Monsanto Knew & Lied About Glyphosate’s Harm to Humans
Of course, they want immunity from lawsuits!!!
Please call or email your KY Senator TODAY to OPPOSE SB199! There could be a first reading on the Senate floor today. More info here in yesterday’s post.
There is substantial evidence that Monsanto knew or should have known that glyphosate could be harmful to humans, based on internal documents and scientific reviews.
Internal documents revealed by investigative journalists and public interest groups show that Monsanto was aware of potential health risks associated with glyphosate as early as the 1970s. The company conducted internal toxicity studies on animals that showed kidney damage, organ changes, and tumor formation—evidence that was not fully disclosed to regulators.
In the 1980s and 1990s, EPA scientists identified glyphosate as a potential carcinogen, with findings of tumors in rats and mice. Despite this, the EPA eventually approved glyphosate for use, influenced by Monsanto’s submissions and lobbying efforts.
Ghostwritten studies were used to promote glyphosate’s safety. A landmark 2000 paper, published in Regulatory Toxicology and Pharmacology, claimed glyphosate posed no health risks to humans. This study was later revealed to be ghostwritten by Monsanto employees and based on unpublished internal data, while ignoring studies that showed carcinogenic effects.
In 2015, the World Health Organization’s International Agency for Research on Cancer (IARC) classified glyphosate as a “probable human carcinogen” (Group 2A). Monsanto responded by attempting to discredit the IARC report, even though internal documents showed the company had long known about the risks.
Multiple U.S. court rulings (e.g., Dewayne Johnson, Edwin Hardeman, and others) concluded that Monsanto failed to warn consumers about the cancer risks of Roundup, and that the company knew or recklessly disregarded the dangers.
In December 2025, a major study that had been used for decades to justify glyphosate’s safety was retracted due to ethical violations, including secret authorship by Monsanto employees and suppression of conflicting data.
These findings collectively indicate that Monsanto concealed or downplayed evidence of glyphosate’s harm for decades, despite internal knowledge of its potential dangers.
We must protect our lives, our children’s future, and our planet!
Resources:
https://www.sierraclub.org/sierra/monsanto-roundup-epa-corporate-political-influence
https://cancerwellness.com/monsanto-roundup-glyphosate-cancer/
https://www.cnn.com/2026/02/24/health/maha-trump-glyphosate-health
https://www.dw.com/en/did-monsanto-know-its-weed-killer-could-be-deadly-to-people/a-45116915
https://www.dw.com/en/did-monsanto-know-its-weed-killer-could-be-deadly-to-people/a-45116915