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Though many chemicals in cosmetics present little or no danger, dozens have been associated to severe medical conditions, including cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals can enter the body through ingestion, inhalation, and internal use, and cause the same problems as food chemicals, per this site.

Chemicals and contaminants linked to cancer can be found in food and many other common goods. But, no classification of consumer goods is susceptible to less government management than cosmetics and other personal products, including Clairol Professional Premium Crme - Neutrals Neutral for Resistant Grays - 10N Lightest Neutral Blonde base Neutral. Though many of the contaminants and chemicals in cosmetics almost certainly present minimal risk, being exposed to some has been linked to critical health problems, including cancer.