Published in the Environmental Health journal, this study found that low doses of glyphosate cause multiple types of cancer in rats, including rare and aggressive tumors. Scientists exposed rats to glyphosate and two commercial glyphosate-based weed killers at levels currently deemed safe by regulators. The results showed significant increases in both benign and malignant tumors across numerous organs and tissues, with some cancers occurring unusually early.
The research team observed rare malignancies such as leukemia, liver, ovarian, and nervous system cancers arising at a rate and timing unprecedented in historical control groups. Around 40 percent of leukemia-related deaths in the treated animals occurred before one year of age – equivalent to a human age of under 35-40 years. These findings add weight to the International Agency for Research on Cancer’s conclusion in 2015 that glyphosate is “probably carcinogenic to humans,” and align with earlier studies linking glyphosate exposure to various cancers and toxic effects, including microbiome disruption and endocrine toxicity.
The researchers say their evidence should prompt regulators worldwide to reconsider safety thresholds for glyphosate use. They also warn that the herbicide’s effects extend beyond cancer to potential neurodevelopmental harm, with future studies planned to explore links to neurological disorders.
To read how, to avoid billions of dollars in damages, Bayer is petitioning the United States Supreme Court to limit legal claims that its glyphosate-based weedkiller Roundup causes cancer, see this news story on our website.
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July 4, 2025International Study Reveals Glyphosate Weed Killers Cause Multiple Types of Cancer
News
A comprehensive carcinogenicity study on the world’s most used herbicide, glyphosate, involving scientists from Europe and the United States, has found that low doses of the controversial weed killer cause multiple types of cancer in rats.
[Source: medicalxpress.com]
[Image source: Adobe Stock]
Comment
Published in the Environmental Health journal, this study found that low doses of glyphosate cause multiple types of cancer in rats, including rare and aggressive tumors. Scientists exposed rats to glyphosate and two commercial glyphosate-based weed killers at levels currently deemed safe by regulators. The results showed significant increases in both benign and malignant tumors across numerous organs and tissues, with some cancers occurring unusually early.
The research team observed rare malignancies such as leukemia, liver, ovarian, and nervous system cancers arising at a rate and timing unprecedented in historical control groups. Around 40 percent of leukemia-related deaths in the treated animals occurred before one year of age – equivalent to a human age of under 35-40 years. These findings add weight to the International Agency for Research on Cancer’s conclusion in 2015 that glyphosate is “probably carcinogenic to humans,” and align with earlier studies linking glyphosate exposure to various cancers and toxic effects, including microbiome disruption and endocrine toxicity.
The researchers say their evidence should prompt regulators worldwide to reconsider safety thresholds for glyphosate use. They also warn that the herbicide’s effects extend beyond cancer to potential neurodevelopmental harm, with future studies planned to explore links to neurological disorders.
To read how, to avoid billions of dollars in damages, Bayer is petitioning the United States Supreme Court to limit legal claims that its glyphosate-based weedkiller Roundup causes cancer, see this news story on our website.
Dr. Rath Health Foundation
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