Weedkiller products more toxic than their active ingredient, tests show

After more than 40 years of widespread use, new scientific tests show formulated weedkillers have higher rates of toxicity to human cells

US government researchers have uncovered evidence that some popular weedkilling products, like Monsanto's widely-used Roundup, are potentially more toxic to human cells than their active ingredient is by itself.

These "formulated" weedkillers are commonly used in agriculture, leaving residues in food and water, as well as public spaces such as golf courses, parks and children's playgrounds.