September 7, 2026
Is Your Estrogen Helping You — or Harming You?
Estrogen is often talked about as though it is either good or bad.
Estrogen is often talked about as though it is either good or bad.
Estrogen is often talked about as though it is either good or bad.
Too little estrogen? We worry about hot flushes, vaginal dryness, bone loss, sleep and cognitive changes.
Too much estrogen? We hear about PMS, heavy periods, breast tenderness, fibroids and weight gain.
But the real story is much more nuanced.
It isn't simply about how much estrogen you have. It is also about what your body does with that estrogen once it has been used.
Your liver has to metabolise it. Your gut has to help eliminate it. Your microbiome can influence whether some estrogen compounds leave the body or are recirculated.
And this is why, in Functional Medicine, I rarely look at female hormones without also thinking about the gut.
“Estrogen dominance” is a term commonly used in integrative and Functional Medicine to describe a situation where estrogenic activity is high relative to progesterone, or where estrogen metabolism and clearance may be contributing to symptoms.
Importantly, this does not necessarily mean your estrogen blood level is abnormally high.
You can have a relatively normal estradiol result and still have a hormone picture in which estrogen is exerting a stronger effect relative to progesterone — something we commonly think about during perimenopause, when ovulation can become less consistent and progesterone may fall.
Symptoms that can occur alongside this type of hormonal imbalance include:
Conditions such as fibroids and endometriosis are also estrogen-responsive, although they are complex conditions and cannot simply be attributed to “too much estrogen”.
This is the part many women have never been told.
Your gut doesn't just digest food. It participates in hormone metabolism.
After estrogen has done its job, it is metabolised primarily by the liver. Some estrogen metabolites are conjugated — essentially chemically packaged — to help the body eliminate them.
They can then be excreted through bile into the intestine and ultimately leave the body in the stool.
At least, that is the plan.
Because once those compounds reach the gut, your microbiome gets involved.
The estrobolome refers to the collection of gut microbial genes capable of influencing estrogen metabolism.
One of the enzymes involved is beta-glucuronidase.
Certain gut bacteria produce beta-glucuronidase, which can deconjugate estrogen compounds in the intestine. In simple terms, it can remove some of the biochemical “packaging” that was helping prepare estrogen for elimination.
That may allow some estrogen to become available for reabsorption through the gut and return to the circulation.
Think of it like this:
Liver → processes estrogen → intestine → elimination
But under some circumstances:
Liver → processes estrogen → intestine → deconjugation → reabsorption
Instead of simply leaving through the back door, some estrogen gets another ticket around the system.
This is one reason the relationship between gut health, the microbiome and female hormones is receiving so much attention.
Potentially, yes — but it is more complex than blaming one bacterium or one enzyme.
The composition of the microbiome, intestinal transit, constipation, diet, inflammation, liver function, body composition, alcohol intake, medications and hormone production itself can all influence the overall hormonal picture.
This is why I become particularly interested when I see hormonal symptoms occurring alongside digestive problems such as:
bloating, constipation, IBS-type symptoms, altered bowel habits or significant dysbiosis.
Clinically, I often see the two pictures overlapping.
The more disrupted the gut appears to be, the more complicated the hormonal picture can become.
That doesn't mean the gut is always causing the hormone problem. But it does mean it may be an important part of the puzzle.
We can talk endlessly about “detoxing estrogen”, but there is a very practical endpoint to all of this:
you have to eliminate it.
If compounds have been processed by the liver and delivered into the digestive tract for excretion, regular bowel movements become part of that clearance pathway.
This is one reason constipation shouldn't be ignored in someone struggling with hormonal symptoms.
Rather than jumping immediately to supplements designed to “balance estrogen”, I want to know:
Are you opening your bowels regularly?
Are you eating enough fibre?
Are you feeding a diverse microbiome?
Is there significant dysbiosis?
Is the liver adequately supported nutritionally?
Are we producing too much estrogen, clearing it poorly, or dealing with relatively low progesterone?
Those are very different problems requiring very different approaches.
This is perhaps the most important point.
We don't want to get rid of estrogen.
Estrogen is enormously important for female health. It plays roles in bone, brain, cardiovascular, urogenital and metabolic health, among many other functions.
Particularly around menopause, unnecessarily driving estrogen lower is not the goal.
The goal is appropriate hormone production, metabolism, balance and clearance.
And that distinction matters.
A woman experiencing perimenopausal symptoms could simultaneously have declining ovarian estrogen overall, fluctuating estradiol, lower progesterone because she isn't ovulating consistently, and altered estrogen metabolism.
Hormones aren't static numbers. They are a dynamic system.
Estrogen metabolism produces several metabolites through different pathways.
You may hear about 2-hydroxy, 4-hydroxy and 16-hydroxy estrogen metabolites. These pathways are being studied because different metabolites have different biological properties.
However, I would be cautious about the simplistic language sometimes used online describing one pathway as “good estrogen” and another as “bad estrogen”.
Biology is rarely that simple.
What matters is the wider pattern: estrogen exposure, metabolism, methylation, oxidative stress, antioxidant capacity, clearance and the clinical context of the individual woman.
This is also why a single serum estradiol result tells us only part of the story.
Before estrogen reaches the bowel, much of its metabolism takes place in the liver.
The liver uses several biochemical processes to transform compounds so they can be eliminated, including glucuronidation, methylation, sulfation and glutathione-related pathways.
These processes require nutritional building blocks.
B vitamins, amino acids, adequate protein and antioxidant nutrients all play roles in normal metabolic pathways. Foods such as broccoli, cauliflower, cabbage, kale and Brussels sprouts also contain compounds that have attracted considerable research interest in relation to estrogen metabolism.
But this isn't about doing a seven-day “detox”.
Hormone clearance is something your body is doing every day.
Supporting it means supporting the systems responsible for it every day.
Start with the foundations.
Eat a diverse, plant-rich diet containing plenty of fibre and polyphenols. Include cruciferous vegetables regularly if you tolerate them. Support regular bowel movements. Eat enough protein. Limit excessive alcohol. Exercise. Support metabolic health.
And pay attention to persistent digestive symptoms rather than viewing them as completely separate from hormonal health.
In some cases, particularly where symptoms are significant or persistent, I may investigate both the hormonal picture and gastrointestinal function rather than treating them as two unrelated systems.
Because sometimes the question isn't simply:
“How much estrogen do you have?”
It is:
“Where is that estrogen going?”
This is where I would urge caution.
DIM, calcium-D-glucarate, sulforaphane, NAC, glutathione and various methylation nutrients are commonly discussed in relation to estrogen metabolism.
But more estrogen clearance is not automatically better.
A supplement that may be appropriate for one woman could be completely inappropriate for another — particularly during perimenopause and menopause, when maintaining adequate estrogen can be extremely important.
Before trying to “lower estrogen”, we need to understand what problem we're actually trying to solve.
Is estrogen genuinely high?
Is progesterone relatively low?
Is ovulation inconsistent?
Is there constipation or dysbiosis affecting elimination?
Are there issues with metabolism?
Is the woman taking HRT?
What symptoms are we trying to change?
That is why I prefer test, don't guess where appropriate.
When the clinical picture warrants it, looking beyond standard hormone levels can sometimes provide useful additional information.
Depending on the individual, we may be interested in hormone levels and patterns, estrogen metabolites and the balance between hormones, alongside gastrointestinal factors such as microbiome composition, dysbiosis and beta-glucuronidase activity.
No test should be interpreted in isolation, and specialist functional testing is not a substitute for appropriate medical assessment or routine screening.
But used carefully, testing can help us ask a much better question than simply whether estrogen is “high” or “low”.
Is your body producing, metabolising and eliminating estrogen appropriately for you?
For years, women have been taught to divide symptoms into separate boxes.
Bloating goes in the gut box.
Heavy periods go in the gynaecology box.
Migraines go in the neurology box.
Anxiety goes in the mental health box.
Weight gain goes in the metabolism box.
But the body doesn't work in boxes.
The gut communicates with the liver. The microbiome interacts with hormone metabolism. Hormones influence the brain. Metabolic health influences hormone production. Inflammation can affect all of them.
So if you are struggling with both digestive symptoms and hormonal symptoms, don't assume they are completely unrelated.
Your estrogen may not be the problem.
The problem may be what happens to it next.
And sometimes, understanding the gut is one of the missing pieces in understanding your hormones.
Charmaine Shepherd, IFMCP
Functional Medicine Practitioner
This article is for educational purposes and is not a substitute for individual medical advice. New or unexplained abnormal bleeding, bleeding after menopause, significant pelvic pain, breast changes or other concerning symptoms should always be medically assessed.
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