Roundup Causes Cancer Through DNA Damage

This in vitro study demonstrated that commercial Roundup formulations cause DNA damage in human cells through multiple mechanisms including direct genotoxicity, oxidative stress-mediated DNA strand breaks, and chromosomal aberrations. The study compared the effects of pure glyphosate versus the complete Roundup formulation on human lymphocytes and other cell types.

Results showed that Roundup formulations caused significantly more DNA damage than equivalent concentrations of pure glyphosate, confirming that co-formulants amplify the genotoxic effects. DNA damage was detected using the comet assay, micronucleus test, and chromosomal aberration analysis — all standard genotoxicity endpoints used in cancer risk assessment.

The DNA damage occurred at concentrations well below those encountered in agricultural and residential application scenarios, suggesting that real-world Roundup exposure carries meaningful genotoxic risk.

Key Findings

• •Roundup formulations caused significant DNA strand breaks in human lymphocytes as measured by the comet assay.
• •Micronucleus formation (a marker of chromosomal damage) was increased in Roundup-treated cells.
• •Complete Roundup formulations were more genotoxic than equivalent doses of pure glyphosate.
• •Oxidative stress-mediated DNA damage was a major mechanism, with elevated 8-OHdG levels.
• •DNA damage occurred at environmentally relevant concentrations below agricultural application levels.

Methodology

Human peripheral blood lymphocytes and other cell lines were exposed to serial dilutions of pure glyphosate and commercial Roundup formulations. Genotoxicity was assessed using the alkaline comet assay (DNA strand breaks), cytokinesis-block micronucleus assay (chromosomal damage), and chromosomal aberration analysis. Oxidative DNA damage was measured via 8-OHdG ELISA.

Why This Matters for Families

DNA damage is the fundamental initiating event in cancer development. This study shows that Roundup — a product millions of families have used in their yards — causes the type of DNA damage that leads to cancer. Families should immediately stop using Roundup products and switch to low-risk weed management methods.