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Although most chemicals in cosmetics pose slight or zero risk, some have been linked to considerable medical conditions, such as cancer, and neurological harm. Cosmetic chemicals enter a person's body through the skin, inhalation, ingestion and internal use, and cause the same problems as food chemicals, per this site.

Chemicals and contaminants associated with cancer can be found in food and a lot of other commonly used items. Still, no category of consumer items is subject to less government inspection than cosmetics and other personal care products, including Deja Blue. While many of the chemicals and contaminants in cosmetics very likely present minimal risk, being exposed to some has been associated with worrying health disorders, such as cancer.