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If you’re worried about exposing yourself to unsafe chemicals, here is something you should know. Permanent hair dyes aren’t safe, according to researchers at the University of Southern California. The risk of bladder cancer doubles for women who use permanent dyes at least once a month for one year, and triples for monthly users of 15 or more years. The risk goes up for barbers and hairdressers, too. For those folks who make us look good, the risk goes up by 50% after a year in their jobs and 500% after 10 years. Researchers report that semipermanent or temporary dyes don’t increase the risk at all.
(Source: Health Sciences Institute, Members Alert for January 2003, Vol.7, No.7)