Estrobolome Health—the bacteria in the gut capable of metabolizing and circulating estrogen.

What Is the Estrobolome? The Gut’s Role in Estrogen Balance

If you aren’t super familiar with health and wellness jargon, then the term “estrobolome” might sound a little like a science fiction character. Not to worry — we’re here to break down this gut health term and clear up why it’s important for women during midlife and beyond. 

Let’s start with a definition: Estrobolome refers to a group of gut bacteria that help metabolize estrogen. 

These bacteria produce enzymes, like one called β-glucuronidase, that influence how estrogen is processed. They can essentially help “recycle” some estrogen back into the body rather than allowing it to be fully excreted. Because of this, the estrobolome helps regulate the body’s overall estrogen levels.

This process becomes especially relevant during perimenopause when estrogen levels fluctuate, and after menopause when they stay low. Even small shifts in how the body processes and recycles estrogen can affect hormone balance. And on the flip side,  hormonal changes that happen during menopause can change the composition of the gut microbiome, which may, in turn, affect how efficiently the estrobolome functions. Ahead, we’ll take a closer look at the dynamic between gut health and hormones to better understand how it may shape menopause symptoms and long-term health, and what you can do to support both. 

How Gut Bacteria Influence Menopause Symptoms

Gut health, hormones, and mood are very interconnected, so changes in one can then affect the others. During menopause in particular, shifts in the gut microbiome may play a role in how some symptoms develop or feel from day to day.

More specifically, as estrogen levels decline, the balance of bacteria in the gut can change, which could influence common symptoms like hot flashes and weight and metabolic changes. Because the estrobolome helps regulate how your body processes estrogen, changes in gut bacteria can also affect how much estrogen you have. 

Here are four ways the gut health and menopause symptoms overlap: 

1. Mood shifts. You may have heard of the gut-brain axis before. This refers to the relationship between gut bacteria and compounds that affect the brain. Interestingly, a large portion of the body’s serotonin (a chemical involved in mood regulation) is made in the gut. So when the microbiome is out of balance, mood, sleep, and cognitive function can also be impacted. Bringing it back to midlife, each of those systems can already feel more vulnerable during the menopausal transition.

2. Inflammation. Intestinal permeability, or colloquially “leaky gut,” happens when the gut lining becomes less effective at keeping certain substances out of the bloodstream. Studies suggest there’s a connection between leaky gut and inflammation, and increased inflammation is also linked to declining estrogen and menopausal weight gain.

3. Body composition changes. Many women notice more abdominal fat during midlife, along with changes in how the body handles blood sugar. Some research suggests the gut microbiome may influence insulin sensitivity and fat storage, which can further contribute to these changes. 

4. Temperature regulation. It’s no secret that hot flashes are a very common symptom during menopause, mostly thanks to declining estrogen levels. But it turns out that some gut bacteria also play a role in maintaining body temperature and homeostasis. 

All things considered, the gut microbiome, including the estrobolome, is part of a larger network that connects digestion, hormones, metabolism, and brain health. So taking steps to support gut health may help manage and mitigate certain menopause symptoms. 

Diet, Fiber, and Lifestyle: Supporting a Healthy Estrobolome

There are plenty of everyday habits that support gut health and may also help support estrogen production. Things like diet, movement, sleep, and other lifestyle factors all influence hormones and shape the gut microbiome, which might in turn influence how estrogen is processed. 

Let’s start with eating habits since that’s one of the biggest players — a diet rich in whole plant foods is one of the most effective ways to support gut bacteria. Fill your plate with these foods: 

• Vegetables. Fiber-rich veggies like Brussel sprouts, broccoli, and squash are great for their high-fiber content. Garlic, onions, and asparagus are also helpful for the gut, as they’re considered prebiotics (which fuel probiotics). 

• Fruits. Opt for low-sugar and high-fiber, antioxidant-rich fruits like raspberries, blueberries, and apples. 

• Legumes. This group includes things like chickpeas, beans, and soy products. Soy foods in particular, like edamame, tofu, and tempeh, have plant compounds that support the estrobolome, interact with estrogen receptors and support overall hormonal health. 

• Whole grains. Think oats, brown rice, quinoa, farro, and barley. These complex carbs are a great source of fiber and healthier alternatives to simple carbs like pasta and bread. 

• Nuts and seeds. Nuts and seeds are rich in fiber, protein, and healthy fats. 

• Fermented foods. Things like yogurt, kefir, sauerkraut, and kimchi are fermented, which means they contain probiotics (i.e., helpful microbes that support good gut diversity). 

These foods all support gut health in different ways, with many being both anti-inflammatory and heart healthy. But the main takeaway is that they act as fuel for beneficial gut microbes that can then produce compounds to support the gut lining, helping to maintain microbiome and hormonal balance. 

Now, as for what to avoid. It’s best to limit ultra-processed foods, excess alcohol, and large amounts of red or processed meats, which are associated with less diverse gut bacteria and higher levels of inflammation. 

So, what about other lifestyle habits? Focus on these three things: 

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• Stay well hydrated to support digestion and regular bowel function

• Engage in physical activity to maintain overall metabolic health and greater gut microbial diversity 

• Get consistent sleep to support the microbiome and your body’s circadian system.

• If this sounds like a lot of changes at once, remember to take it slowly. The goal is to make small changes over time and stay consistent, not perfect.

Probiotics, Prebiotics, and the Estrobolome: What’s the Evidence?

In theory, certain gut microbes may help regulate how much estrogen is reactivated in the gut through enzymes such as beta-glucuronidase, which can send some estrogen back into circulation instead of allowing it to be fully excreted. This concept has led researchers to look into whether changing the microbiome through supplements or diet could affect estrogen balance and, in turn, menopause symptoms.

So far, the most accurate takeaway is that probiotics and prebiotics look promising, but they’re not a proven menopause treatment. Here’s how they differ:  

• Probiotics. Scientific reviews suggest that some probiotic strains, often from the Lactobacillus and Bifidobacterium groups, may support vaginal, metabolic, or inflammatory health in postmenopausal women.

• Prebiotics. Prebiotics may also help by feeding beneficial bacteria already living in the gut. This matters because a more diverse, well-supported microbiome may be better able to maintain normal gut barrier function and microbial balance. Still, researchers don’t yet know exactly which supplements, combinations, or treatment plans work best for estrogen metabolism specifically.

The bottom line is that probiotic and prebiotic supplements might be a helpful add-on for some women, especially as part of a broader gut-friendly routine, but they aren’t usually a stand-alone fix for menopause symptoms.

As always, it’s best to check with a healthcare provider before adding any new supplements to your routine, especially if you have any medical conditions or immune system concerns. 

Gut Health, Hormone Therapy, and Menopause Treatments

Menopause hormone therapy (MHT) is a safe and effective treatment option for many women, especially when it’s prescribed based on age, symptoms, health history, and timing. 

Because the estrobolome helps regulate how estrogen is processed in the body, it makes sense to consider whether gut health might influence how hormone therapy works. You may be wondering whether changes in the gut microbiome could interfere with MHT, or if probiotics and other gut health measures could better support MHT. 

So far, there’s no strong evidence that changes in the gut make MHT less effective, but things like probiotics and a gut-healthy diet can be a supportive add-on to MHT for a more big-picture approach. 

This is a great example of why personalized care matters. Some women benefit from systemic MHT for symptoms like hot flashes and night sweats, while others may need local treatment for vaginal or vulvar symptoms. Either way, gut health can be part of that broader conversation. 

In many cases, the best plan is one that addresses both hormone-related symptoms and the broader factors that shape midlife health.

Gut Health and Long-Term Menopause Risks: Bone, Brain, and Heart

Menopause comes with day-to-day symptoms, but lower estrogen levels can also have longer-term impacts on bone strength, heart health, and cognitive function.

More research is needed to understand exactly how the estrobolome fits in. But gut health does seem to be one part of the picture since a less diverse gut microbiome can lead to more inflammation, changes in metabolism, and lower estrogen levels in the body. 

These shifts can impact the following body systems over time:

• Bone health. Lower estrogen levels can result in bone density loss, while a healthy gut microbiome is involved with how your body absorbs nutrients (which also helps maintain bone density). 

• Heart health. Changes in cholesterol, how the body stores fat and regulates blood sugar, and inflammation after menopause can all increase heart health risk. The gut microbiome can also contribute to each of these factors. 

• Brain health. The gut and brain are closely connected. Inflammation and metabolic changes may contribute to cognitive decline over time, especially as estrogen levels go down. 

Though a healthy gut microbiome is just one piece of the puzzle, it’s a meaningful one. Supporting it through diet, lifestyle, and medical care (when appropriate) can all be part of a healthy aging plan. 

“As estrogen levels shift during perimenopause and menopause, the gut microbiome becomes an increasingly important regulator of hormonal balance.  Supporting gut health isn’t just about digestion - it's a foundational strategy for optimizing estrogen metabolism, reducing inflammation, and promoting long-term metabolic and overall health during this transition and beyond.” - Dr. Amy Hayes

When to Get Help: Recognizing Symptoms and Getting Personalized Care

Menopause can bring a plethora of changes, and not all of them are super obvious. We’re looking at you, digestive changes, shifts in mood, bloating, sleep issues, or weight gain. 

The good news is that there are treatments and strategies out there for most of those symptoms. If you’re experiencing any of them consistently, it may be time to look into medical support. 

Plus, if you’re even considering it, just know that talking to a healthcare provider can’t hurt (and it’s often the first step toward feeling better). 

Depending on your situation, a provider might talk to you about menopause hormone therapy, certain lifestyle adjustments, or other strategies to support your gut microbiome, like adding probiotic supplements. The goal is to get your symptoms under control while also thinking of ways to support your long-term health during menopause and beyond.

If you’re ready to get support, you can connect with a menopause-trained clinician through Alloy who will review symptoms, discuss treatment options, and help create an individualized care plan.

Frequently Asked Questions

What is the estrobolome and why does it matter?

The estrobolome is a specific group of bacteria in your gut microbiome that is responsible for metabolizing and regulating estrogen. These bacteria produce an enzyme called β-glucuronidase, which determines whether estrogen is excreted as waste or "recycled" back into your bloodstream. During menopause, when estrogen levels are already declining, an efficient estrobolome helps maintain hormonal balance and can influence the severity of symptoms like hot flashes and mood shifts.

How does gut health affect menopause symptoms?

Because the gut and hormones are deeply interconnected, an imbalanced microbiome can worsen menopause symptoms. A healthy gut supports the production of serotonin for mood regulation, maintains the intestinal lining to prevent inflammation, and influences how the body stores fat and manages blood sugar. By supporting the estrobolome through a fiber-rich diet and healthy lifestyle, you can help mitigate common midlife issues like abdominal weight gain, sleep disturbances, and temperature regulation.

Can probiotics and prebiotics help with estrogen levels?

While not a standalone cure for menopause, probiotics and prebiotics can be a supportive add-on to your routine. Certain probiotic strains, like Lactobacillus and Bifidobacterium, may support metabolic and inflammatory health in postmenopausal women, while prebiotics serve as fuel for beneficial bacteria. A more diverse microbiome may better maintain gut barrier function and help the estrobolome process estrogen more efficiently, though these supplements are most effective when paired with a gut-friendly diet and, if necessary, menopause hormone therapy (MHT).