Understanding the Link Between Probiotics and Vaginal Health
Did you know your body is home to trillions of microorganisms, often referred to as your microbiome?
These tiny organisms play a massive role in your overall health. While the focus is often on the gut microbiome, the vaginal microbiome is equally important, especially when considering its role in women’s health.
Probiotics—specifically those designed to support vaginal health—are becoming a key part of the conversation, and for good reason.
What Is the Vaginal Microbiome?
The vaginal microbiome is a delicate balance of bacteria that helps protect against infections and keeps things running smoothly. In a healthy vaginal environment, about 90-95% of this bacteria comes from the Lactobacillus family. These helpful bacteria maintain a slightly acidic pH of 3.5 to 4.5, which provides a natural defense against harmful pathogens.
However, the balance can be easily disrupted by things like hormonal changes, medications, diet, or even everyday factors like stress or sexual activity. When this balance shifts, it can lead to issues like bacterial vaginosis (BV), yeast infections, or even fertility challenges.
Interestingly, research has also found that vaginal microbiomes can vary by ethnicity.
While Lactobacillus bacteria tend to dominate in caucasian and Asian women, Black and Hispanic women often have more diverse microbiomes. This diversity used to be considered an indication of an “unhealthy” microbiome, but newer studies suggest it may just be a natural variation. (1)
What Can Throw Off the Balance?
A lot of factors can influence your vaginal microbiome, including your genetics, immune system and environmental influences. Hormones, for instance, play a huge role. Estrogen helps Lactobacilli stick to the vaginal walls, so when estrogen levels drop—like during menopause—it can cause shifts in the microbiome, increasing the risk of infections and dysbiosis.
Other disruptors include:
- Antibiotics, which can kill off good bacteria
- Hormonal contraceptives
- Lifestyle choices like a high-sugar diet
- Sexual activity
- Personal hygiene choices like douching
- Stress and lack of sleep
Even fertility treatments like IVF can be impacted. Studies show that women with an imbalanced vaginal microbiome are 1.4 times less likely to have successful early pregnancy outcomes.(2)
How Probiotics Can Help
This is where probiotics come in. Specific strains of Lactobacillus, like L. rhamnosus GR-1 and L. reuteri RC-14, have been shown to support vaginal health by:
- Restoring balance to the vaginal microbiome
- Pushing out harmful bacteria
- Reducing inflammation
Probiotic bacteria can help restore the balance of the vaginal microbiome by adhering to the vaginal mucosa, displacing harmful pathogens, and reducing inflammation. They can also inhibit the growth of harmful bacteria and yeast and may even help prevent recurring infections like BV (bacterial vaginosis), commonly caused by the bacteria Gardnerella vaginalis, or vaginal yeast infections caused by Candida albicans. (3)
Research also suggests probiotics can be beneficial during pregnancy, reducing the risk of complications like gestational diabetes or pre-eclampsia (4). Some probiotic strains may even lower the likelihood of eczema in babies! (5)
The Role of Diet and Lifestyle
Your lifestyle and diet play a big role, too. A fiber-rich diet that supports gut health can also benefit your vaginal microbiome. Foods containing inulin, psyllium, resistant starches (green bananas, potatoes, legumes, and whole grains), and fermented options (think yogurt or kimchi) are great choices.
On the flip side, high amounts of sugar, alcohol, and caffeine can disrupt the microbiome, increasing the risk of infections and other health issues.
The diversity of the microbiome, particularly in the gut, plays a critical role in overall health. Gut dysbiosis has been linked to various conditions, including endometriosis, which is associated with systemic inflammation and immune imbalance. Maintaining a balanced gut microbiome can help regulate estrogen levels by minimizing estrogen reabsorption and promoting its safe elimination from the body.
Caring for Your Vaginal Microbiome
The vaginal microbiome is an essential part of your overall health, influencing everything from immunity to fertility. Probiotics formulated for vaginal health, combined with prebiotic foods, a balanced diet and mindful lifestyle choices, can help maintain that delicate balance.
As science continues to uncover how our microbiomes impact our well-being, one thing is clear: taking care of your microbiome is an investment in your health. Whether it’s through probiotics, dietary changes, or simply being aware of what affects your body, small steps can make a big difference.
Your body works hard to keep things balanced—why not give it a little extra support?
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Dr. Jennifer Potter, ND
Naturopathic Doctor San Jose
408-356-1364
References
(1)
Insights Into the Vaginal Microbiome in a Diverse Group of Women of African, Asian and European Ancestries.
Roachford OSE, Alleyne AT, Nelson KE.
PeerJ. 2022;10:e14449. doi:10.7717/peerj.14449.
(2)
Abnormal Vaginal Microbiota May Be Associated With Poor Reproductive Outcomes: A Prospective Study in IVF Patients.
Haahr T, Jensen JS, Thomsen L, et al.
Human Reproduction (Oxford, England). 2016;31(4):795-803. doi:10.1093/humrep/dew026.
The Vaginal Microbiome as a Predictor for Outcome of in Vitro Fertilization With or Without Intracytoplasmic Sperm Injection: A Prospective Study.
Koedooder R, Singer M, Schoenmakers S, et al.
Human Reproduction (Oxford, England). 2019;34(6):1042-1054. doi:10.1093/humrep/dez065
(3)
A Systems Biology Approach Investigating the Effect of Probiotics on the Vaginal Microbiome and Host Responses in a Double Blind, Placebo-Controlled Clinical Trial of Post-Menopausal Women.
Bisanz JE, Seney S, McMillan A, et al.
PloS One. 2014;9(8):e104511. doi:10.1371/journal.pone.0104511.
(4)
The Effects of Probiotics Supplementation on Metabolic Health in Pregnant Women: An Evidence Based Meta-Analysis.
Zheng J, Feng Q, Zheng S, Xiao X.
PloS One. 2018;13(5):e0197771. doi:10.1371/journal.pone.0197771.
Probiotic Supplements Improve Blood Glucose and Insulin Resistance/Sensitivity Among Healthy and GDM Pregnant Women: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
Pan YQ, Zheng QX, Jiang XM, et al.
Evidence-Based Complementary and Alternative Medicine : eCAM. 2021;2021:9830200. doi:10.1155/2021/9830200.
Effects of Probiotic Supplementation on Glucose Metabolism in Pregnant Women Without Diabetes: A Systematic Review and Meta-Analysis.
Zhang L, Hu X, Wang Y, et al.
Food & Function. 2022;13(16):8388-8398. doi:10.1039/d1fo04333a.
Nutraceuticals in Pregnancy: A Special Focus on Probiotics.
Perna A, Venditti N, Merolla F, et al.
International Journal of Molecular Sciences. 2024;25(17):9688. doi:10.3390/ijms25179688.
(5)
Maternal Probiotic Supplementation During Pregnancy and Breast-Feeding Reduces the Risk of Eczema in the Infant.
Rautava S, Kainonen E, Salminen S, Isolauri E.
The Journal of Allergy and Clinical Immunology. 2012;130(6):1355-60. doi:10.1016/j.jaci.2012.09.003.
Early Supplementation With Lactobacillus Rhamnosus HN001 Reduces Eczema Prevalence to 6 Years: Does It Also Reduce Atopic Sensitization?.
Wickens K, Stanley TV, Mitchell EA, et al.
Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology. 2013;43(9):1048-57. doi:10.1111/cea.12154.
