Independent testing on an array of popular American food products found many samples contained residue levels of the weed killer called glyphosate, leading the nonprofit organization behind the testing to call for corporate and regulatory action to address consumer safety concerns.

The herbicide residues were found in cookies, crackers, popular cold cereals and chips commonly consumed by children and adults, according to Food Democracy Now and the group’s “Detox Project,” which arranged for the testing at the San Francisco-based Anresco lab. Anresco uses liquid chromatography tandem mass spectrometry (LC-MS/MS), a method widely considered by the scientific community and regulators as the most reliable for analyzing glyphosate residues.

The announcement of the private tests comes as the Food and Drug Administration (FDA) is struggling with its own efforts to analyze how much of the herbicide residues might be present in certain foods. Though the FDA routinely tests foods for other pesticide residues, it never tested for glyphosate until this year. The testing for glyphosate residues was recently suspended, however. Glyphosate is under particular scrutiny now because last year the World Health Organization’s International Agency for Research on Cancer (IARC) classified it as a probable human carcinogen. Glyphosate is the world’s most widely used herbicide and is the key ingredient in Monsanto Co.’s branded Roundup, as well as in hundreds of other products. The Environmental Protection Agency is now finalizing a risk assessment for glyphosate to determine if future use should be limited.