Organic All-Purpose Flours Tested for Toxic Glyphosate

Which organic all-purpose flours do NOT have detectable glyphosate, a very common toxic herbicide? Glyphosate is the active ingredient in “Roundup Ready” GMO crops and has been linked with cancer. If you want to avoid glyphosate and other hormone-disrupting chemicals, Mamavation is your one-stop shop for the safest food and products online. You’ve trusted Mamavation to bring you topics like (1) safest cooking oils tested for phthalates, (2) safest sourdough bread tested for glyphosate, (3) safest tea tested for PFAS, and (4) women’s multivitamins tested for pesticides, PFAS, heavy metals, & phthalates; now join us as we bring you organic all-purpose flour tested for glyphosate.

Disclosure: This consumer study is released in partnership with Environmental Health News. Donations were provided by Environmental Health News and Mamavation community members. Note that Mamavation has only “spot-checked” the industry and thus we cannot make predictions about brands and products that we have not tested. Products and manufacturing aides can change without notice, so buyer beware. This post contains affiliate links, most of which are to Amazon, which means Mamavation will receive a portion of those sales, and we will use that to pay ourselves back for the testing. You can also give a tax-deductible donation to our consumer studies here through Environmental Health Sciences. Thank you! All Mamavation testing data is proprietary. If you’re interested in referencing our data on your website or app, please reach out to discuss licensing agreements. Copyright © 2026 Mamavation — All Rights Reserved

Table of Contents

Glyphosate–A Powerful Toxic Herbicide That Has Taken Over World

Glyphosate [N-(phosphonomethyl) glycine] is the active ingredient in glyphosate-based herbicides (GBH) and is also the most popular herbicide in the world. Its environmental presence increased sharply after the introduction of “Roundup Ready” crops in 1996, which allowed glyphosate to be sprayed onto crops without killing them. Beyond agriculture, glyphosate is extensively used in landscaping, roadside maintenance, golf courses, and vegetation control in fire-prone areas.

Environmental exposure to this broad-based herbicide has increased dramatically since the introduction of “Round-up Ready” genetically modified (GMO) crops in 1996 for soybean, maize, and cotton varieties. “Round-up Ready” genetically modified crops made it possible to utilize glyphosate as a broadcast herbicide while not killing the crops they were sprayed on. Glyphosate is also extensively used in deforestation efforts, such as killing brush in fire zones, and is relied on heavily by landscapers to kill weeds in green belts and on golf courses. Ultimately, glyphosate is used to eliminate weeds and shrubs, including annual and perennial grasses, broadleaf weeds, and woody species.

Glyphosate is applied in a variety of forms: isopropylamine salt, ammonium salt, diammonium salt, dimethylammonium salt, and potassium salt. Thus, it’s important to understand that when glyphosate is applied to crops or weeds, it includes additional adjuvants in the formulation that make it more toxic and thus easier for plants to take up. These glyphosate formulations have also proven toxic to humans. However, companies don’t have to publicly disclose other proprietary chemicals in these herbicide formulations; therefore, regulators and researchers can’t fully study them to determine their health effects.

Glyphosate was originally patented as a chelator and an antibiotic, which means it binds minerals and interferes with microbial systems. These properties have fueled concern that long-term exposure may disrupt nutrient absorption, alter the gut microbiota, and increase antibiotic resistance. The World Health Organization (WHO) has classified glyphosate as a probable carcinogen, and California lists it under Proposition 65 for cancer and reproductive harm.

Because glyphosate is not an intentionally added ingredient, it does not appear on food labels. However, its absence from ingredient panels does not guarantee absence from the product itself. Contamination can occur through agricultural practices, raw material sourcing, manufacturing, transportation, or storage—making independent testing a critical safeguard.

Mamavation Finds Glyphosate in Organic Flour

To evaluate potential exposure, Mamavation sent ten all-purpose organic flours to an EPA-certified laboratory for testing. Samples were analyzed for glyphosate using liquid chromatography–mass spectrometry (LC-MS/MS) with a detection limit of 10 parts per billion (ppb), the lowest level routinely achievable in standardized commercial testing. While some academic laboratories may reach lower limits, those methods are not widely available or standardized for consumer product screening.

Here are the main findings:

90% of organic all-purpose flours did not contain detectable glyphosate. That’s 9 out of 10 organic flours.
100% of the organic einkorn flours we tested did not contain detectable glyphosate. That’s 2 out of 2 flours.
Only one brand had detectable glyphosate at 14 ppb, which is low enough to be reasonably considered as “drift” exposure

Why Is Glyphosate Found In Organic & Conventional Flour?

Glyphosate is a well-documented contaminant found in both conventional and organic flour. In conventional wheat, one major contributor is pre-harvest desiccation.

As explained by The Detox Project, farmers often spray glyphosate on crops late in the season, just before harvest. This application helps dry the plants more quickly and evenly, allowing them to be harvested earlier and reducing the time they spend in the field. While this saves farmers and food companies time and money, it comes at a potential cost to consumers.

Because glyphosate is highly persistent, it remains on the grain and can end up in food products at elevated levels. Our own testing of sourdough breads revealed numerous examples of this contamination.

As for organic food products, they’re significantly less likely to contain glyphosate residue; however, it does happen. It’s assumed that the vast majority of glyphosate contamination would come from pesticide drift from nearby conventional farms.

Comparing bread products tested in the past for glyphosate to sourdough bread products tested presently, you also start to see some differences in levels. More studies are needed on various bread products and their differences to make a stronger claim, but it appears that sourdough bread may be lower in glyphosate than other breads. For instance, two whole-wheat products were found to contain over 1,000 ppb of glyphosate in other studies. We did not find anything so high in our small study on Mamavation. 88% of the sourdough bread products we tested were under 50 ppb.

Because we have consistently found glyphosate in bread, we recommend that, if you want to avoid it, you start baking bread from scratch. This investigation will help you select the organic flour to use.

Other Investigations by Mamavation

Mamavation has conducted additional studies on glyphosate and other contaminants in our food supply. Here are some additional studies you may be interested in for your family:

More Glyphosate Testing

Small Kitchen Appliances

Mamavation’s Investigation of Organic All-Purpose Flour Details

Ten organic all-purpose flour products were mostly donated in May 2026 by community members. Each product was recorded in our database, pictures were taken, and the product was then sent directly to an EPA-certified laboratory in its original packaging. After the results were given, we spent some time analyzing the data to determine where to rank each product.

Product Brands We Tested

To help you make informed decisions about which organic flour products are safest for your home, we sent a range of popular organic all-purpose flour brands to our EPA-certified laboratory for testing. Each product was evaluated for glyphosate contamination. Below is the complete list of brands included in our investigation.

Brands Tested by Mamavation

365 Whole Foods Market Organic All-Purpose Flour
Arrowhead Mills Organic Unbleached All-Purpose Flour Milled from Premium Grade Hard Wheat
Bob’s Red Mill Unbleached White All-Purpose Organic Flour
Central Milling Organic All-Purpose Flour “Beehive” Unbleached Malted Flour
Grand Teton Ancient Grains Certified 100% Organic All-Purpose Einkorn Flour
Jovial Regeneratively Farmed 100% Organic Einkorn All-Purpose Flour
King Arthur Baking Company Unbleached All-Purpose Flour Organic
Kirkland Signature All-Purpose Flour Organic Unbleached Milled from Hard Red Wheat
Sunrise Flour Mill Heritage White Flour Organic Hard Red Wheat All Purpose Flour
Trader Joe’s Organic Unbleached All-Purpose Flour

Not Our Favorite Organic All-Purpose Flour

These USDA organic brands had detectable glyphosate via our EPA-certified laboratory.

Sunrise Flour Mill Heritage White Flour 100% Premium Organic Hard Red Wheat All-Purpose Flour — 14 ppb glyphosate

Better Organic All-Purpose Flour

No brands were put in this category

Best Organic All-Purpose Flour

These USDA organic brands did not have detectable glyphosate via our EPA-certified laboratory.

USDA Organic Stone-Milled Flour

Grand Teton Ancient Grains Certified 100% Organic All-Purpose Einkorn Flour — non-detect glyphosate

USDA Organic Roller-Milled Flour

365 Whole Foods Market Organic All-Purpose Flour — non-detect glyphosate
Arrowhead Mills Organic Unbleached All-Purpose Flour Milled from Premium Grade Hard Wheat — non-detect glyphosate
Bob’s Red Mill Unbleached White All-Purpose Organic Flour — non-detect glyphosate
Central Milling Organic All-Purpose Flour “Beehive” Unbleached Malted Flour — non-detect glyphosate
Jovial Regeneratively Farmed 100% Organic Einkorn All-Purpose Flour — non-detect glyphosate
King Arthur Baking Company Unbleached All-Purpose Flour Organic — non-detect glyphosate
Kirkland Signature All-Purpose Flour Organic Unbleached Milled from Hard Red Wheat — non-detect glyphosate
Trader Joe’s Organic Unbleached All-Purpose Flour — non-detect glyphosate