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title: "Glyphosate and Gut Health: What the Research Really Says"
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[Home](/Home) > [Articles](https://drdanwool.com/blog) > [Glyphosate & Gut Health ](https://drdanwool.com/blog/glyphosate-gut-health)

Medically reviewed by [Dr. Dan Wool, NMD](https://www.linkedin.com/in/drdanwool/)

 Arizona-licensed Naturopathic Physician and  Gastroenterology Specialist

 Updated: June 4, 2026

Quick Summary:

- Glyphosate is the world's most widely used herbicide and is found in many common foods, including oats, wheat, soy, and legumes.
- Research suggests glyphosate may disrupt the gut microbiome by killing beneficial bacteria while allowing harmful pathogens to thrive — a condition called dysbiosis.
- Current regulatory "safe" limits may not account for long-term, low-dose effects on gut bacteria, and human studies are still limited.
- You can meaningfully reduce your glyphosate exposure through diet, lifestyle choices, and targeted gut support strategies.

## Overview

You have probably heard the name glyphosate. It is the active ingredient in Roundup, the world's best-selling herbicide.

You may also have heard the debate: is it safe? Does it cause cancer? Is it ruining our gut health?

The truth is nuanced. The science is still evolving. But the early evidence is compelling enough that, as a naturopathic gastroenterologist, I think every patient should understand what glyphosate is, how it enters the body, and what it may be doing to the trillions of microorganisms that make up your gut microbiome. This article breaks down the research honestly — without hype on either side.

## What Is Glyphosate?

Glyphosate is a broad-spectrum herbicide first introduced in the 1970s. It works by inhibiting a key enzyme called EPSPS — short for 5-enolpyruvylshikimate-3-phosphate synthase — which is part of the shikimate pathway. This pathway is how plants (and bacteria) produce essential amino acids like phenylalanine, tyrosine, and tryptophan. Because mammals do not use this pathway, glyphosate was long considered safe for humans.

That assumption is being challenged.

Since 1996, when Monsanto introduced "Roundup Ready" genetically modified crops designed to survive glyphosate spraying, its use has exploded. Roughly 8.6 billion kilograms have been applied worldwide since 1974, with two-thirds of that amount used in just the last decade.

Today, glyphosate residues are detected in oats, wheat, soy, legumes, and even the urine of 87 percent of children tested in the United States. It is also used as a pre-harvest desiccant — sprayed directly onto grain crops just before harvest to speed drying — which dramatically increases residue levels in finished food products.

## What the Research Says About Glyphosate and Gut Health

Here is the critical point regulators may have missed: your gut bacteria DO use the shikimate pathway. That means glyphosate can — and likely does — affect your microbiome.

- A 2022 review published in Life (MDPI) analyzed 732 bacterial genomes from the Human Microbiome Project and found that many beneficial gut bacteria carry glyphosate-sensitive EPSPS enzymes. The concern is that glyphosate may selectively harm these beneficial microbes while leaving resistant, opportunistic pathogens like Clostridium perfringens and Salmonella typhimurium relatively unaffected [1].

- A 2023 study published in Environmental Pollution used shotgun metagenomic sequencing in mice exposed to glyphosate at doses approximating the U.S. Acceptable Daily Intake (1.75 mg/kg/day). Researchers found that even at these "safe" doses, glyphosate significantly altered gut microbiota composition — reducing protective Lactobacillus and Bifidobacterium species [2].

- A separate study in Scientific Reports found that glyphosate-based herbicide exposure at the U.S. ADI increased homocysteine levels in offspring — a known cardiovascular risk marker — and disrupted the interaction between the gut microbiome and urinary metabolites [3].

- A 2023 review in Gut Microbiomes (Taylor & Francis) concluded that glyphosate may reduce microbially produced tryptophan — a precursor to serotonin — which could affect mood, gut motility, and intestinal barrier integrity. Reduced tryptophan availability has also been associated with increased severity of IBD symptoms [4].

Taken together, these studies point to a consistent pattern: glyphosate can shift the microbial balance in the gut away from health-promoting bacteria and toward inflammatory, dysbiotic states. Whether this translates directly into human disease at current dietary exposure levels is still being studied, but the mechanistic evidence is building.

## Potential Effects: What Dysbiosis from Glyphosate May Look Like

The gut microbiome influences far more than digestion. It plays a central role in immune regulation, hormone metabolism, neurotransmitter production and intestinal barrier function. When dysbiosis occurs — meaning the loss of microbial diversity and the overgrowth of harmful species — the downstream effects can be wide-ranging.

Based on current research, chronic low-dose glyphosate exposure may contribute to:

- Increased[intestinal permeability (leaky gut)](/leaky-gut), allowing bacterial toxins to enter the bloodstream and trigger systemic inflammation.

- Reduced levels of Lactobacillus and Bifidobacterium, two of the most well-studied beneficial bacterial genera linked to immune regulation and digestive health.

- Decreased tryptophan availability, which may affect serotonin production — as roughly 90 percent of serotonin is made in the gut.

- Potential disruption of [GLP-1](/glp1-peptide-weight-loss) (glucagon-like peptide-1), a hormone involved in blood sugar regulation and satiety, as suggested by emerging animal studies.

- Shifts in gut microbiome composition that resemble patterns seen in [celiac disease](/celiac-disease-treatment) and [inflammatory bowel conditions.](/crohns-disease-treatment)

It is important to emphasize: most of this research has been conducted in animal models. Human clinical trials are limited. The associations are meaningful, but causation has not been definitively established.

## Important Considerations and Concerns

There are real concerns worth acknowledging honestly. First, many studies use doses higher than typical dietary exposure, which limits direct extrapolation to humans. Second, most evidence comes from animal studies; large-scale prospective human trials are still lacking. Third, glyphosate-based herbicide formulations contain additional chemical adjuvants that may have their own biological effects separate from glyphosate alone.

The regulatory picture is also mixed. The U.S. EPA considers glyphosate safe at current exposure limits. The World Health Organization's International Agency for Research on Cancer (IARC) classified it as a "probable human carcinogen" in 2015. The European Union renewed glyphosate approval for 10 years in 2023.

From a naturopathic perspective, the precautionary principle applies here: when emerging evidence suggests potential harm and the mechanism is biologically plausible, reducing exposure is a reasonable and prudent step — especially for those with existing gut conditions.

## What to Expect When Reducing Glyphosate Exposure

Reducing glyphosate exposure is not about perfection — it is about lowering your cumulative toxic burden. Most patients begin to notice improved digestive symptoms, less bloating, and better energy within 4–8 weeks of making meaningful dietary changes. This is likely due to improved microbiome diversity rather than any single intervention.

Gut healing is gradual. Microbiome restoration takes time, typically 3-6 months of consistent dietary and lifestyle changes before significant shifts are measurable.

## Natural Alternatives and Gut-Protective Strategies

You cannot eliminate all exposure to glyphosate, but you can meaningfully reduce it. Here are evidence-supported strategies:

- Choose certified organic produce , especially for the ["Dirty Dozen"](https://www.ewg.org/foodnews/dirty-dozen.php) high-residue crops (oats, wheat, soy, corn, and legumes).

- Buy organic oat products. The [Environmental Working Group](https://ewg.org) has consistently found glyphosate residues in conventional oat-based cereals and foods at levels above what researchers consider safe for children.

- Filter your drinking water. Use a high-quality reverse osmosis or activated carbon filter, as glyphosate has been detected in water supplies.

- Support your microbiome with probiotic-rich foods (yogurt, kefir, sauerkraut, kimchi) and prebiotic fibers (garlic, leeks, asparagus, oats) to help restore microbial diversity.

- Consider targeted probiotics. Lactobacillus and Bifidobacterium species — the ones most vulnerable to glyphosate — are widely available in quality probiotic supplements.

- Reduce processed grain intake. Most conventional processed foods contain wheat, corn, or soy derivatives that are heavily treated with glyphosate.

- Support detoxification pathways with adequate dietary fiber, hydration, and nutrients like glycine, glutathione precursors (N-acetyl cysteine, alpha-lipoic acid), and magnesium.

## The Bottom Line on Glyphosate and Gut Health

Glyphosate is everywhere. It is in the food supply, the water, and — based on urine testing data — likely in most Americans' bodies right now. The research does not yet prove that dietary glyphosate exposure causes specific gut diseases in humans at current intake levels. But the mechanistic evidence is credible and growing: glyphosate can disrupt the gut microbiome in ways that are biologically meaningful.

As a naturopathic physician specializing in gastroenterology, I believe we should apply the precautionary principle. Reducing your exposure through organic food choices, quality water filtration, and gut-supportive nutrition is low-risk, practically achievable, and increasingly well-supported by emerging science. Your gut microbiome is one of the most important determinants of your long-term health. It deserves the benefit of the doubt.

## Frequently Asked Questions about Glyphosate and Gut Health

### Is glyphosate really in my food?

Quick Answer: Yes. Glyphosate residues are commonly detected in oats, wheat, soy, corn, legumes, and many processed foods made from these crops. The Environmental Working Group has found glyphosate in popular oat-based cereals, often at levels researchers consider concerning for children.

Full Answer: Glyphosate is the most widely used herbicide in the world, and its residues persist in many conventionally grown crops. It is used both as a weed killer and as a pre-harvest desiccant — meaning it is sprayed directly on crops like oats and wheat shortly before harvest to speed drying. This dramatically increases residue levels in finished foods. Urine testing studies have detected glyphosate in approximately 87 percent of children in the United States. Buying certified organic versions of high-risk foods — oats, wheat, soy, corn, and legumes — is the most effective way to reduce your dietary exposure.

### Can glyphosate cause leaky gut?

Quick Answer: Possibly. Animal studies suggest glyphosate may increase [intestinal permeability (leaky gut)](/leaky-gut) by disrupting the gut microbiome and reducing tight junction integrity. Human data is limited, but the biological mechanism is plausible.

Full Answer: Leaky gut — or increased intestinal permeability — occurs when the tight junctions between intestinal cells become compromised, allowing bacterial toxins and undigested particles to enter the bloodstream. Research in animal models shows that glyphosate-induced dysbiosis can weaken this barrier. Specifically, the reduction in beneficial Lactobacillus species and Bifidobacterium — both critical for maintaining intestinal barrier integrity — may play a central role. Studies also suggest glyphosate may reduce tryptophan availability, which is needed for gut lining repair and serotonin production. While we lack large human clinical trials confirming this mechanism, the evidence is mechanistically compelling.

### Does glyphosate affect serotonin and mood?

Quick Answer: Potentially. Glyphosate may reduce tryptophan production in gut bacteria. Since roughly 90 percent of serotonin is made in the gut from tryptophan, disruption of gut bacteria could indirectly impact mood, anxiety, and depression.

Full Answer: The gut-brain axis is a bidirectional communication system linking the gut and central nervous system. Gut bacteria produce a significant portion of the body's serotonin using tryptophan, which is synthesized via the shikimate pathway — the same pathway glyphosate inhibits. Research published in Gut Microbiomes found that glyphosate reduces microbially produced tryptophan, potentially limiting serotonin and GABA production in the gut. Separately, animal studies have shown glyphosate-exposed mice and their offspring demonstrate altered neurological behavior, reduced kynurenine levels, and increased anxiety-like behavior. While direct human evidence for glyphosate-mood connections remains limited, the gut-brain-microbiome mechanism is increasingly well-supported.

### Is glyphosate exposure linked to celiac disease or IBS?

Quick Answer: Some researchers believe glyphosate may be an environmental trigger for celiac disease and IBS by disrupting beneficial gut bacteria and gut barrier function. The association is suggestive but not yet definitively proven in humans.

Full Answer: Multiple review papers have noted that glyphosate-induced gut microbiome changes — including reductions in Rothia species that help break down gluten proteins and reductions in Lactobacillus — resemble the microbial patterns seen in celiac disease. A review in Frontiers in Microbiology proposed that glyphosate could act as an environmental trigger for celiac disease, particularly in genetically susceptible individuals. For [IBS,](/ibs-treatment) the link runs through dysbiosis and increased intestinal permeability, both of which have been observed in glyphosate-exposed animal models. These are plausible associations worth investigating further, and for patients with existing digestive conditions, reducing glyphosate exposure is a reasonable precautionary step.

### What is the difference between glyphosate and Roundup?

Quick Answer: Glyphosate is the active herbicidal ingredient. Roundup is the commercial product that contains glyphosate plus chemical adjuvants (surfactants and solvents). Research suggests the full Roundup formulation may be more toxic than glyphosate alone due to these additives.

Full Answer: Glyphosate (N-(phosphonomethyl)glycine) is the herbicidal molecule itself. Roundup is a branded herbicide manufactured by Bayer (formerly Monsanto) that contains glyphosate along with proprietary adjuvants — typically surfactants designed to help the herbicide penetrate plant tissue. Several studies have found that Roundup formulations produce greater oxidative stress and cell toxicity than pure glyphosate alone, suggesting the adjuvants amplify harmful effects. This distinction matters for interpreting research: studies using pure glyphosate may underestimate real-world effects of commercial herbicide products. When looking at dietary exposure, most human exposure is to residues from glyphosate-based herbicide formulations, not pure glyphosate.

### How can I test my glyphosate exposure levels?

Quick Answer: Urine-based glyphosate testing is available through several functional medicine labs and can measure your recent glyphosate exposure. It is not a routine standard-of-care test but can be useful for high-exposure individuals or those with unexplained gut symptoms.

Full Answer: Because glyphosate is water-soluble and excreted primarily through urine, urinary glyphosate testing reflects recent dietary and environmental exposure. Labs offering this test include Great Plains Laboratory (now Mosaic Diagnostics), Genova Diagnostics, Vibrant Wellness and others offering environmental toxin panels. (Note: I have no ties to these companies). Reference ranges are still being established, but studies have documented rising urinary glyphosate levels in the U.S. population between 1993 and 2016. If you have significant gut symptoms, unexplained inflammation, or high consumption of conventionally grown grains and legumes, discussing glyphosate urine testing with your naturopathic physician may be worthwhile. Testing is most useful when paired with a dietary and environmental exposure history.

### Does cooking or washing food remove glyphosate?

Quick Answer: Washing removes surface residues partially, but glyphosate is absorbed into plant tissue systemically — meaning it cannot be fully washed off. Cooking may reduce some residues but does not eliminate them.

Full Answer: Unlike contact pesticides that sit on the surface of produce, glyphosate is a systemic herbicide. It is taken up into the vascular tissue of plants, meaning it becomes incorporated into the grain, bean, or vegetable itself rather than just coating the outside. Studies have shown that washing conventional oats, wheat, or soy does not meaningfully reduce glyphosate residues. Cooking and processing can reduce some levels — for example, baking bread reduces glyphosate content to a degree — but residues remain detectable in finished products. The most reliable way to reduce dietary glyphosate intake is to choose certified USDA organic foods, particularly for high-risk crops like oats, wheat, soy, corn, and legumes.

## Are You Ready to Fix Your Gut?

Struggling with your gut health? [Dr. Dan Wool](/about) offers personalized, natural solutions at his Scottsdale naturopathic practice.[Book a free 15-minute discovery call today](/booking) and take the first step toward lasting digestive relief.

Disclaimer:

For educational purposes only — not medical advice, diagnosis, treatment or advertising for consumer purchase. Dr. Dan Wool and affiliates make no effectiveness claims about supplements, hormones, peptides or other therapeutics beyond cited clinical evidence and regulatory approval. Always consult a qualified healthcare provider before starting, changing, or stopping any medical or wellness program.

About the Author

## Dr. Dan Wool, NMD

[Dr. Dan Wool](/about) is a naturopathic doctor who specializes in gastroenterology, hormones and men's health in Scottsdale, Arizona. [Set up a free 15-minute discovery call with Dr. Wool today! ](https://drdanwool.com/booking)

[Read more about Dr. Wool's Gut Health Journey](/about)

## References:

[1] Lehmann I, et al. "Does Glyphosate Affect the Human Microbiota?" Life (MDPI). 2022;12(5):707. Available at: [https://pmc.ncbi.nlm.nih.gov/articles/PMC9145961/](https://pmc.ncbi.nlm.nih.gov/articles/PMC9145961/)

[2] Winstone JK, et al. "Low-dose glyphosate exposure alters gut microbiota composition and modulates gut homeostasis." Environmental Pollution. 2023. Available at: [https://www.sciencedirect.com/science/article/abs/pii/S1382668923000911](https://www.sciencedirect.com/science/article/abs/pii/S1382668923000911)

[3] Mesnage R, et al. "Low-dose exposure of glyphosate-based herbicides disrupts the urine metabolome and its interaction with gut microbiota." Scientific Reports. 2021;11:3431. Available at: [https://www.nature.com/articles/s41598-021-82552-2](https://www.nature.com/articles/s41598-021-82552-2)

[4] Nielsen LN, et al. "Impact of glyphosate (Roundup) on the composition and functionality of the gut microbiome." Gut Microbiomes. 2023;15(1). Available at: [https://www.tandfonline.com/doi/full/10.1080/19490976.2023.2263935](https://www.tandfonline.com/doi/full/10.1080/19490976.2023.2263935)

[5] Barnett JA, Gibson DL. "Separating the Empirical Wheat From the Pseudoscientific Chaff: A Critical Review of the Literature Surrounding Glyphosate, Dysbiosis and Wheat-Sensitivity." Frontiers in Microbiology. 2020;11:556729. Available at: [https://www.frontiersin.org/journals/microbiology/articles/10.…