Formaldehyde-releasers decompose in the body to release formaldehyde, which is a directly cancer-causing carcinogen. Formaldehyde-releasers are irritants and can cause mucosal congestion, creating serious respiratory problems. You should look out for imidazolidinyl urea, methenamine, DMDM hydantoin, diazolidinyl urea and quartenium-15.
