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While most chemicals in beauty products and cosmetics pose limited or no threat, some are associated to substantial medical issues, such as cancer, and neurological harm. Chemicals in cosmetics get into a person's body through the skin and inhalation, and pose the same risks as food chemicals, per this site.

Chemicals and contaminants associated with cancer are found in food and many other ordinary products. Still, no category of consumer products is subject to less government oversight than cosmetics and other personal care products, including Watch Your Step, Sister!. Though many of the chemicals and contaminants in cosmetics and personal care products almost certainly present little risk, exposure to a few has been associated with significant health problems, such as cancer.