Hair colouring safe with respect to cancer risk, finds BMJ study
Researchers have found in a new study that hair colouring is safe with respect to cancer risk.
Earlier studies have indicated that people who dye their hair regularly may have a higher risk of cancer, especially bladder cancer and breast cancer. Hair dyes contain certain chemicals that have been held responsible for these relationships. In the largest study to date, which followed 117,200 women from the USA over 36 years, this could not be confirmed.
A research team led by Eva Schernhammer, Head of the Department of Epidemiology at the Medical University of Vienna, showed in a specific analysis of the data from a cohort study of American nurses that regular hair colouring had no significant effect on most types of cancer - with a few exceptions. This study was published in the British Medical Journal.
The International Agency for Research on Cancer (IARC), part of the World Health Organization (WHO), has classified occupational exposure (e.g. hairdressers) to hair dyes as a probable human carcinogen, while personal use of hair dyes could not be classified. However, as current epidemiological evidence is far from conclusive, there is concern about the carcinogenic potential of personal use of permanent hair dye, especially those that are particularly aggressive and most commonly used.
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