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Though most chemicals in beauty products and cosmetics pose little or no risk, some are linked to considerable medical problems, such as developmental delays and cancer. Chemicals in cosmetics can enter a person's body through 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 food and a lot of other common items. Still, no group of consumer items is susceptible to less government inspection than cosmetics, including Ruby Red Slippers. Though most of the chemicals in cosmetics and personal care products very likely pose very little risk, being exposed to a few is associated with critical health concerns, such as cancer.