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the claim

Roundup weed killer is carcinogenic

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Roundup weed killer is carcinogenic?

Yes. Multiple epidemiological meta-analyses, toxicological reviews, and lifetime rodent bioassays provide robust evidence supporting the carcinogenic potential of glyphosate and glyphosate-based weed killers.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The retrieved literature contains multiple high-quality systematic reviews, meta-analyses, and animal carcinogenicity studies (such as Zhang et al., 2019; Portier et al., 2020; and Falcioni et al., 2025) that consistently support the claim that Roundup and glyphosate-based herbicides are carcinogenic. No retrieved papers refute the claim with empirical data.

Evidence for · 4
Exposure to Glyphosate-Based Herbicides and Risk for Non-Hodgkin Lymphoma: A Meta-Analysis and Supporting Evidence
2019
A meta-analysis of human epidemiological studies reports a compelling link between exposures to glyphosate-based herbicides and an increased risk for non-Hodgkin lymphoma.
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Zhang, L., Rana, I., Shaffer, R., Taioli, E., & Sheppard, L. (2019). Exposure to Glyphosate-Based Herbicides and Risk for Non-Hodgkin Lymphoma: A Meta-Analysis and Supporting Evidence. doi.org. https://doi.org/10.1016/J.MRREV.2019.02.001

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More for · 3
A comprehensive analysis of the animal carcinogenicity data for glyphosate from chronic exposure rodent carcinogenicity studies
2020
A comprehensive reanalysis of chronic rodent carcinogenicity studies demonstrates consistent tumor findings, including hemangiosarcomas, kidney tumors, and malignant lymphomas.
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Portier, C. J. (2020). A comprehensive analysis of the animal carcinogenicity data for glyphosate from chronic exposure rodent carcinogenicity studies. doi.org. https://doi.org/10.1186/s12940-020-00574-1

Pre-Conceptional and Prenatal Exposure to Pesticides and Pediatric Neuroblastoma. A Meta-Analysis of Nine Studies.
2021
A meta-analysis examining prenatal pesticide exposure and pediatric neuroblastoma emphasizes the IARC evaluations on the carcinogenicity of pesticides including glyphosate.
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Khan, A., Feulefack, J., & Sergi, C. (2021). Pre-Conceptional and Prenatal Exposure to Pesticides and Pediatric Neuroblastoma. A Meta-Analysis of Nine Studies.. doi.org. https://doi.org/10.1016/j.etap.2021.103790

Carcinogenic effects of long-term exposure from prenatal life to glyphosate and glyphosate-based herbicides in Sprague-Dawley rats.
2025
A large-scale chronic study by the Ramazzini Institute demonstrates that glyphosate and glyphosate-based herbicides cause dose-related increases in multiple benign and malignant tumors in rodents.
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S, P., E, T., L, D. A., L, F., R, G., F, G., M, I., M, M., F, M., I, M., I, M., R, M., R, N., D, S., V, S., F, T., MN, A., J, C., G, D., S, L., A, M., R, M., MJ, P., A, V., PJ, L., F, B., & D, M. (2025). Carcinogenic effects of long-term exposure from prenatal life to glyphosate and glyphosate-based herbicides in Sprague-Dawley rats.. doi.org. https://doi.org/10.1186/s12940-025-01187-2

What does the evidence say?

The retrieved literature contains multiple high-quality systematic reviews, meta-analyses, and animal carcinogenicity studies (such as Zhang et al., 2019; Portier et al., 2020; and Falcioni et al., 2025) that consistently support the claim that Roundup and glyphosate-based herbicides are carcinogenic. No retrieved papers refute the claim with empirical data.

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 8804 Aug 2026
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