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Organic Consumers Association

Campaigning for health, justice, sustainability, peace, and democracy

Tortilla Trouble

Maseca, the leading global brand of Mexican corn flours, plainly states on its website:

“MASECA is made of 100% natural corn and is vital for the good diet, its high nutritional value and is synonym of health and energy.”

And yet, our tests show that samples of both white and yellow Maseca brand flours contain traces of Monsanto’s Roundup weedkiller. Tests also show that most of the flours are made with GMO corn.

That’s bad news for U.S. consumers. It’s even worse news for consumers in Mexico, who might rightly assume that the Mexican brand of corn flour they use to make tortillas wouldn’t be made from GMO corn—because open-field growing of GMO corn is prohibited in Mexico.

Read our press release on Maseca test results

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