The short answer
Glyphosate is a widely used weedkiller. IARC calls it a probable carcinogen linked to non-Hodgkin lymphoma, while the EPA concluded it is not likely to cause cancer at typical exposures. This scientific disagreement is a good example of hazard versus risk.
Glyphosate is classified as a probable human carcinogen (IARC Group 2A).
People are mainly exposed by applying weedkillers or, at low levels, through food residues.
It is most strongly linked to a debated possible link to non-Hodgkin lymphoma.
A carcinogen classification describes hazard — whether something can cause cancer — not your personal risk at a given exposure.
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The full explanation.
The simple version
Glyphosate is the active ingredient in many common weedkillers. Expert groups disagree about its cancer risk: one WHO agency calls it a "probable" carcinogen, while the U.S. EPA and several others concluded it is not likely to cause cancer at normal exposure levels. This is a real, unsettled scientific debate.
What glyphosate is
Glyphosate is the world's most widely used herbicide, applied in farming, landscaping, and home gardening. In 2015, IARC classified it as probably carcinogenic (Group 2A), citing limited human evidence for non-Hodgkin lymphoma. The EPA and the European Food Safety Authority reached different conclusions, finding it unlikely to pose a cancer risk at expected exposures.
How people are exposed
Common ways people come into contact with it:
- Applying glyphosate-based weedkillers in farming or gardening
- Trace residues on some foods
- Living or working near heavily sprayed areas
The cancer connection
IARC links glyphosate most closely to non-Hodgkin lymphoma. The NCI-led Agricultural Health Study of pesticide applicators did not find a clear increase in overall cancer risk, and the EPA concluded it is not likely to be carcinogenic to humans. The evidence remains debated.
The International Agency for Research on Cancer (IARC), the cancer arm of the World Health Organization, places glyphosate in Group 2A, probably carcinogenic to humans — meaning the evidence in people is limited but there is strong support from animal or mechanistic studies (evaluated in 2015).
Hazard is not the same as risk
It helps to separate two ideas that are easy to mix up: hazard and risk. When an agency lists glyphosate as a carcinogen, it is making a statement about hazard — whether the substance is capable of causing cancer under some conditions. It is not, by itself, a statement about your personal risk, which depends on how much you are exposed to, for how long, and other factors. Two substances in the same group can carry very different real-world risks. The label answers "can it cause cancer?" — not "how likely is it to cause cancer for me?"
How to lower your exposure
- Follow label directions and wear gloves and protection when applying
- Consider manual weeding or alternatives for home use
- Wash produce and eat a varied diet
- Reduce time in freshly sprayed areas
If you are looking at your overall cancer risk, small, steady steps add up. See our overview of cancer prevention and what raises cancer risk to put any single exposure in context.
The bottom line
Glyphosate is a probable human carcinogen (IARC Group 2A). The most important thing you can do is understand where exposure comes from and take reasonable steps to reduce it, without losing sleep over a single label. Focus your energy on the biggest, most controllable risks in your own life.
Words to know
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Common questions
▸Does glyphosate cause cancer?
Probably. Glyphosate is classified as a probable human carcinogen: the evidence in people is limited, but animal and laboratory studies support a link. "Probable" means suspected on solid grounds, not proven.
▸How are people exposed to glyphosate?
Most exposure happens by applying weedkillers or, at low levels, through food residues.
▸Which cancers are linked to glyphosate?
It is most strongly linked to a debated possible link to non-Hodgkin lymphoma. Agencies genuinely disagree here, which is why glyphosate is a textbook example of how a hazard label can differ from real-world risk estimates.
▸How can I reduce my exposure to glyphosate?
The main steps are following label safety steps and considering alternatives at home.
▸Does a carcinogen label mean I will get cancer?
No. A classification is about hazard — whether glyphosate can cause cancer under some conditions — not a prediction that any one exposed person will develop cancer. Your actual risk depends on the amount and length of exposure and other factors.
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