Your toilet paper might give you cancer, according to scientists.

Experts from the University of Florida warn that your toilet paper could contain toxic “forever chemicals,” also known as per- and polyfluoroalkyl substances (PFAs), which have previously been linked to certain cancers and even low sperm count.

In the new study, published in Environmental Science & Technology Letters on Wednesday, researchers detected substances in toilet paper known as diPAPs, or perfluoroalkyl phosphate diester.

Those precursor compounds have the ability to become different kinds of PFAs, namely, a substance called PFOA, or perfluorooctanoic acid, which is potentially carcinogenic.