Some ingredients release Formaldehyde, which is linked to cancer. The EPA classifies it as a possible carcinogen. The following ingredients either release or breakdown into Formaldehyde:

• bronopol (or 2-brono-2-nitropropane-1,3-diol)
• diazolidinyl urea
• DMDM hydantion
• imidazolidinyl urea
• quaternium 15

In a study conducted by the Campaign for Safe Cosmetics on 28 children’s skin care products, 23 (or 82%) contained Formaldehyde at levels between 54-610ppm.