SCIENTIFIC INSIGHTS
The connection between intimates discomfort and vaginal pH.
Itching, burning, foul-smelling discharge... Throughout their lives, almost all women experience, to varying degrees, vaginal discomforts like these, which might be the sign of inflammation: vaginitis. When vaginal inflammation has an infectious origin, it is referred to as vaginosis.
Vaginitis and vaginosis are originally linked to a variation in vaginal pH. Under normal conditions, the pH is particularly acidic (4-4.5), which inherently reduces the risk of developing infections.
However, there are factors that can cause fluctuations in pH, triggering mechanisms that ultimately lead to the onset of the most common vaginal discomforts.
Causes and consequences of vaginal pH fluctuations
Among the main triggering factors, we can mention:
- physiological hormonal variations related to the menstrual cycle, pregnancy, or menopause,
- the use of irritating products, from “aggressive” intimate cleansers to detergents used for washing clothes,
- a diet excessively rich in sugars, cheeses, baked goods, and fermented beverages, such as beer and alcoholic drinks in general,
- alterations of the gut and urinary tract microbiota,
- prolonged conditions of stress or fatigue that can weaken the vaginal immune defences,
- wearing tight clothing or synthetic underwear.
When these factors lead to significant changes in vaginal pH, pathogenic agents are given the green light. In simple terms, they colonise the vaginal bacterial flora thus causing more or less significant imbalances that manifest through specific symptoms. The most common include:
- white-grayish vaginal discharge (leukorrhea), rather watery and foul-smelling,
- itching of varying intensity,
- burning during urination,
- pain during sexual intercourse.
Pathogens responsible for vaginal infections
The pathogens that most often cause vaginal infections include:
- bacteria, such as Gardnerella vaginalis and Escherichia coli,
- fungi, such as Candida,
- protozoa, such as Trichomonas vaginalis.
There are also many cases where a specific cause cannot be identified. In a review of studies published between 1966 and 20031, it was found that for about 30% of symptomatic cases, a precise diagnosis could not be made.
Sometimes they come back!
Another interesting fact concerns recurrent conditions, such as vaginitis or vaginosis, which tend to repeat with some frequency. It has been estimated that in Italy, 75% of women have experienced at least one episode of vulvovaginal candidiasis in their lifetime, and 40-45% have had two or more episodes.1
How to fight against vaginosis and vaginitis
Therapeutic strategies often involve the use of antibiotics, both orally and vaginally (in the form of suppositories, creams, or gels). They are generally effective during the acute stage, but their intake has to be evaluated with a doctor especially in case of recurrence, as there is a risk of developing antibiotic resistance through repeated antibiotic treatments.
The real key to prevention.
- Maintain proper intimate hygiene. Consult your gynecologist or pharmacist about the most suitable products and methods for keeping the vaginal area clean. You might be advised not to use internal vaginal douches, change hygienic towels frequently during menstruation, and limit the use of tampons and liners.
- Wear breathable cotton underwear and, in general, choose clothing that is not too tight.
- Pay attention to your diet. One key piece of advice: avoid excessive consumption of foods high in refined sugars and yeasts.
- Protect yourself during "risky" sexual intercourse by using barrier methods, such as condoms.
- Use specific probiotics to support your vaginal bacterial flora, which helps prevent the growth of pathogens, while also supporting the gut microbiome.
Speaking of probiotics, let’s have a look at some studies conducted on the probiotics we have selected for the formulation of ProbioGea Donna.
Scientific Studies
A patented mix of probiotics: Lactiplantibacillus plantarum PBS067, Lacticaseibacillus rhamnosus LRH020, Bifidobacterium animalis subsp. lactis BL050
Presti I, D’Orazio G, Labra M, et al. Evaluation of the probiotic properties of new Lactobacillus and Bifidobacterium strains and their in vitro effect. Appl Microbiol Biotechnol. 2015 Jul;99(13):5613-26. doi: 10.1007/s00253-015-6482-8. Epub 2015 Mar 7. PMID: 25744647.
Various in vitro tests have recognized this patented mix as effective in countering the settlement and proliferation of pathogenic germs, such as Escherichia coli, and in providing a steric competition (essentially, pathogens do not have enough space to adhere and proliferate). Additionally, a co-aggregation mechanism with urogenital pathogens has been observed, meaning that probiotics tend to cluster pathogenic urogenital bacteria together, thereby inhibiting their functionality. This effect has been demonstrated against Candida albicans, Escherichia coli, Gardnerella vaginalis, Candida glabrata, Trichomonas vaginalis, and Neisseria gonorrhoeae (see Evaluation of Antimicrobial, Antiadhesive and Co-Aggregation Activity of a Multi-Strain Probiotic Composition against Different Urogenital Pathogens doi: 10.3390/ijms24021323).
All these actions allow the probiotic complex to slow down tissue inflammatory states, help activate the immune response by increasing the release of IL-4 cytokines (IL-4 stimulates immune defences) and provide a significantly greater synergistic antioxidant potential compared to individual strains (meaning it exerts an antioxidant effect, and consequently, an anti-inflammatory effect as well). Additionally, the probiotic complex protects the cellular vitality of the epithelium after induced stress (research has shown that the epithelial tissue lining the vaginal environment exhibits increased vitality once the "good" bacterial film from the patented formulation is established).
Mezzasalma V, Manfrini E, Ferri E, et al. Orally administered multispecies probiotic formulations to prevent uro-genital infections: a randomized placebo-controlled pilot study. Arch Gynecol Obstet. 2017 Jan;295(1):163-172. doi: 10.1007/s00404-016-4235-2. Epub 2016 Nov 9. Erratum in: Arch Gynecol Obstet. 2017 Feb;295(2):527. PMID: 27826653.
This clinical study investigated the efficacy of the patented multi-strain probiotic formulation used, administered orally, to prevent urogenital infections. The study involved 40 healthy women, divided into a test group and a placebo group. The treatment group took the probiotic mix for 14 days, while the other group received an inert product. The specific probiotic mix demonstrated its ability to reach and colonise the vagina through oral intake, with a significant increase in the vaginal concentrations of the various strains in the test group compared to the placebo. Additionally, the vaginal pH levels showed a significant reduction, even during the period when product administration was suspended. This indicates that these patented probiotics, when taken orally, can beneficially colonise the vagina, resulting in a significant and lasting colonization effect.
Murina, Filippo & Vicariotto, Franco. (2019). Evaluation of an Orally Administered Multistrain Probiotic Supplement in Reducing Recurrences Rate of Bacterial Vaginosis: A Clinical and Microbiological Study. Advances in Infectious Diseases. 09. 151-161. 10.4236/aid.2019.93011.
This important clinical study recruited 75 women (aged 18-50) suffering from recurrent bacterial vaginosis. After treatment with the antibiotic metronidazole, the test group received the patented probiotic mix, while the placebo group was given an inert product. The mix of L. plantarum PBS067, L. rhamnosus LRH020, and B. animalis subsp. lactis BL050 provided significant relief from symptoms after the acute treatment and was able to reduce symptom worsening over time, whereas the placebo group experienced symptom aggravation. Moreover, in the group that took the probiotics, the success rate of the antibiotic therapy improved by 24%, and the recurrence rate dropped by 40%. Finally, this mix demonstrated a clear superiority in restoring the vaginal microbiota compared to the placebo group.
Vicariotto F, Malfa P, Viciani E, et al. Efficacy of Lactiplantibacillus plantarum PBS067, Bifidobacterium animalis subsp. lactis BL050, and Lacticaseibacillus rhamnosus LRH020 in the Amelioration of Vaginal Microbiota in Post-Menopausal Women: A Prospective Observational Clinical Trial. Nutrients. 2024 Jan 30;16(3):402. doi: 10.3390/nu16030402. PMID: 38337685; PMCID: PMC10857347.
Due to hormonal deficiencies, vulvovaginal issues (such as intimate dryness, inflammatory states, and an increased tendency for vaginal infections) can intensify during menopause. In this clinical study, 50 healthy postmenopausal women aged between 45 and 65 were given a patented mix of lactobacilli and bifidobacteria for 28 days. The probiotic complex demonstrated up to a 50% improvement in vaginal health for menopausal women (assessed through vaginal elasticity, secretion, mucosal state, integrity, and lubrication) and helped restore a healthy vaginal pH by re-establishing lactobacilli, which inhibit the growth of pathogens. Additionally, there was a significant reduction in inflammatory markers, with results observed within one month that persisted over time. Finally, the analysis of the vaginal microbiota showed that the patented mix promotes an increase in "good" bacteria typical of vaginal flora and reduces the presence of recurring vaginal pathogens such as Streptococcus, Gardnerella, Atopobium, Escherichia, and Shigella.
Lactobacillus crispatus
De Seta F, Campisciano G, Zanotta N, Ricci G, Comar M. The Vaginal Community State Types Microbiome-Immune Network as Key Factor for Bacterial Vaginosis and Aerobic Vaginitis. Front Microbiol. 2019 Oct 30;10:2451. doi: 10.3389/fmicb.2019.02451. PMID: 31736898; PMCID: PMC6831638.
The classification of the vaginal microbiota can be based on the relative abundance of various species of specific lactobacilli, identifying five different microbial communities known as “Community State Types” or CSTs. In this study, women with a CST I microbiota, characterized by the prevalence of Lactobacillus crispatus and a pH of 4, showed the lowest risk of vaginosis or contracting milder infections. While a completely rigorous ranking cannot be established, L. crispatus appears to be the most protective among lactobacilli for the well-being of the vaginal environment.
Mändar R, Sõerunurk G, Štšepetova J, et al. Impact of Lactobacillus crispatus-containing oral and vaginal probiotics on vaginal health: a randomised double-blind placebo controlled clinical trial. Benef Microbes. 2023 Apr 18;14(2):143-152. doi: 10.3920/BM2022.0091. Epub 2023 Mar 1. PMID: 36856121.
This interesting placebo-controlled clinical study tested the use of Lactobacillus crispatus, administered both orally and vaginally, in women with bacterial vaginosis (BV) and vulvovaginal candidiasis (VVC) aged between 18 and 50. The study showed that both oral and vaginal capsules reduced signs and symptoms in patients with BV, with notable improvements in discharge as well as itching/irritation. In patients with VVC, the oral capsules were able to lower the combined score of the two most important symptoms: the amount of discharge and itching/irritation. Notably, the oral treatment with L. crispatus performed comparably for bacterial vaginosis and even better for candidiasis compared to vaginal administration, thus representing an equally effective but more practical and convenient therapeutic method.
Lactobacillus fermentum
Kaur, Baljinder & Balgir, Praveen & Bhartimittu, Dr & Chauhan, Ashish & Kumar, Balvir. (2013). Purification and Physicochemical Characterization of Anti-Gardnerella vaginalis Bacteriocin HV6b Produced by Lactobacillus fermentum Isolate from Human Vaginal Ecosystem. American Journal of Biochemistry and Molecular Biology. 3. 91-100. 10.3923/ajbmb.2013.91.100.
This interesting in vitro study highlighted how Lactobacillus fermentum can metabolise proteins known as bacteriocins, which have a bactericidal effect against Gardnerella vaginalis, the primary bacterium responsible for vaginosis. The study demonstrated that this protein produced by L. fermentum strongly inhibits the growth of G. vaginalis, thereby serving as an important probiotic for women's intimate health.
Reid G, Charbonneau D, Erb J, Kochanowski B, et al. Oral use of Lactobacillus rhamnosus GR-1 and L. fermentum RC-14 significantly alters vaginal flora: randomized, placebo-controlled trial in 64 healthy women. FEMS Immunol Med Microbiol. 2003 Mar 20;35(2):131-4. doi: 10.1016/S0928-8244(02)00465-0. PMID: 12628548.
This placebo-controlled clinical study, conducted on 64 women, investigated the synergistic action between Lactobacillus fermentum and Lactobacillus rhamnosus (also present in the patented probiotic complex) on the vaginal microbiota. Microscopic analysis of vaginal swabs showed that oral administration of L. rhamnosus and L. fermentum achieved significant results in restoring a normal microflora populated by lactobacilli and in reducing coliform bacteria (pathogenic bacteria) and yeasts.
Kang CH, Kim Y, Han SH, Kim JS, Paek NS, So JS. In vitro probiotic properties of vaginal Lactobacillus fermentum MG901 and Lactobacillus plantarum MG989 against Candida albicans. Eur J Obstet Gynecol Reprod Biol. 2018 Sep;228:232-237. doi: 10.1016/j.ejogrb.2018.07.005. Epub 2018 Jul 9. PMID: 30014929.
In another study, the in vitro synergy between Lactobacillus fermentum and Lactobacillus plantarum (a strain present in the probiotic mix) was tested against Candida albicans. The tests revealed that the cells of C. albicans lost their metabolic activity and were ultimately eliminated.
Lactoferrin
Russo R, Karadja E, De Seta F. Evidence-based mixture containing Lactobacillus strains and lactoferrin to prevent recurrent bacterial vaginosis: a double blind, placebo controlled, randomised clinical trial. Benef Microbes. 2019 Feb 8;10(1):19-26. doi: 10.3920/BM2018.0075. Epub 2018 Dec 10. PMID: 30525953.
The aim of this clinical study was to evaluate the efficacy of a probiotic mix, including Lactobacillus acidophilus and Lactobacillus rhamnosus, combined with bovine lactoferrin, as an adjunct therapy to the antibiotic metronidazole in women with recurrent bacterial vaginosis. Forty-eight volunteers with recurrent bacterial vaginosis were divided into a test group and a placebo group. Initially, they received metronidazole as acute treatment, followed by the test product or placebo for 10 days each month for 6 months, starting on the first day of menstruation. The results showed that symptoms (vaginal discharge and itching) and the recurrence rate were significantly reduced by the probiotic mix in combination with lactoferrin. In conclusion, this approach may represent a safe and effective remedy for restoring a healthy vaginal microbiota and preventing recurrences of bacterial vaginosis.
Russo R, Superti F, Karadja E, De Seta F. Randomised clinical trial in women with Recurrent Vulvovaginal Candidiasis: Efficacy of probiotics and lactoferrin as maintenance treatment. Mycoses. 2019 Apr;62(4):328-335. doi: 10.1111/myc.12883. Epub 2019 Feb 20. PMID: 30565745.
Vulvovaginal candidiasis (VVC) is a recurring condition in pregnant women. This study evaluated the efficacy of an oral formulation containing Lactobacillus acidophilus, Lactobacillus rhamnosus, and bovine lactoferrin on the symptoms and recurrence of VVC as an adjunct therapy to topical clotrimazole. Forty-eight pregnant women positive for C. albicans, with symptoms of VVC and a documented history of recurrences, were randomly divided into two groups that received either the probiotic complex or a placebo as adjunct treatment for clotrimazole, following a maintenance cycle of 6 months (1 capsule/day or placebo for 10 consecutive days each month). Symptoms, overall healing rate, and recurrence rate were assessed. After therapy with clotrimazole, a significant improvement in symptoms was observed in both groups. However, only the women treated with probiotics and lactoferrin showed significant improvement in itching and discharge at 3 and 6 months. During the six-month follow-up, recurrences were significantly lower in the intervention group compared to the placebo: 33.3% vs. 91.7% after 3 months and 29.2% vs. 100% after 6 months, indicating a threefold improvement. The results demonstrate that the mixture of lactobacilli in combination with lactoferrin represents a safe and effective adjunct approach to reduce symptoms and recurrences of vulvovaginal candidiasis, even in pregnant women.
Inulin from chicory
Qin YQ, Wang LY, Yang XY, et al. Inulin: properties and health benefits. Food Funct. 2023 Apr 3;14(7):2948-2968. doi: 10.1039/d2fo01096h. PMID: 36876591.
This review of studies focuses on the function of inulin and its health benefits, including its recognized prebiotic activity, which stimulates the growth of beneficial bacteria and contributes to the balance of the gut microbiota. This action indirectly impacts on intimate well-being, as the development of these "good" bacteria in the intestines also promotes subsequent beneficial vaginal colonization.
Hughes RL, Alvarado DA, Swanson KS, Holscher HD. The Prebiotic Potential of Inulin-Type Fructans: A Systematic Review. Adv Nutr. 2022 Mar;13(2):492-529. doi: 10.1093/advances/nmab119. Epub 2023 Feb 10. PMID: 34555168; PMCID: PMC8970830.
This review of studies confirms the beneficial prebiotic function of inulin on the gut microbiota (increased levels of bifidobacteria and lactobacilli) and on the gut barrier. It's important to remember that intestinal health and vaginal health are always closely interconnected.
DISCLAIMER
Our texts are for informational purposes only and should not be considered as indications for diagnosis and treatment of pathological conditions. They cannot replace your physician’s advice.
I nostri testi hanno scopo divulgativo, non vanno intesi come indicazione di diagnosi e cura di stati patologici e non vogliono sostituirsi in alcun modo al parere del Medico.