"Researchers from the University of Southern California's (USC) School of Medicine found in 2001 that women using permanent hair dye at least once a month more than double their risk of bladder cancer. If they used it monthly for more than 15 years, they tripled their risk. The risk of bladder cancer was highest among smokers who regularly used hair dyes."
In 2003 the FDA's National Center for Toxicological Research reported that it found a known carcinogen, 4-ABP, in eight of 11 hair dye products bought off the shelf at supermarkets and hair salons. It was not listed as a regular ingredient, but was likely a contaminant formed as a byproduct of the dye-making process according to the researchers.
More next time...
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