How the vaginal microbiome can effect fertility
If you’re trying to conceive, you’ve likely focused on hormones, ovulation, and egg quality. But there’s another key factor that’s often overlooked: the vaginal microbiome.
Emerging research shows that the balance of bacteria in the vagina can directly influence fertility, implantation, and even pregnancy outcomes.
In this article, we’ll explore how the vaginal microbiome affects fertility—and what you can do to support it naturally.
What Is the Vaginal Microbiome?
The vaginal microbiome is the collection of bacteria that live in the vaginal environment.
In optimal health, it is dominated by beneficial Lactobacillus species. These bacteria help:
Maintain a healthy vaginal pH level
Protect against harmful bacteria and infections
Support reproductive health and fertility
When this balance is disrupted (known as vaginal dysbiosis), it can create an environment that is less supportive of conception.
How the Vaginal Microbiome Affects Fertility
1. Impacts Sperm Health and Survival
A healthy vaginal environment supports sperm motility. When pH becomes more alkaline due to bacterial imbalance, sperm function may be reduced.
2. Influences Implantation
Research suggests the vaginal and uterine microbiome may affect whether an embryo successfully implants in the uterine lining.
3. Increases Inflammation
An overgrowth of harmful bacteria can trigger inflammation, which may interfere with early pregnancy processes.
4. Linked to Bacterial Vaginosis and Infertility
Conditions like bacterial vaginosis (BV) are associated with:
Reduced fertility
Increased risk of miscarriage
Higher likelihood of preterm birth
Signs of an Unhealthy Vaginal Microbiome
Some women experience clear symptoms, while others may have no obvious signs.
Common symptoms include:
Unusual vaginal discharge
Vaginal odour
Itching or irritation
Recurrent thrush or BV
Pain or discomfort during intercourse
Even without symptoms, microbiome imbalances can still impact fertility—making testing an important consideration.
How to Improve Vaginal Microbiome Health Naturally
Supporting your vaginal microbiome doesn’t require extreme measures. Small, targeted changes can make a significant difference. Here are a couple of tips on how to support your vaginal microbiome, there is a lot more we can do.
Eat for Microbiome Health
A fibre-rich, whole-food diet supports both gut and vaginal bacteria. Think vegetables, fruits, legumes, fermented foods (yoghurt, kefir, kimchi, sauerkraut) and polyphenol-rich foods like berries and olive oil.
Choose Microbiome-Friendly Products
Lubricants, condoms, and personal care products can affect vaginal pH. Wear bamboo or cotton underwear, these are more breathable materials allowing moisture to escape which prevents bacteria overgrowth.
Vaginal Microbiome Testing for Fertility
If you’ve been struggling to conceive or experiencing recurrent infections, vaginal microbiome testing may provide deeper insight.
Also known as vaginal microbiome mapping, this functional test can:
Identify specific bacterial imbalances
Detect hidden infections
Guide personalised treatment strategies
This goes beyond standard pathology testing, offering a more detailed view of your reproductive health, from there a targeted plan can be created for you.
When to Seek Support
If you’re experiencing:
Unexplained infertility or recurrent pregnancy loss
Recurrent BV or thrush
Failed implantation (including IVF)
Ongoing vaginal symptoms
…it may be time to investigate your vaginal microbiome as part of your fertility journey.
Book a Fertility Consultation
Optimising your vaginal microbiome is a powerful, often overlooked step in improving fertility.
As a clinical nutritionist, I take a personalised and evidence-based approach to reproductive health. During a 1:1 consultation, we can:
Explore your fertility history and health concerns
Assess whether vaginal microbiome mapping is right for you
Develop a targeted nutrition and lifestyle plan
If appropriate, functional testing—including vaginal microbiome analysis—can be recommended to give you clear, actionable answers.
Book your 1:1 consultation today to take the next step toward supporting your fertility naturally.