Our current food chain is highly dependent on fertilizers and pesticides, but they also raise concerns about human health.

You might have sprayed it on dandelions or seen a neighbor use it on weeds in the driveway. If you live in the United States, you’ve almost certainly eaten food grown with it. Glyphosate, best known as Roundup, is the world’s most widely used weed killer. Right now, it’s at the heart of a legal battle that could change how companies are held responsible for the products they sell you.

The U.S. Supreme Court will decide if federal law can protect a company from lawsuits when people say a product made them sick, even if the government never required a warning label. Usually, legal questions like this don’t get much attention. But this case is different because it involves cancer, farming, and the food you eat. To see why it matters, it helps to know what glyphosate is and how it works.

What Glyphosate Does and Why Farmers Rely on It

Glyphosate kills weeds by blocking a chemical pathway that plants need to make essential proteins. Weeds sprayed with it usually die within one to three weeks. It does not affect animals in the same way, since humans and other mammals lack this specific pathway. This difference has been a key point in its defense.

For farmers, glyphosate has changed everything. Before it was widely used, weed control meant plowing fields over and over, using several different chemicals, or pulling weeds by hand. These methods were costly, took a lot of time, and damaged the soil.

Glyphosate gave farmers a single, affordable solution for almost any weed. Since the mid-1990s, genetically modified crops that can tolerate glyphosate have allowed farmers to spray entire fields without harming their crops. This change has reduced the need for tilling, which helps prevent soil erosion, lowers greenhouse gas emissions from farm equipment, and saves billions in production costs.

Glyphosate is used in many places besides farms. Cities spray it on roadsides and in parks. Railway workers use it to keep tracks clear. In many countries, it is the first choice for removing unwanted plants. Worldwide, sales of glyphosate-based products have reached over nine billion dollars in recent years, and demand is still growing.

Supporters of glyphosate, such as farm groups, officials from agricultural states, and even a recent presidential executive order, say that banning it would seriously harm food production. Research on a possible ban in Europe found that wheat yields could fall by up to 18 percent, and food production costs would rise sharply. Without glyphosate, farmers would have to use older herbicides with their own risks, plow fields more often, or accept smaller harvests. Each of these choices comes with its own problems.

What the Science Says About Health and the Environment

This is where things get complicated. Glyphosate doesn’t just stay on the weeds it is meant to kill. It spreads and can be found in soil, surface water, and groundwater. Studies have detected traces of glyphosate in children’s breakfast cereals, in beer, and in human urine, even in children as young as three. A large government survey from 2013 to 2018 found that 70 to 82 percent of Americans tested had detectable levels of glyphosate in their bodies.

When glyphosate breaks down in the environment, it produces a main byproduct called AMPA. Research shows that AMPA can harm red blood cells and cause genetic problems in some animals. Both glyphosate and AMPA have been found in groundwater and drinking water, especially in farming areas where they are used most.

Whether glyphosate causes cancer has been hotly debated for years. In 2015, the International Agency for Research on Cancer labeled it a probable human carcinogen, especially linking it to non-Hodgkin lymphoma. Thousands of lawsuits followed, and the company behind glyphosate has already paid billions in settlements.

A major international study published in 2025 gave rats glyphosate at doses regulators consider safe and found more tumors in all treatment groups. The researchers said these results strengthen the argument that glyphosate is a real cancer risk.

However, regulatory agencies such as the U.S. Environmental Protection Agency have reviewed glyphosate multiple times and concluded that it does not cause cancer when used as directed. Later, a federal court overturned one of those EPA reviews, saying the agency’s scientific process was flawed. Opponents in the current Supreme Court case point to this as proof that government approval is not always reliable.

Besides cancer, more research is linking glyphosate to other health issues. Some studies have found it can disrupt gut bacteria, which are important for digestion, immunity, and mental health. Research published in 2025 showed that people in rural areas exposed to glyphosate had lower birth weights and shorter pregnancies. Other studies have suggested possible links to neurological diseases, arthritis, and reproductive problems.

Many of these studies use animal models or examine large populations, so they don’t provide definitive proof in humans. The science is still developing, and researchers don’t all agree on how serious the risks are. It is the use of animal studies, which legal experts have found to be the weakest link in making the case against these types of pesticides.

Another problem is weed resistance. Years of heavy glyphosate use have led to the growth of ‘superweeds’ — plants that can survive glyphosate. Some estimates say more than 60 million acres of U.S. farmland now have these resistant weeds, so farmers must use more herbicides or add stronger chemicals. These trade-offs worry many agronomists.

Why the Supreme Court Case Matters to All of Us

The lawsuit before the court involves a cancer patient who used a glyphosate-based herbicide and later developed non-Hodgkin’s lymphoma. The main legal issue is not whether glyphosate caused the cancer, but who decides what warnings must appear on product labels.

The company argues that since the EPA didn’t require a cancer warning, it shouldn’t be held liable in court for omitting one. If the court agrees, it could stop many future lawsuits, not just against this company but also against other manufacturers whose products have federal approval without specific warnings. In essence, this would seem like we’re opening the barn door for everyone. A product that is later found to cause cancer and does not include an EPA-required warning would have no liability for any illness linked to its product.

Critics say this position would take away consumers’ rights to seek justice if they are harmed by products, and that it allows companies to avoid accountability through their ties with regulators, which can be influenced by politics. The implication here, of course, is that lobbyists played a significant role in drafting EPA regulations and eliminating warnings on specific product groups. Supporters argue that having different warning rules in each state would cause confusion, raise food prices, and could even remove a product that millions of farmers rely on from the market. Is the issue really a state-by-state regulation or an overall federal regulation regarding the environment and human health?

This issue is tough because both sides have valid arguments. Glyphosate has truly helped feed the world more efficiently and with less harm to soil than many older options. But there is growing evidence that it is not completely safe for people, pollinators, or water systems. The real challenge is not simply whether to use it or ban it, but how to balance years of agricultural benefits with health and environmental risks that we are still learning about.

No matter what the Supreme Court decides, the science questions will remain. Researchers are still looking at glyphosate’s long-term effects on gut bacteria, children’s development, and the ecosystems where it accumulates. This research will continue and will stay important. In the end, the real issue is not just about a weed killer. It is about who decides when a product is safe enough, and what happens if that decision is wrong.