Roundup (Glyphosate Weed Killer)

Roundup is a line of herbicides sold by Monsanto, which Bayer bought in 2018. For decades its active ingredient was glyphosate, a chemical that kills most plants by blocking an enzyme they need to grow. It is sold to farmers, lawn care crews, and homeowners.

Regulators disagree about cancer risk. The International Agency for Research on Cancer classified glyphosate as "probably carcinogenic to humans," while the U.S. Environmental Protection Agency concluded in its 2017 assessment that glyphosate is not likely to be carcinogenic to humans, and says it is updating that evaluation as part of its ongoing review. That split is what the lawsuits are about.

Tens of thousands of people who developed non-Hodgkin lymphoma after years of using Roundup sued, arguing Monsanto should have warned about cancer on the label. Juries returned several large verdicts. Two 2026 events changed the picture. On June 25, 2026, the U.S. Supreme Court ruled 7 to 2 in Monsanto Co. v. Durnell (No. 24-1068) that federal pesticide law preempts a state failure-to-warn claim seeking a cancer warning the EPA did not require, reversing a $1.25 million verdict. Separately, a proposed class settlement in Missouri state court that received preliminary approval in March 2026 would pay up to $7.25 billion over as long as 21 years to current claimants and people diagnosed later.

If you used Roundup regularly and were diagnosed with non-Hodgkin lymphoma, the settlement terms and deadlines matter more now than ever. Our Roundup cancer lawsuit page tracks where things stand, and the separate Roundup concentrate settlement covers a different, purchase-based claim. For how thousands of injury cases are grouped, see class action vs. mass tort.