Dr. Weil points out that, although manufacturers may claim "formaldehyde free", there are 9 other ingredients that are also formaldehyde according to OSHA, "methylene glycol, formalin, methylene oxide, paraform, formic aldehyde, methanal, oxomethane, oxymethylene, or CAS Number 50-00-0 are actually formaldehyde, according to OSHA's formaldehyde standard". These straightening solutions have been banned in Canada and have been recalled in Australia, Ireland, France, Germany and Cyprus.
http://www.drweil.com/drw/u/QAA40083...ing-Scare.html