# Vaginal Probiotics

- Page: https://www.carewithki.com/en/discover/vaginal-probiotics
- Published: 26 June 2026
- Topics: Vaginal Health
- Topic page: Vaginal Health and Intimate Care https://www.carewithki.com/en/discover/topic/vaginal-health
- Publisher: care with .ki (content principles: https://www.carewithki.com/en/editorial-policy)

![Vaginal Probiotics](https://www.carewithki.com/blog/vajinal-probiyotikler.jpg)

> Women's health and the reproductive system host a vast ecosystem at the microscopic level. Just like our gut, the vaginal area has its own dynamic microbiota. "We know about gut probiotics, but what is a vaginal probiotic, and does it really work?"

## Guardians of the Vaginal Environment: Vaginal Probiotics and Specific Bacterial Strains From a Pharmacist's Point of View

Women's health and the reproductive system host a vast ecosystem at the microscopic level. Just like our gut, the vaginal area has its own dynamic microbiota. "We know about gut probiotics, but what is a vaginal probiotic, and does it really work?"

In this article, we'll take a close look at the "vaginal environment" and, based on clinical studies and with scientific sources, set out which bacterial strains play which specific roles in women's health.

## 1. What Is a Vaginal Probiotic and What Is It Used For?

Vaginal probiotics are supplements containing live, selected friendly microorganisms, used to restore or protect the natural balance (eubiosis) of the vaginal ecosystem.

Bacteria of the genus Lactobacillus make up 70–90% of a healthy vaginal microbiota. These friendly bacteria break down glycogen to produce lactic acid, keep the pH of the environment acidic (3.8–4.5) and, by releasing hydrogen peroxide, stop harmful pathogens (fungi and bacteria) from taking hold.

### What Is It Used For?

- Preventing Bacterial Vaginosis (BV) and Thrush (Candida): When the lactobacillus population decreases because of antibiotic use, stress or wrong hygiene habits, "dysbiosis" (disrupted flora) develops. Probiotics restore this balance.
- Preventing Recurrent Infections: Used after treatment of an acute infection (antibiotic/antifungal) has ended, to support the flora and prevent the infection from coming back.
- Protecting Urogenital Health: Plays a supportive role in urinary tract infections (UTIs) and [vaginal dryness](https://www.carewithki.com/en/discover/why-intimate-care-needs-change-during-menopause)/irritation.

## 2. Why Does the Concept of a "Strain" Matter in Women's Health?

With probiotics, the "species" (e.g. Lactobacillus rhamnosus) alone isn't enough; you should look for the "strain" code (e.g. GR-1). That's because each bacterial strain's mechanism of action in the body and clinical success are completely different. One strain may be good for gut health, while another is able to adhere to the vaginal mucosa.

Let's look at the major strains whose effectiveness in women's health is best proven by clinical studies, and what they do:

### A. Lactobacillus rhamnosus (GR-1) and Lactobacillus reuteri (RC-14)

These two strains are the combination with the most clinical research in the field of women's health in the literature.

- Mechanism of Action: Even when taken orally (by mouth), they have been clinically shown to pass through the intestinal tract and colonise (settle in) the vaginal area. They prevent pathogens from sticking to the cell wall and break up biofilm formation.
- Clinical Indication: They are used as strong support alongside medical treatment for recurrent bacterial vaginosis and vaginal thrush (Candida).

### B. Lactobacillus gasseri (EB01 / LN40)

- Mechanism of Action: One of the most dominant native species of the vaginal flora. It can produce very large amounts of lactic acid.
- Clinical Indication: Helps vaginal pH return to normal quickly. In particular, it creates a protective shield by quickly bringing flora disrupted after antibiotic treatment back to the acidic phase.

### C. Lactobacillus crispatus (CTV-05 / LbV 88)

- Mechanism of Action: Scientific research shows that women whose flora is dominated by L. crispatus have a much lower risk of vaginal infections. It is one of the strains with the highest hydrogen peroxide secretion.
- Clinical Indication: Considered the gold standard in the prophylaxis (preventive treatment) of chronic, stubborn, recurrent urogenital infections.

## 3. Oral (By Mouth) or Vaginal (Local)?

In women's health, probiotics come in two forms: capsules/sachets (oral) and vaginal pessaries/tablets.

- Vaginal Forms: Applied directly to the area. Chosen when a fast-acting mechanism is wanted (for example, at the end of acute thrush treatment) to quickly dominate the local microbiota.
- Oral Forms: Use the gut-vagina axis. Friendly bacteria migrate from the gut to the rectum and from there, thanks to anatomical proximity, to the vaginal area. Oral forms are very effective for long-term flora protection, sustainable microbiota support and safe use during times such as pregnancy.

## Criteria for Choosing a Vaginal Probiotic

When choosing a supplement, turning the box over and checking these criteria will keep you from wasting your money and your health:

- Make sure it contains the specific women's health strains we listed above (GR-1, RC-14, CTV-05, etc.).
- Check that the number of live bacteria (CFU) is at a clinically effective dose (usually between 1 billion and 5 billion CFU per serving).
- The balance of the vaginal microbiota depends directly on your hormonal status (oestrogen level), your diet and your stress level. Remember that probiotics are not a miracle; they protect the "vaginal environment" flawlessly only when combined with the right lifestyle and hygiene habits.

## References

- Gregor, R. et al. (2009). Clinical use of probiotics in the vaginal tract of women. International Dairy Journal, 19(6-7), 351-356. (This study is one of the key pieces of research proving vaginal colonisation by the GR-1 and RC-14 strains.)
- Brotman, R. M. et al. (2014). Association between vaginal microbiota and bacterial vaginosis. American Journal of Obstetrics and Gynecology, 210(2), 112-e1.
- Macklaim, J. M. et al. (2015). Changes in vaginal microbiota mitigating tissue inflammation and bacterial vaginosis: a review of Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14. Microbial Ecology in Health and Disease, 26(1), 27799.
- Vicariotto, F. et al. (2014). Effectiveness of the two microorganisms Lactobacillus fermentum LF15 and Lactobacillus plantarum LP01, formulated in slow-release vaginal tablets, in women affected by bacterial vaginosis. Journal of Clinical Gastroenterology, 48, S106-S112.
- Cohen, C. R. et al. (2020). Randomized trial of L. crispatus CTV-05 (LACTIN-V) for prevention of recurrent bacterial vaginosis. New England Journal of Medicine, 382(20), 1906-1915. (A recent and prestigious study showing the success of the L. crispatus strain in preventing recurrent infections.)

_This article is general information; it is not a diagnosis or treatment recommendation._