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What we found: Formaldehyde releasers

Formaldehyde releasers were identified in 68 of 577, or nearly one in eight, of the hair products reviewed. 

Formaldehyde and formaldehyde releasers may be used in products to straighten hair or smooth curls. Formaldehyde is a known human carcinogen, identified as a cause of a rare type of throat cancer, and linked to leukemia. It also irritates the eyes, nose, and throat, and can cause contact dermatitis, which is an itchy skin rash from contact with an irritating substance. Formaldehyde is associated with asthma diagnosis and asthma symptoms in both children and adults.