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While most chemicals in cosmetic products present slight or no risk, several have been associated with severe health conditions, such as cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals invade a person's body through the skin, inhalation, ingestion and internal use, and cause the same dangers as food chemicals, per this site.

Chemicals and contaminants associated with cancer are found in water, food, and various other commonly used items. However, no classification of consumer items is accountable to less government oversight than cosmetics and other personal care products, including Tanzanite. Though many of the contaminants and chemicals in cosmetics in all likelihood present little risk, being exposed to some is associated with worrying health disorders, including cancer.