13 X increase of Glyphosate in urine in 23 years – JAMA Oct 2017

Excretion of the Herbicide Glyphosate in Older Adults Between 1993 and 2016

The herbicide Roundup is sprayed onto genetically modified crops and applied as a desiccant to most small non–genetically modified grains. Use of this herbicide has increased since 1994 when genetically modified crops were introduced in the United States. Glyphosate, the primary ingredient in the herbicide, is found in these crops at harvest.1 Environmental exposure through dietary intake of these crops has potential adverse health effects and can be assessed by measuring urinary excretion.2- 4 We measured excretion levels of glyphosate and its metabolite aminomethylphosphonic acid (AMPA) in participants from the Rancho Bernardo Study (RBS) of Healthy Aging. . . .

Note: now 70% of those tested have >level of detection

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Study was cited 120 times by May 2025

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