Vaginal Microbiome IVF Support: Same Result, Three Different Routes
By Rachael Robinson, Fertility Nutritionist. Updated November 2026.
Table of Contents
Key Takeaways
Low protective lactobacillus combined with higher levels of unwanted bacteria has been associated with implantation failure and lower live birth rates. Ideally, lactobacillus should be over 90% at the point of transfer.
Two people can have almost identical test results and still need completely different protocols, depending on which disruptive bacteria are present and their wider health.
Testing early, before transfer or before trying to conceive, gives you time to act rather than looking for answers after a loss.
Introduction
When it comes to vaginal microbiome IVF preparation, many people now understand that the vaginal microbiome matters. What's far less widely understood is that two test reports can look almost the same, and yet the route to fixing them can be very different.
In my nutrition clinic, much of my work involves supporting clients to optimise their vaginal microbiome ahead of an IVF transfer or natural conception. Over the last three weeks, three clients came to me with strikingly similar results. Each of them needed a different protocol. All three now have lactobacillus levels over 90%.
Here's what that looked like, and why it matters for you.
Why Vaginal Microbiome IVF Testing Should Happen Early
I encourage everyone I work with to test as early as possible. Unfortunately, the vaginal microbiome often isn't looked into until someone has had a miscarriage or an implantation failure of a euploid embryo.
That's a real shame. A euploid embryo is chromosomally normal, so when it doesn't implant, people understandably want to know why. The vaginal microbiome is one piece of that puzzle, and it's a piece we can often do a great deal about. Testing early means that if something needs addressing, there's time to address it properly. Testing after a loss still gives you answers, but often later than you needed them.
The Problem With "Spray and Pray"
One option is to take a general probiotic and hope it boosts lactobacillus. It's a popular approach, and on the surface it makes sense. However, the real question is whether there are disruptive bacteria sitting in that vaginal microbiome. We know that low levels of protective bacteria, combined with higher levels of unwanted bacteria, have been associated with implantation failure and lower live birth rates.
In other words, adding good bacteria doesn't always deal with the bad. If unwanted bacteria are present, and especially if they're protected by a biofilm, a standard probiotic may not be enough to shift the balance.
Three Clients, Three Similar Results
Within the space of three weeks, three different clients ran vaginal microbiome tests. Two of them had just 1% protective lactobacillus. The third had 8%.
To put that into context, we want lactobacillus to be over 90% at the point of transfer. All three were a long way from that target.
On paper, they looked alike. In reality, each person's situation was quite different:
Client one has IBD, so we had to be particularly careful about which probiotic strains were suitable.
Client two had ureaplasma alongside low lactobacillus.
Client three had BV-associated bacteria.
As a result, the protocol for each needed to be quite different.
How the Protocols Differed
A gentle approach
For one client, the right approach was oral probiotics at a low dose. Her wider health picture shaped that decision, and choosing the right strains carefully was just as important as the dose.
Biofilm disruption
The other two clients needed a biofilm disruptor protocol. Biofilms are protective layers that bacteria can build around themselves, which makes them harder to clear.
Even between these two clients, the protocols looked different. Depending on the person, a biofilm disruptor protocol can include supplements such as:
NAC, taken on an empty stomach
Serrapeptase
Nattokinase, taken on an empty stomach twice daily
Following this, both clients were prescribed antibiotics by their gynaecologist. Working alongside medical professionals is an important part of getting these results.
Repopulating with lactobacillus
Once the unwanted bacteria had been addressed, we repopulated with lactobacillus, both orally and vaginally. Interestingly, these clients took different doses and different strains.
Strain choice really does matter. For example, another client I've worked with had Streptococcus agalactiae. She may need different strains to someone with ureaplasma. That's why "take a probiotic" is a starting point rather than a protocol.
The Everyday Basics
Alongside any supplement protocol, I encourage everyone I work with to make a few simple changes:
Wear cotton underwear
Avoid thongs
Avoid fragranced soaps when washing
These small habits support a healthier vaginal environment. They also help protect the progress made through a targeted protocol.
The Results
The great news is that we've now retested all three clients. In every case, the unwanted bacteria have gone and lactobacillus is now over 90%.
Three different starting points. Three different protocols. One shared result.
Conclusion
Many people now know how important vaginal microbiome support is for fertility. Even so, this is a clear example of how tailored support can lead to what looks like the same result on a test report, while the route there is very different for each person.
Your test results, your health history and the specific bacteria present all shape what your protocol should look like. A one-size-fits-all approach may miss what's really going on. A personalised approach gives you the best chance of reaching that 90% target before transfer or conception.
Next Steps
If you're preparing for IVF, planning a frozen embryo transfer, or trying to conceive naturally, don't wait for a setback before looking at your vaginal microbiome. Book a consultation so we can review your test results and build a personalised plan. You can reach out via the contact form or explore my nutrition resources to receive tailored, evidence based support through every stage of pregnancy. You can also join my newsletter for evidence based guidance and gentle emotional support.
Arrange a 1:1 session via the contact form and we can work on a plan that supports you, whatever your situation and whatever you have been through.
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