Glyphosate Food

Quick answer: Independent testing by the Environmental Working Group (EWG) found glyphosate residues in Cheerios and in most other oat-based foods it sampled. Some products tested above EWG's own child-protective health benchmark of 160 parts per billion (ppb). Those same levels are far below the legal limits the EPA sets for glyphosate in food, and General Mills has said its products comply with regulatory safety standards. So the honest answer is contested: the residues are real, but whether they matter at these levels is a genuine scientific dispute, not a settled fact in either direction.

What testing found in Cheerios

Oat-based breakfast foods of the kind tested for glyphosate residues

Glyphosate is the most widely used herbicide in the world, best known as the active ingredient in Roundup. It ends up in oat products partly because some farmers spray it on oats shortly before harvest to dry the crop, a practice called desiccation.

In EWG's testing of oat-based cereals, several Cheerios products carried measurable residues: Honey Nut Cheerios Medley Crunch tested at 833 ppb, Chocolate Peanut Butter Cheerios at 400 ppb, and Multi Grain Cheerios at 216 ppb. For comparison, EWG's health benchmark for children's daily exposure is 160 ppb. That benchmark is EWG's own calculation, built with extra safety margins for children. It is not a government limit, and exceeding it is not the same as exceeding a legal or medically established threshold.

Worth knowing: EWG's follow-up testing in 2023 found glyphosate levels in oat-based products had dropped substantially compared with its earlier rounds of testing.

Glyphosate in other oat-based foods

The findings were never just about Cheerios. EWG reported that over 95% of the popular oat-based food samples it tested contained glyphosate, with products marketed to children among the higher results. Products from its testing included:

Nature Valley Crunchy Granola Bars, Maple Brown Sugar: 566 ppb
Nature Valley Granola Cups, Almond Butter: 529 ppb
Nature Valley Baked Oat Bites: 389 ppb
Nature Valley Crunchy Granola Bars, Oats and Honey: 320 ppb
Nature Valley Crunchy Granola Bars, Peanut Butter: 312 ppb
Nature Valley Granola Cups, Peanut Butter Chocolate: 297 ppb
Nature Valley Fruit & Nut Chewy Trail Mix Granola Bars, Dark Chocolate Cherry: 275 ppb
Nature Valley Protein Granola, Oats and Dark Chocolate: 261 ppb
Nature Valley Soft-Baked Oatmeal Squares, Blueberry: 206 ppb
Fiber One Soft-Baked Cookies, Oatmeal Raisin: 204 ppb
Nature Valley Granola, Peanut Butter Creamy & Crunchy: 198 ppb
Nature Valley Biscuits with Almond Butter: 194 ppb

Beyond that list, testing by various groups has reported glyphosate residues in granola, instant and whole oats, other cereals, snack bars, orange juice, crackers, cookies, and chips from many mainstream brands. Because glyphosate is used so widely, it has also been detected in the environment: one widely cited analysis found it in 75% of air and rain samples tested, and a 2017 study reported that it shows up regularly in human urine. Detection, though, is not the same as harm. Modern labs can measure vanishingly small amounts, and the health question is about dose.

Why the same numbers read two different ways

EWG's health benchmark

EWG built its 160 ppb benchmark by starting from California's risk assessment for glyphosate and adding an extra margin of safety for children. By design, it is a highly conservative number. EWG's argument is that for a herbicide with unresolved cancer questions, children's food should carry the widest possible safety buffer.

EPA's legal tolerances and General Mills' response

The EPA sets legally enforceable tolerances for glyphosate residues in food, and its tolerance for oats is far higher than EWG's benchmark, by orders of magnitude. Measured against the legal standard, every product in EWG's testing passed with room to spare. That is the basis for General Mills' consistent public position: its products are safe and comply with regulatory limits. Both sides are describing the same measurements. The disagreement is about which yardstick to use, and that traces back to a deeper scientific split.

Is glyphosate a carcinogen? The IARC vs. EPA split

Agricultural crop field of the kind commonly treated with glyphosate herbicide

This is the real story behind every glyphosate headline. In 2015, the World Health Organization's International Agency for Research on Cancer (IARC) classified glyphosate as Group 2A, "probably carcinogenic to humans," based on limited evidence in humans and stronger evidence in laboratory animals. The EPA, reviewing a broader set of data including regulatory studies, concluded the opposite: that glyphosate is "not likely to be carcinogenic to humans" when used as directed, and regulators in several other countries have reached similar conclusions.

Part of the gap is methodological. IARC asks whether a substance is capable of causing cancer at any exposure level, while regulators ask whether it is likely to cause cancer at real-world exposure levels. Research on other possible effects, including on gut bacteria and the endocrine system, is ongoing and not conclusive. Reasonable scientists sit on both sides, which is exactly why this topic stays contested.

How to reduce glyphosate exposure

Person eating a bowl of breakfast cereal

If you would rather not wait for the science to settle, exposure is straightforward to reduce:

Choose organic when it matters to you. Glyphosate is not permitted in organic farming, so organic oat products are much less likely to carry residues.
Vary your diet. Eating a range of foods keeps any single source, oats included, from dominating your exposure.
Lean on whole foods. Heavily processed grain products have more opportunities to pick up residues along the supply chain.
Wash produce properly. Rinsing under running water reduces pesticide residues on many fruits and vegetables, and research from the Connecticut Agricultural Experiment Station found commercial produce washes work about as well as plain water. A study in the journal Food Control found a 10% salt water soak removed significantly more pesticide residue than water alone. Rinse with clean water afterward.
Stay informed. Testing results and regulatory reviews continue to come out, and as EWG's 2023 follow-up showed, the numbers can move in a good direction.

Glyphosate in drinking water

Because glyphosate is applied over so much farmland, it can run off into surface water and turn up at low levels in water supplies, which is why it is one of the contaminants people ask us about most. If you want to cover that base at home, see our glyphosate and Roundup water filter page for how filtration handles it.

The bottom line

Glyphosate residues in Cheerios and other oat foods are real and well documented, they sit above the strictest advocacy benchmarks and below the legal limits, and the world's scientific agencies genuinely disagree about what the trace amounts mean. You do not need to panic over a bowl of cereal, and you also do not have to accept any exposure you can reasonably avoid. Choosing organic oats, varying your diet, and filtering your drinking water are all low-cost moves.

On the water side, that is our lane: the Pure XP pitcher is independently tested to reduce lead, PFAS, chlorine, and over 99.9% of microplastics, and the Pure XP Dispenser brings the same filtration to larger households. You can compare all of our pitchers and dispensers in one place.

Sources

Cheerios, Honey Nut Cheerios, Nature Valley, and Fiber One are trademarks of General Mills, Inc. Roundup is a trademark of Monsanto Technology LLC (Bayer). Other product names mentioned are trademarks of their respective owners. This article is for educational purposes and is not medical advice.

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