Hundreds of environmental scientists issued a warning about commonly used chemicals known as PFASs, which can be found in a variety of products, including pizza boxes.

The scientists advised that perfluorinated chemicals need further testing to determine if they are safe. PFASs can show up in many products labeled "stain-resistant," "waterproof" or "nonstick," including clothing, housewares, electronics, carpets and furniture.

"Research is needed to understand the potential for adverse health effects from exposure to the short-chain PFASs, especially regarding low-dose endocrine disruption and immunotoxicity," the authors of the study, Linda S. Birnbaum, from the National Institute of Environmental Health Sciences and National Toxicology Program, and Philippe Grandjean, from the Harvard School of Public Health, wrote.

A previous type of PFAS is no longer in use because some studies linked it to an increased risk of cancer.

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