Glyphosate Is in Your Tap Water. Here’s What It’s Doing to Your Gut.

The world’s most widely used herbicide was originally patented as an antibiotic. Let that sink in for a second. It’s called glyphosate. You probably know it as Roundup. And it has been detected in tap water supplies across the United States and Europe.

According to Simply Younger’s review of the glyphosate and microbiome research, the standard “safe for humans” argument for glyphosate contains a fundamental flaw — one that most people have never been told about.

How Glyphosate Works — And Why the “Safe for Humans” Argument Falls Apart

Glyphosate works by disrupting the shikimate pathway — essentially starving plants of the amino acids they need to survive. For decades the official position was simple: glyphosate is safe for humans because it targets a pathway we don’t have. The shikimate pathway doesn’t exist in human cells.

Except that argument completely ignored something fundamental. We are not just human cells. We are also approximately 38 trillion bacteria. And bacteria do have the shikimate pathway. Which means glyphosate — by its own mechanism of action — is toxic to the bacteria that make up your gut microbiome. This isn’t a fringe theory. This is the basic biochemistry of how the chemical works, applied logically to the microbiome.

What the Research Shows

A 2020 study published in Environmental Health found that glyphosate exposure was associated with significant disruption to gut microbiome composition — reducing populations of beneficial bacteria while allowing more resistant strains to dominate. The downstream effects of that kind of gut dysbiosis are among the most studied areas in modern medicine: weakened immunity, chronic inflammation, mental health disruption, autoimmune conditions, accelerated ageing.

In 2015 the International Agency for Research on Cancer — the cancer research arm of the WHO — classified glyphosate as a probable human carcinogen. Monsanto, later acquired by Bayer, has paid out over $10 billion in legal settlements to people claiming glyphosate exposure caused their cancer. And yet glyphosate remains the most widely used herbicide on the planet.

It’s in the Water Supply

An estimated 300 million pounds of glyphosate is applied to crops in the United States every year. It runs off into waterways. It leaches into groundwater. A 2022 US Geological Survey study found glyphosate in the majority of water samples tested — in rivers, streams, and groundwater sources that feed municipal supplies. Standard water treatment does not reliably remove glyphosate. The EPA sets a maximum contaminant level of 700 parts per billion — a limit many scientists consider far too high given the emerging evidence on microbiome effects at lower concentrations.

Nobody Asked You

You were never asked whether you wanted glyphosate in your water. It’s just there. In the water you drink every day. Doing what it was designed to do — disrupting the shikimate pathway in every living microorganism it encounters. Including the 38 trillion bacteria your health depends on. The question isn’t whether this is happening. The USGS data confirms it is. The question is whether you know what’s in your water and whether you’re doing anything about it.