Herbicide Glyphosate Found in Organic Eggs and DairyANH-USA tested common breakfast foods for the presence of glyphosate, the toxic herbicide. Here’s what we found. Action Alert! By now it has become common knowledge that glyphosate, the active ingredient in Roundup—the most common weed killer in the world—poses many grave threats to human health and has been classified as a possible carcinogen by the World Health Organization. We also know that glyphosate is increasingly prevalent, turning up in blood, urine, and even breast milk. To dig deeper—to see just how pervasive glyphosate is in our food system—we tested twenty-four popular breakfast foods and ingredients, including items such as flour, corn flakes, bagels, yogurt, potatoes, organic eggs, and coffee creamers.