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Although most chemicals in cosmetics pose little or absolutely no threat, dozens have been associated to significant medical conditions, including developmental delays and cancer. Cosmetic chemicals gain entry to the body through inhalation, ingestion, and the skin, and lead to similar risks as food chemicals, per this site.

Chemicals and contaminants linked to cancer can be found in food, water, and various other commonly used goods. But, no kind of consumer goods is susceptible to less government inspection than cosmetics, including Copper. Though most of the chemicals and contaminants in cosmetics probably present very little risk, being exposed to some is linked to major health issues, such as cancer.