never quote. The meta-regression of this same study tested four variables, and none is linked to the result:
| What brands promote | Link with the measured effect |
|---|---|
| Number of strains in the formula | none (p = 0.40) |
| Total CFU dose | none (p = 0.17) |
| Cumulative duration of use | none (p = 0.76) |
| Oral or vaginal route | none (p = 0.44 and 0.67) |
Practical consequence: paying more for 60 billion CFU rather than 10 has no justification in this data, and a nine-strain formula has not been shown to be better than a four-strain one. What remains as selection criteria is the price per day and the identity of the strains.
Why the strain matters, even if the number does not
This is not contradictory. The meta-analysis says that the number of strains does not explain the effect; it does not say that any strain will do. The trials were run on specific strains, identified by a code, not on “lactobacilli” in general.
For vaginal flora in particular, Lactobacillus crispatus is the strain whose dominance characterises a balanced vaginal microbiome, and it is an active line of research. A product sold for intimate comfort that contains no strain studied for that purpose is selling a generic probiotic.
The rule for reading a label: a strain is named in three parts: the genus, the species and the strain code. “Lactobacillus rhamnosus LGG®” is an identifiable strain, on which you can look for trials. “Lactobacillus rhamnosus” on its own is not. If the label stops at the species, no data can be verified.
The products, recorded on 24/09/2026
| Product | Strains named | CFU / day | Price | Cost per day |
|---|---|---|---|---|
| Nutrimea, Probiotiques Flore Intime | 3 species, including L. crispatus, no strain code | 24 billion | 18.90 EUR / 60 caps. | 0.63 EUR |
| Nutri&Co, Probiotique Flore Intime | 6, including L. crispatus CCFM1110 | 12 billion | 19.90 EUR / 60 caps. | 0.66 EUR |
| Dynveo, Probio4 (60 caps.) | 4, all trademarked: LGG, BB-12, LA-5, LRC | 10 billion guaranteed | 39.90 EUR / 60 caps. | 1.33 EUR |
| Nutri&Co, Probiotiques & prébiotiques | 9, digestion-oriented | 60 billion | 27.90 EUR / 60 caps. | 1.40 EUR |
| Dynveo, Probio4 (28 caps.) | 4, identical to the 60 size | 10 billion guaranteed | 24.90 EUR / 28 caps. | 1.78 EUR |
Three ways to read this table.
1. The two cheapest products are the two specific formulas. Nutrimea, at 0.63 EUR a day, and Nutri&Co, at 0.66 EUR, cost half as much as Dynveo’s general-purpose complex, and they are the only two to contain L. crispatus. But Nutrimea gives only the species, with no strain code: by the rule above, no data can be verified. Nutri&Co names its strain, CCFM1110, for 3 cents more a day. Over a three-month course, the gap reaches 60 EUR.
2. The small size costs 34% more. At Dynveo, the box of 28 capsules works out at 1.78 EUR a day against 1.33 EUR for the one of 60. It is the usual trade-off with supplements: the trial size is paid for.
3. The 60 billion CFU do not translate into better value. The digestion complex displays five times more CFU than Probio4 and costs roughly the same per day, but its box lasts only twenty days, because you need three capsules. CFU are not free, they are simply not predictive.
What really sets these products apart
Strain traceability. Probio4 names its four strains under trademark (LGG, BB-12, LA-5, LRC), which makes it possible to find the published trials on each one. This is the strong point of this product, and it is worth more than its CFU count.
The gastro-resistant capsule. Dynveo uses DRcaps® capsules presented as resistant to stomach acid. The argument is logical (a bacterium destroyed in the stomach does not reach the gut), but the meta-regression is a reminder that even the route of administration was not linked to the effect. Take it as a plus, not a deciding criterion.
Added prebiotics. Probio4 contains inulin, a fibre that feeds bacteria. Useful in principle; its contribution in a capsule remains marginal compared with what food provides. Our guide to dietary fibre puts the quantities in perspective.
What a probiotic does not replace
A network meta-analysis published in 2026 on preventing vaginosis recurrences compared several strategies, and two stand out with a moderate level of evidence: treating the partner (24% reduction in the recurrence rate, IRR 0.76) and acidifying agents as consolidation therapy (relative risk 0.22) (Gardella et al., Journal of Lower Genital Tract Disease, 2026, PMID 42611724).
In other words, a probiotic is part of a care plan, it is not the plan. Vaginosis is diagnosed and treated medically: this comparison is about preventing recurrences, not treating an episode. Our guide to probiotics and the microbiome explains what these products do and do not do.
Looking instead for a probiotic for diarrhoea, notably when taking antibiotics? Read our guide Ultra-Levure: probiotic or medicine?
When should you take your probiotic? Our study-based guidance: probiotics, morning or evening.
Our sources
- Official Nutri&Co and Dynveo pages, consulted on 24/09/2026: strains, CFU, doses, sizes and prices. Nutripure blocks automatic reading of its product pages and is therefore not compared.
- Chieng W.K. 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: PMID 36204368.
- Gardella B. et al., Rethinking Prevention of Recurrent Bacterial Vaginosis: A Comparative Effectiveness Network Meta-Analysis, Journal of Lower Genital Tract Disease, 2026: PMID 42611724.