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Though the majority of chemicals in beauty products and cosmetics present minimal or zero danger, some have been associated with serious medical problems, including cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals can enter a person's body through internal use, the skin, and inhalation, and cause the same problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer can be found in water, food, and various other ordinary products. Still, no kind of consumer products is susceptible to less government oversight than cosmetics and other personal care products, including Copper. While many of the chemicals and contaminants in cosmetics and personal care products probably pose very little risk, exposure to a few is associated with major health problems, such as cancer.