Heirloom vs Modern Wheat: What Glyphosate Testing Actually Shows

Most American wheat is sprayed with glyphosate days before harvest. Not on the field across the season. Directly on the grain, hours before it goes into the combine. The practice is called pre-harvest desiccation, and it's why wheat-based products consistently test positive for glyphosate residue at the consumer level.

The European Union banned this practice in most member states. Italy banned it in 2016. That regulatory gap is the reason imported European wheat tests cleaner than domestic American wheat, even when both are labeled organic at the retail level.

Here's what the published testing actually shows, what Jovial Foods (the einkorn brand most often cited as the cleanest option in the U.S. market) discloses about their grain, and how that compares to the mainstream organic flour brands most people reach for.

How glyphosate gets into conventional wheat

Roundup, the brand name for glyphosate-based herbicides, is sprayed on wheat fields 7 to 14 days before harvest. The reason isn't pest control. It's drying. Glyphosate kills the plant on contact, which dries the grain uniformly and lets the combine harvest faster.

The Health Research Institute, a Fairfield, Iowa lab founded by John Fagan, has documented the practice extensively. Their reporting estimates that roughly 70 percent of wheat and barley acreage in the Dakotas and Montana is desiccated with glyphosate before harvest.

The U.S. imports a large fraction of its wheat from Canada. Manitoba data referenced in European Parliament records puts the figure even higher: 90 to 95 percent of Manitoba wheat acres are sprayed pre-harvest with glyphosate.

This is the contamination mechanism. The wheat isn't accidentally exposed to glyphosate runoff. It's deliberately sprayed days before it becomes flour.

What the testing actually shows in mainstream products

The Environmental Working Group published the most-cited residue testing in August 2018. They tested 45 conventional oat samples and 16 organic oat samples. 31 of 45 conventional samples contained glyphosate at levels of 160 parts per billion or higher. The maximum detected was Quaker Oatmeal Squares Honey Nut at 2,837 parts per billion.

Five of the 16 organic oat samples carried trace glyphosate at 10 to 30 parts per billion. The likely source: drift contamination from neighboring conventional fields, not deliberate use. Bob's Red Mill and Nature's Path were among the brands with detectable residue.

Wheat-specific residue data from the U.S. is thinner than the oat data. The USDA Pesticide Data Program tests for thousands of pesticide compounds, but glyphosate testing has historically focused on soybeans rather than wheat. UK government testing of wholemeal bread, cited via the Detox Project, has documented residues sometimes exceeding 500 parts per billion.

A 2020 study by Fagan and colleagues, published peer-reviewed, examined what happens when people switch to a 100 percent organic diet. Urinary glyphosate levels dropped more than 70 percent in one week. The study established that food, not environmental exposure, is the dominant glyphosate intake pathway for most Americans.

The Italy difference

Italy placed important restrictions on glyphosate use in August 2016. The restrictions specifically banned glyphosate use as a pre-harvest treatment for cereals, the same desiccation practice that drives U.S. wheat contamination. Pesticide Action Network Europe documented the rule change.

This is the regulatory backdrop for Italian-grown wheat. The pre-harvest spraying that produces measurable glyphosate in U.S. wheat is structurally absent from Italian-grown wheat. That's not marketing language. It's the legal status of the herbicide application.

Jovial Foods sources their einkorn from Italian farms and mills the grain in Italy. The supply chain bypasses the dominant U.S. contamination pathway entirely.

What Jovial actually tests for

Jovial publishes Detox Project glyphosate-residue-free certification on most of their products. The Detox Project's threshold is 10 parts per billion, the standard government-recognized limit of detection for glyphosate testing. Detox Project certification is stricter than USDA Organic, which permits trace residues up to product-specific tolerances rather than requiring non-detect.

Independent third-party testing has corroborated the published certification. Tamara Rubin, who runs Lead Safe Mama, tested Jovial 100 percent Organic Einkorn All-Purpose Flour in June 2024 and found non-detect for the four metals of concern: lead, cadmium, mercury, and arsenic. A December 2025 retest showed trace cadmium and lead, both around 5 parts per billion, which is just over the laboratory's limit of detection.

That's an honest result. Not zero. Trace at the detection limit is the realistic floor for any agricultural product, and it's well below the levels associated with health endpoints.

Jovial does not publicly publish mycotoxin testing data (DON or vomitoxin, ochratoxin A). The Italian regulatory framework constrains mycotoxin levels for grain entering the food supply, but Jovial's website doesn't include batch-by-batch mycotoxin reports the way it does for glyphosate. If you want that data, you'd need to ask the company directly.

Honest disclosure: Jovial isn't perfect

The same independent tester who confirmed clean einkorn flour also tested other Jovial product lines and found problems.

Tamara Rubin's 2024 testing of Jovial Organic Grain-Free Cassava Pasta found 77 parts per billion lead. The brown rice pasta line tested with elevated cadmium and arsenic. The sourdough einkorn crackers tested positive for lead.

This doesn't change the einkorn flour result. Cassava is a tuber crop with documented heavy metal accumulation issues across the entire category, not a Jovial-specific problem. Brown rice from any source absorbs arsenic from groundwater. The cracker result is harder to explain and worth flagging.

The honest framing: Jovial einkorn flour tests clean in independent third-party labs and carries Detox Project glyphosate certification. Other Jovial product lines have category-specific contamination issues that affect those products specifically. If you're switching for the einkorn flour, that's a defensible decision. If you're buying every Jovial SKU on the assumption that the brand is uniformly clean, you'd be making a brand-trust assumption the testing doesn't fully support.

Einkorn is not modern wheat

The genetics of einkorn are different from modern bread wheat in ways that matter for nutrition, digestibility, and how the grain has been bred.

Chromosome count

Einkorn (Triticum monococcum) is diploid, with 14 chromosomes. Modern bread wheat is hexaploid, with 42 chromosomes. The 2023 einkorn genome sequencing published in Nature confirmed that einkorn was never hybridized; it's the original cultivated wheat species, domesticated approximately 10,000 years ago in the Fertile Crescent.

Modern bread wheat is the result of two ancient hybridization events plus a century of selective breeding for yield, dwarfing, and protein content optimized for industrial bread baking. About 1 percent of the modern bread wheat A subgenome originates from einkorn ancestors.

Carotenoids and lutein

Einkorn contains roughly 3 to 4 times more lutein than modern wheats, per Abdel-Aal's published work on einkorn pigments. Lutein is the carotenoid associated with macular health.

Protein

Einkorn runs 15 to 20 percent protein on a dry-weight basis, per the 2023 review in PMC (Ancient Wheats Nutritional Review). Modern bread wheat sits at 10 to 13 percent. Higher protein doesn't mean better in every application; it means different baking behavior and different nutritional density per gram.

Gluten structure

A 2020 study in Frontiers in Nutrition tested einkorn and durum gliadins under simulated gastrointestinal digestion. Einkorn gliadins were markedly more degraded after digestion than durum gliadins, and showed reduced ability to activate T cells in vitro.

Important caveat: einkorn is not safe for celiac disease patients. The digestibility studies are in vitro on isolated gluten fractions. Einkorn still contains gluten. The reduced immunogenicity in lab models does not translate to celiac safety, and no responsible source recommends einkorn for diagnosed celiac. For non-celiac wheat sensitivity, the published evidence suggests einkorn may be tolerated when modern wheat is not, but that's a personal decision made with a doctor.

How other US brands compare

If Jovial is the cleanest option in the U.S. market, where does that leave the brands more people actually buy from? The table below summarizes sourcing practice and what each brand actually publishes; the detail follows.

King Arthur Baking

The most widely distributed organic flour brand. Their position: they test internally for pesticide residues including glyphosate. Their published documentation: there isn't any. The thresholds, the test methods, and the batch results are not on their website. This isn't an accusation; it's a documentation gap. King Arthur sources from U.S. wheat that may or may not be desiccated. Without published test data, the consumer takes the brand's word for it.

Bob's Red Mill

Faced a 2018 class action over glyphosate in oats. The company says oat suppliers stopped using glyphosate as a desiccant. No public batch testing for any flour product. The 2018 EWG testing found 10 to 30 ppb glyphosate in some Bob's Red Mill organic oat products from drift contamination. Their organic einkorn, spelt, and emmer lines exist but don't carry independent third-party glyphosate certification.

Cairnspring Mills (Washington State)

The strongest U.S. peer to Jovial on the practice question. Their farmers are contractually prohibited from using glyphosate as a harvest aid. Cairnspring achieved Regenerative Organic Certification and identifies the specific wheat varieties on their packaging. They don't publish batch-by-batch residue testing, but the contractual ban removes the contamination mechanism upstream.

Sunrise Flour Mill (Minnesota)

Heritage wheat varieties (Turkey Red, White Sonora). Their products are labeled "grown without glyphosate" with private testing referenced but not publicly posted. Worth a direct ask if you're buying.

Hayden Flour Mills (Arizona)

Heirloom varieties named on every package: White Sonora, Rouge de Bordeaux, einkorn, Blue Beard durum. Variety transparency is the strongest in the U.S. market. Glyphosate residue testing isn't published.

Anson Mills (South Carolina)

Specialty heritage seed bank for chefs. Red May wheat and other heirlooms. Strong on variety provenance, no public glyphosate test data.

Maine Grains

Direct relationships with regional farmers, public testing for moisture and Fusarium contamination, no glyphosate residue panel published.

The pattern: the U.S. heirloom and regenerative segment is small, transparent on practice, and varied on whether they publish residue test data. Jovial's combination of European sourcing (which removes the desiccation pathway) plus published Detox Project certification is rare. Cairnspring's contractual ban on harvest-aid glyphosate is the closest U.S. equivalent.

What this means in practice

If you bake bread weekly and buy the cheapest organic flour at the grocery store, you're getting wheat that may carry residue from drift contamination but probably wasn't desiccated. That's better than conventional. It's not the same as Italian-grown. And if you buy grain and mill it yourself, the mill's materials matter as much as the wheat: our guide to microplastics in flour and plastic-free grain mills covers what to look for in the grain path.

Wheat residue is one variable in a bigger picture. Microplastics are the other contaminant reaching your plate, and it helps to understand what chemicals are leaching into your food from packaging and cookware. If you're rebuilding the kitchen around cleaner inputs, our best non-toxic cookware guide covers the surfaces your food actually touches.

If you're switching for a specific reason (autoimmune workup, gut symptoms with modern wheat, or just wanting to know what's in your flour), the available evidence supports two specific moves:

• For the cleanest available residue profile: Jovial einkorn or another Italian-grown organic wheat. The combination of Italy's 2016 desiccation ban, EU pesticide regulation, and published third-party certification (Detox Project for glyphosate, independent testing for heavy metals) is what the published data actually supports.
• For domestic alternatives that block the desiccation mechanism upstream: Cairnspring Mills is the strongest candidate. Hayden Flour Mills, Anson Mills, Sunrise Flour Mill, and Maine Grains are reasonable second-tier options based on practice transparency, even without published residue data.

The mainstream organic flour at the grocery store is better than conventional. But "organic" doesn't mean "tested clean," and "tested clean" is what the underlying question actually asks.

The one thing to do this week

If you bake regularly and your current flour doesn't carry independent residue testing, swap one bag for one that does. A 2-pound bag of Jovial all-purpose einkorn flour costs about $13 at the time of writing. Use it for a week of normal baking. Notice if anything changes in how you feel.

If nothing changes, you've spent $13 on better-documented flour and you keep using it. If something changes, you've identified a variable worth controlling for in your kitchen long-term. Either way, the data point is yours.

Frequently asked questions

Why is glyphosate sprayed on wheat?

Conventional wheat is sprayed with glyphosate 7 to 14 days before harvest as a desiccant. The herbicide kills the plant on contact, drying the grain uniformly and allowing faster combine harvest. The Health Research Institute estimates roughly 70 percent of U.S. wheat and barley acreage is desiccated this way, and approximately 90 to 95 percent of Manitoba wheat acres in Canada follow the same practice.

Does Jovial einkorn have glyphosate?

Jovial Foods publishes Detox Project glyphosate-residue-free certification on most of their products, meaning testing finds no detectable glyphosate down to 10 parts per billion. Their einkorn is grown and milled in Italy, where pre-harvest glyphosate desiccation has been restricted since 2016. Independent third-party heavy metal testing has shown non-detect or trace levels at the laboratory limit of detection.

Is einkorn safe for celiac disease?

No. Einkorn contains gluten and is not safe for diagnosed celiac patients. Studies have shown einkorn gliadins are more thoroughly digested than modern wheat gliadins in laboratory simulations, and may be tolerated by people with non-celiac wheat sensitivity, but this is not the same as celiac safety. Anyone with celiac disease should treat einkorn the same as any other wheat product.

What's the difference between einkorn and modern wheat?

Einkorn is the original cultivated wheat species (Triticum monococcum), domesticated approximately 10,000 years ago. It has 14 chromosomes (diploid) and was never hybridized. Modern bread wheat is hexaploid with 42 chromosomes and is the product of two ancient hybridization events plus a century of selective breeding. Einkorn contains 3 to 4 times more lutein, runs 15 to 20 percent protein versus 10 to 13 percent for modern wheat, and has a different gluten protein structure.

Does USDA Organic flour contain glyphosate?

USDA Organic certification prohibits glyphosate application but does not require non-detect residue testing. The 2018 Environmental Working Group testing found 5 of 16 organic oat products contained 10 to 30 parts per billion glyphosate, attributed to drift contamination from neighboring conventional fields. Detox Project certification, which requires non-detect at 10 ppb, is stricter than USDA Organic on this specific question.

What flour brands publish their residue testing?

Jovial Foods carries Detox Project glyphosate-residue-free certification publicly. Cairnspring Mills contractually prohibits glyphosate as a harvest aid but does not publish batch testing. Sunrise Flour Mill, Hayden Flour Mills, Anson Mills, Maine Grains, King Arthur, and Bob's Red Mill have varying degrees of practice transparency but limited public residue data. The published-residue-testing tier is small.

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