A new Hungarian study is the first to detect glyphosate directly inside human endometrial tissue — and finds it clustering ominously with a hormone-disrupting mycotoxin in high-grade cancer patients.
For decades, the debate over glyphosate’s health effects has largely played out through epidemiology, animal models, and cell-culture experiments. What has been missing is direct evidence of the herbicide sitting inside the human organs where hormone-driven cancers actually develop. A new cross-sectional study out of Semmelweis University and the Hungarian University of Agriculture and Life Sciences, published in Toxicology Reports, closes part of that gap — and the findings are hard to ignore.
The first look inside the womb
Researchers led by Dr. Márkó Unicsovics recruited 34 women being treated for, or strongly suspected of having, endometrial cancer, alongside 32 age- and BMI-matched control patients with benign gynecological conditions. Blood serum and surgically excised endometrial tissue were collected from every participant and tested for glyphosate using a validated ELISA method, adapted specifically so it could reliably measure the herbicide in solid tissue rather than just blood.
The results mark a genuine first: this is among the earliest studies to detect and quantify glyphosate directly in human endometrial tissue.
Glyphosate accumulates — and cancer patients carry more of it
Two findings stand out.
First, glyphosate concentrations in endometrial tissue were consistently and significantly higher than in blood serum, across every group studied — cancer patients and healthy controls alike. In other words, the womb appears to hold onto glyphosate at levels blood tests alone would never reveal.
Second, when the researchers isolated patients with high-grade endometrial cancer — the most aggressive and dangerous form — both their serum and tissue glyphosate levels were significantly elevated compared with the control group. Patients with low-grade cancer or precancerous lesions did not show the same statistically significant elevation, suggesting the association strengthens with tumor severity. The high-grade subgroup was small (just six patients), so the authors are careful to frame this as a preliminary signal rather than proof — but it’s a striking one.
A toxic partnership: glyphosate and a common grain mold toxin
Perhaps the most provocative finding involves glyphosate’s company. The team cross-referenced their glyphosate measurements against a panel of mycotoxins — natural fungal contaminants that widely taint cereals, feed, and food across Europe — that they’d banked from earlier research on the same patient cohort.
They found a strong positive correlation between endometrial glyphosate levels and endometrial levels of zearalenone (ZEN), a mycotoxin produced by Fusarium fungi that is well known to mimic estrogen in the body. Fumonisin B1 showed a similar positive relationship. Interestingly, two other toxins — ochratoxin-A and alpha-zearalenol — moved in the opposite direction, showing a negative correlation with glyphosate.
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The zearalenone link is the one drawing the most attention. Both glyphosate and zearalenone are recognized endocrine disruptors capable of interacting with estrogen receptors in the body. The endometrium — one of the most hormone-sensitive tissues in the human body — is exactly the kind of environment where this kind of chemical “team-up” could matter most. The authors suggest the two contaminants may have a synergistic effect, each amplifying the other’s disruption of estrogen signaling in tissue that is already prone to hormone-driven malignancy.
Given that Hungarian and broader European surveys have found zearalenone contamination in the vast majority of grain-based feed and food supplies — one national swine feed survey found it in 100% of samples tested — this isn’t an exotic or rare exposure scenario. It’s a realistic, everyday co-exposure for much of the population.
Why glyphosate might matter more than regulators assume
The study’s authors point to an intriguing structural clue for how glyphosate might interfere with human biology: its molecular resemblance to glycine, one of the three amino acids that make up the triple-helix backbone of collagen — the most abundant protein in the body. That structural mimicry raises unresolved questions about whether glyphosate could interfere with collagen synthesis or other basic cellular processes, on top of its documented ability to activate estrogen receptors and stimulate proliferation in estrogen-sensitive cells.
That estrogenic activity is significant because endometrial cancer is fundamentally a hormone-driven disease — fueled by estrogen exposure over time, with risk amplified by obesity, diabetes, and conditions like PCOS that raise estrogen levels. Anything that behaves like a low-dose, chronic estrogen mimic entering that environment deserves scrutiny.
The caveats — and why they don’t erase the signal
The researchers are refreshingly candid about the study’s limits. It is cross-sectional — measuring contaminant levels only at a single point in time, during surgery — so it cannot establish whether glyphosate accumulation preceded tumor development or resulted from it. The high-grade cancer subgroup, where the strongest effects appeared, was small. And the team measured only glyphosate itself, not AMPA, its main breakdown product, which also has documented endocrine-disrupting properties and could reveal a fuller picture of exposure.
None of that erases the core, novel finding: glyphosate is present and elevated in human endometrial tissue, at concentrations exceeding blood levels, and it correlates strongly with a known hormone-mimicking mycotoxin in exactly the patients with the most aggressive disease.
The bottom line
Regulators in Europe re-authorized glyphosate for use through 2033 on the grounds that it poses no significant genotoxic or carcinogenic risk. This study doesn’t settle that argument — the authors themselves stress that their results point to a “potential risk factor or co-factor,” not a proven cause. But it does something regulators’ safety assessments have largely failed to do: it looks for the herbicide inside the actual human tissue where a hormone-driven cancer takes root, rather than relying solely on blood tests, animal models, or theoretical exposure limits.
What it found there — glyphosate concentrated well above blood levels, tracking upward with cancer severity, and moving in lockstep with a known xenoestrogen — is exactly the kind of real-world chemical mixture that current single-substance safety thresholds were never designed to capture. As the authors put it, the toxicological question is no longer just about high-dose acute exposure. It’s about the chronic, low-level, combined presence of environmental contaminants quietly accumulating in the tissues that matter most.
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