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Just because a Brazilian blow-out claims to be formaldehyde-free doesn't mean it's actually free of formaldehyde. The Occupational Safety & Health Administration (OSHA) has discovered that many hair-straightening products contain dissolved formaldehyde that has reacted chemically with other ingredients. According to the New York Daily Nnews, the carcinogen might be hiding in your hair treatment under a host of other names, including "methylene glycol, formalin, methylene oxide, paraform, formic aldehyde, methanal, oxomethane, oxymethylene, or CAS Number 50-00-0." [NYDN]
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