CDC Finds Glyphosate in 80% of US Urine Samples – and Kids Are Most Exposed

If you eat a typical American diet, there is a good chance you are carrying traces of the world's most widely used weedkiller inside you. Data released by the Centers for Disease Control and Prevention found glyphosate, the active ingredient in Roundup and hundreds of other herbicides, in the urine of more than 80% of Americans tested. For anyone already wondering whether everyday chemical exposures might be affecting their gut, their immune function, or their long-term health, this finding lands differently than another abstract environmental statistic.

Key takeaways:

• More than 80% of US urine samples contained detectable glyphosate, including samples from children as young as six.
• Diet is the primary exposure route, meaning food choices are the most actionable lever most people have.
• The data documents widespread exposure but does not establish what those levels do to human health; the cancer link remains contested between major agencies.
• A federal appeals court has already ordered the EPA to reconsider its previous finding that glyphosate poses no cancer risk.

Glyphosate turns up in 80% of urine samples in CDC's first large national survey

The CDC's National Health and Nutrition Examination Survey (NHANES) tested 2,310 urine samples drawn from a group of Americans designed to represent the broader US population, and 1,885 of those samples, or just over 80%, contained measurable glyphosate. That figure is striking partly because this is the first time the CDC has conducted a systematic, nationally representative examination of glyphosate levels in the American body. Private researchers and academics have been flagging high readings for years, but without the CDC's population-scale methodology, the full picture was missing.

Almost a third of the participants were children between the ages of six and 18. That detail matters: as pediatric health researcher Phil Landrigan has noted, children are more heavily exposed to pesticides than adults because, pound for pound, they drink more water, eat more food, and breathe more air. Whatever is in the food supply reaches children at a higher effective dose.

Why children and people with diet-related health concerns should pay attention

Glyphosate is not a niche agricultural product. More than 200 million pounds of it are applied by US farmers every year, making it the most widely used herbicide in history. It is sprayed on genetically engineered crops like corn and soybeans, which are engineered specifically to tolerate it, and it is also applied to non-genetically engineered crops like wheat and oats as a desiccant (a drying agent used just before harvest). That second use is particularly relevant to diet: it means glyphosate residues have been found in staple foods many people eat daily, including oats, and in baby food.

For people managing gut-related conditions such as irritable bowel syndrome (IBS) or inflammatory bowel disease (IBD), or for anyone tracking how their diet affects their digestion, the gut is the first point of contact with whatever residues are present in food. Research into how glyphosate might interact with the gut microbiome is still early, but the question is being asked. The steady rise in glyphosate residues in the food supply, and now in human urine, means this is not a theoretical exposure.

How the CDC measured glyphosate exposure across the US population

The data comes from the CDC's NHANES program, which is designed specifically to be representative of the US population rather than a convenience sample. The 2,310 participants spanned age groups, with nearly a third under 18. Urine is the standard biological matrix for measuring glyphosate exposure because the compound is water-soluble and is excreted relatively quickly, meaning urine levels reflect recent, real-world exposure rather than long-term accumulation. The data, released as part of NHANES's ongoing national exposure reporting, showed not just that glyphosate is detectable but that its prevalence has been rising steadily since the 1990s.

What switching to organic food may (and may not) do for your exposure

The finding that diet is the primary exposure route for children is the most practically relevant piece of information in this whole picture. A PubMed-indexed study on organic diet intervention found that switching to an organic diet rapidly and significantly reduced urinary glyphosate levels in both children and adults, which suggests that food, not ambient environmental exposure, is driving most of what the CDC measured.

That does not mean an organic diet eliminates all risk or that conventional food is proven to cause harm at the levels detected. What it means is that for someone already motivated to reduce their pesticide exposure, the dietary lever appears to be real and responsive. Whether reducing glyphosate exposure translates to measurable health benefits remains unproven; no study has yet demonstrated that lowering urine glyphosate levels improves clinical outcomes. This is worth asking a doctor about, particularly for families with young children or individuals with conditions affecting gut permeability.

The contested cancer question and what regulators are still working out

The reason glyphosate exposure data feels urgent rather than routine is the unresolved cancer question. In 2015, the International Agency for Research on Cancer (IARC), the cancer research arm of the World Health Organization, classified glyphosate as a probable human carcinogen. A 2019 analysis co-authored by epidemiologist Lianne Sheppard found a compelling association between glyphosate exposure and non-Hodgkin lymphoma (a cancer of the immune system's lymph cells), with a 41% increased risk among highly exposed individuals.

The US Environmental Protection Agency, by contrast, had concluded that glyphosate is not likely to be carcinogenic to humans. But that position was challenged in court: a federal appeals court vacated the EPA's safety determination in June 2022, ordering the agency to conduct further consideration of glyphosate's risks. The EPA is now engaged in an ongoing reevaluation, with a new human health risk assessment expected around late 2026. Bayer, which acquired Monsanto and its glyphosate products, maintains that the herbicide is safe and that residues at detected levels pose no health risk.

As epidemiologist Lianne Sheppard put it: "I expect that the realization that most of us have glyphosate in our urine will be disturbing to many people."

Common Questions

Does glyphosate in my urine mean I have been harmed? Not necessarily. The CDC data documents exposure but makes no observation about what those levels mean for health outcomes. The relationship between detectable urine levels and actual disease risk is still being studied and is not established at the concentrations most people carry.

Is organic food reliably lower in glyphosate? Research suggests yes: one intervention study found that switching to an organic diet significantly reduced glyphosate levels in urine within days. Certified organic standards prohibit glyphosate use, though cross-contamination can occur.

Are children more at risk than adults? Children are exposed to higher relative doses because they eat, drink, and breathe more per unit of body weight than adults. Nearly a third of the CDC's sample was under 18, and glyphosate residues have been found in baby food, making this a legitimate concern for parents to raise with pediatricians.

When will there be a clearer regulatory answer in the US? The EPA is conducting a formal reevaluation of glyphosate's human health risks following the 2022 court order. A completed risk assessment is not expected before late 2026. Until then, the scientific and regulatory debate remains genuinely open.

References

1. Maria Ospina, Andre Schütze, Pilar Morales-Agudelo, Meghan Vidal, Lee-Yang Wong, Antonia M. Calafat (2022). Exposure to glyphosate in the United States: Data from the 2013–2014 National Health and Nutrition Examination Survey. Environment International. https://doi.org/10.1016/j.envint.2022.107620
2. What's New Archives – July 19, 2022 | National Exposure Report – CDC. cdc.gov. https://www.cdc.gov/nchs/nhanes/whats_new/whats_new_archives/july_19_2022.htm
3. John Fagan, Larry Bohlen, Sharyle Patton, Kendra Klein (2020). Organic diet intervention significantly reduces urinary glyphosate levels in U.S. children and adults. Environmental Research. https://doi.org/10.1016/j.envres.2020.109898
4. Glyphosate | US EPA. epa.gov. https://www.epa.gov/ingredients-used-pesticide-products/glyphosate
5. EPA Releases Glyphosate Human Health Open Literature Search Document for Public Feedback. epa.gov. https://www.epa.gov/ingredients-used-pesticide-products/epa-releases-glyphosate-human-health-open-literature-search-document