I'm using brown hair dye for years. Can hair dye cause health risks?
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replied July 28th, 2017
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Modern hair dyes are classified as permanent (or oxidative), semipermanent, and temporary. Permanent hair dyes, which make up about 80% of currently marketed products, consist of colorless dye “intermediates” (chemicals called aromatic amines) and dye “couplers.” In the presence of hydrogen peroxide, the intermediates and couplers react with one another to form pigment molecules. Darker colors are formed by using higher concentrations of intermediates. Semipermanent and temporary hair dyes are nonoxidative and include colored compounds that stain hair directly.

Over 5,000 different chemicals are used in hair dye products, some of which are reported to be carcinogenic (cancer-causing) in animals.

Although some studies have linked the personal use of hair dyes with increased risks of certain cancers of the blood and bone marrow, such as non-Hodgkin lymphoma (NHL) and leukemia, other studies have not shown such links. Studies of breast and bladder cancer have also produced conflicting results. But there has not been any conclusive evidence to conclude that use of hair dyes can result in cancer.


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