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While the majority of chemicals in cosmetics present slight or zero danger, some have been associated with severe medical problems, such as cancer, reproductive and neurological harm, and developmental delays. Chemicals in cosmetics invade the body through internal use, the skin, and inhalation, and pose similar risks as food chemicals, per this site.

Contaminants and chemicals linked to cancer are found in food and many other common items. But, no kind of consumer items is subject to less government direction than cosmetics and other personal products, including Clairol Professional Premium Crme - Neutrals Neutral for Resistant Grays - 2N Dark Neutral Brown base Neutral. Although most of the contaminants and chemicals in cosmetics almost certainly pose very little risk, being exposed to a few is linked to serious health issues, such as cancer.