Jordans – whose brands include Country Crisp and Crunchy Oats – has already stopped using recycled cardboard, while Kellogg’s and Weetabix say they are taking steps to reduce the risk to human health.
The alert was sparked when researchers in Switzerland found that mineral oils in printing ink from recycled newspapers used in cardboard can get into foods – even passing through protective inner plastic bags.
Brands of pasta and rice which are packaged in recycled cardboard could also pose a risk.
Dr Koni Grob, of the Food Safety Laboratory in Zurich, said toxicologists had linked the oils to inflammation of internal organs and even cancer, though he stressed that individual meals would contain only a tiny dose of the chemicals.
The BBC reported that cereal firm Jordans has stopped using recycled cardboard while other manufacturers are reducing levels of mineral oils in packaging.