It looks like the American consumer has more to worry about than food recalls and cyclospora—a new study found that even the packaging the food comes in may pose some health concerns.

Out of over 15,000 food contact chemicals (FCCs), 1,222 or 8% can pose serious health risks, according to a recent study published in the peer-reviewed journal Environmental Science & Technology. Some of these FCCs, which in general are “substances that come into contact with food, such as through food packaging, processing, storage or other handling,” per the FDA, were found to be hazardous to human health.

Researchers from the nonprofit Food Packaging Forum Foundation, which conducted the study, found at least 2,160 chemicals regularly contact food and “migrate into foodstuffs.” Using guidelines from the UN’s Globally Harmonized System of Classification and Labeling of Chemicals (GHS), researchers found some of the chemicals related to food packaging and other materials were “carcinogenic, mutagenic, toxic to reproduction, harmful to specific organs after repeated exposure, [and] endocrine disrupting.”

That’s not the only concerning part. The researchers found that 13,211 of the 15,159 known food-contact chemicals lacked harmonized hazard data. That means the scientists could not determine from the available data whether those chemicals met the study’s criteria for being hazardous.