Bayer, Roundup, and the "Weed"
There's a connection between the chemical your garden centre sells you to kill dandelions and the reasons dandelions might be worth keeping.
WARNING: It's not subtle, and once you see it, you can't unsee it.
Who Bayer Are and How They Ended Up Here
Bayer is a German pharmaceutical and life sciences company founded in 1863, best known historically for inventing aspirin. Today, it's one of the world's largest pharmaceutical and agrochemical corporations.
Roundup was a brand name originally produced by Monsanto. In 1970, a Monsanto scientist named John Franz synthesised glyphosate and discovered its herbicidal properties. Monsanto brought it to market as Roundup in 1974. Bayer completed its acquisition of Monsanto in June 2018 for $63 billion, largely driven by the value of Monsanto's seed and biotechnology assets, especially Roundup, which remains by far the highest-selling and most profitable pesticide in history.
What Bayer didn't fully account for, or chose to absorb as a calculated risk, was the legal catastrophe it was buying along with it.
How Roundup Actually Works
Glyphosate works by binding to an enzyme present in all plant cells, one that animals don't have, which is responsible for producing essential amino acids for growth. Basically, disrupt that enzyme, and the plant dies. Because it targets something universal to plant biology, it kills everything green, essentially: weeds or crops alike. This is why Monsanto simultaneously developed and sold genetically modified "Roundup Ready" seeds, crops engineered to resist glyphosate so farmers could drench entire fields and only the weeds would die.
Bayer continues selling those glyphosate-resistant seeds alongside the herbicide itself. The more Roundup gets used, the more glyphosate-resistant weeds evolve, which drives demand for, you guessed it, more Roundup. The company profits at every stage of that cycle.
Photo by Jonathan Cooper: https://www.pexels.com/photo/fertilizer-in-a-container-on-the-soil-in-the-garden-12247010/
Photo by Aleksander Dumała: https://www.pexels.com/photo/nawozenie-roslin-na-polu-20280085/
The Cancer Question
Glyphosate in Roundup has been classified as "probably carcinogenic to humans" by the International Agency for Research on Cancer, the cancer research arm of the World Health Organisation. The majority of Roundup cancer lawsuits involve non-Hodgkin's lymphoma, a blood cancer affecting white blood cell production. Research from the University of Washington found that glyphosate exposure may increase the risk of certain cancers by as much as 41%.
The lawsuits have been extraordinary in scale. Despite settling around 100,000 claims for approximately $11 billion, Bayer still faces roughly 65,000 active cases. In February 2026, it announced a $7.25 billion settlement to resolve current and future claims. In March 2025 alone, a Georgia jury awarded nearly $2.1 billion to a man who developed non-Hodgkin's lymphoma after using Roundup at home for two decades.
Bayer maintains its position that its products don't cause cancer, pointing to a 2020 EPA ruling that glyphosate is not a carcinogen. The IARC and the EPA are in scientific disagreement and have reached different conclusions from the same evidence base. What isn't in dispute is that juries across America, given the same evidence, have consistently found that Roundup played a role in people getting sick.
There's a particularly concerning detail about Bayer's corporate structure that is hard to ignore.
The company is also one of the world's leading pharmaceutical firms, and among its products are medications used to treat non-Hodgkin's lymphoma, the cancer most commonly linked to Roundup. One arm may be involved in causing the disease. The other profits from treating it.
Photo by KATRIN BOLOVTSOVA: https://www.pexels.com/photo/justice-figurine-on-table-6077091/
The Health Concerns Nobody Talks About
The cancer story gets the headlines. The rest of the research is arguably worse, and most people have never heard of it.
The gut.
A 2020 literature review found that glyphosate residues on food could cause dysbiosis (a disruption of the gut's bacterial balance), because the opportunistic pathogenic bacteria in the gut are more resistant to glyphosate than the beneficial ones we need. The same review connected glyphosate to celiac disease, inflammatory bowel disease, irritable bowel syndrome, and even anxiety and depression through its effects on the gut microbiome. Studies confirm that beneficial gut bacteria, including Lactobacillus and Bifidobacterium, are more susceptible to glyphosate than pathogenic bacteria like Clostridium perfringens and Salmonella. Glyphosate kills the good ones and leaves the bad ones standing.
The liver.
A 2025 review of more than 40 scientific studies found that glyphosate may significantly raise the risk of metabolic dysfunction-associated steatotic liver disease (an increasingly common chronic liver condition) even at low exposure levels. The damage pathways include inflammation, oxidative stress, and fibrosis. Small increases in exposure appear to compound over time, particularly for people who already have other risk factors.
Oxidative stress.
This is the underlying mechanism connecting most of the above. Glyphosate disrupts mitochondrial function, increasing the production of reactive oxygen species (the unstable molecules that damage cellular structures, DNA, and proteins). That oxidative damage is the thread running through the cancer risk, the liver disease, and the gut disruption. It's not separate problems; it's one mechanism expressing itself in multiple places.
Hormonal disruption.
Growing evidence suggests glyphosate interferes with normal endocrine function, with observed effects including hormonal imbalance, disruption of proteins involved in endocrine pathways, and, in some studies, effects that appear to be transmissible across generations.
As for how widespread this exposure is: research from the University of California San Diego found that between 1993–1996 and 2014–2016, the percentage of people testing positive for glyphosate in their urine rose by 500%, with actual levels spiking by 1,208%. Glyphosate use has continued rising since. The compound is in more bodies than most people realise.
Where Dandelions Come In
Every major health concern linked to glyphosate has a corresponding area where dandelion research shows measurable benefit. That's not a coincidence dressed up as a narrative; it's what the studies actually show.
On cancer and oxidative damage.
Glyphosate's carcinogenic risk operates partly through oxidative stress and free radical damage to cells. Dandelion contains multiple antioxidant compounds — flavonoids luteolin and quercetin, phenolic acids including chlorogenic and caffeic acid, and taraxasterol, which activates antioxidant defence systems and has been shown to increase glutathione levels — the liver's primary antioxidant — by up to 35% in some studies. Separate research has identified potential anti-cancer properties against liver, pancreatic, and breast cancer cells specifically.
On liver damage.
The overlap here is direct. Glyphosate damages the liver through oxidative stress, inflammation, and fibrosis. Preclinical studies have found that dandelion extracts protect against liver damage from toxic agents, including alcohol, carbon tetrachloride, and paracetamol. The primary active compound, taraxasterol, specifically modulates the inflammatory and oxidative stress pathways that glyphosate activates. Dandelion extracts also inhibit pro-inflammatory cytokines, including TNF-α and interleukin-6, the exact signalling molecules elevated by glyphosate-induced liver damage.
On gut microbiome damage.
Glyphosate preferentially destroys Lactobacillus and Bifidobacterium, the beneficial bacteria, while leaving harmful species intact. Dandelion root contains inulin, a prebiotic fibre that specifically feeds those same beneficial species. It also contains chlorogenic acid and rutin, which may help reduce insulin resistance and support how the liver handles blood sugar. The plant works in almost the exact opposite direction to glyphosate in the gut.
On oxidative stress and inflammation.
The antioxidant and anti-inflammatory properties of dandelion are among the best-documented aspects of the plant, underpinning its traditional use for immune function, metabolic support, and liver health. Modern research has confirmed the mechanism behind what herbalists have observed for centuries.
On hormonal health.
The research is less direct here, but dandelion's documented support of liver function is relevant — the liver is the primary site for metabolising and clearing excess hormones from the body. Supporting liver function supports hormonal balance, even if no study has drawn that line explicitly.
The Research Gap: and Why It Exists
You'll sometimes see the dandelion research qualified with the observation that most studies are animal or lab-based rather than large-scale human clinical trials. That's true. What that framing usually omits is why.
Large-scale clinical trials are extraordinarily expensive. The funding almost always comes from pharmaceutical companies, which require a return on that investment in the form of a patent. You cannot patent a dandelion. It grows in every garden in the country, costs nothing, and cannot be owned. There is no financial mechanism by which a corporation could fund a £50 million clinical trial on dandelion and recoup that investment, so the trial doesn't get funded.
As researchers at the National Institutes of Health have documented, large-scale human trials of unpatentable plant compounds are rare, not because the compounds don't work, but because the system that funds trials has no commercial interest in proving that they do. The pharmaceutical industry's entire profit model depends on exclusivity. A plant that anyone can pick for free is, structurally, incompatible with that model.
Bayer, to bring this full circle, sells both the herbicide that the research suggests is damaging your liver, gut, and immune system, and the medications used to treat at least one of the cancers that herbicide is linked to. Meanwhile, the plant growing in your garden that the research suggests addresses those same biological pathways has no corporate sponsor and never will.
The dandelion you've been poisoning is, by most available evidence, considerably better for you than the product you've been using to poison it. And it grows back every year regardless, which at this point seems almost pointed.
Love,
nousana.
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