Research into an association between glyphosate and cancer in humans is very limited. Studies have shown large doses of the chemical may cause cancer in animals. But results from animal tests don’t always translate to the same results in humans.

Drug and chemical giant Bayer AG acquired Roundup’s original manufacturer, Monsanto, in 2018. Bayer’s glyphosate website touts “more than 800 rigorous studies” on glyphosate conducted for the United States, European and other regulators.

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It says these studies confirm glyphosate is not carcinogenic. But company emails from 2002 suggest no studies at that time had determined whether Roundup posed a cancer risk.

Cancer Risk Studies

A 2019 analysis published in the journal Mutation Research/Reviews in Mutation Research said evidence supports a link between exposure to glyphosate herbicides and a higher risk of non-Hodgkin lymphoma, a specific type of cancer.

The researchers conducted a meta-analysis of all published studies of glyphosate exposure in humans. They determined people who had been exposed to the largest amounts of the herbicide showed a 41 percent higher relative risk for the disease.

The research included a fresh look at 2018 data from the government-funded Agricultural Health Study. Monsanto had used that study to argue there was no association between glyphosate and the disease.