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While many chemicals in beauty products and cosmetics present limited or no risk, several dozen are linked to serious medical problems, including neurological harm and cancer. Cosmetic chemicals enter the body through ingestion, inhalation, and internal use, and pose the same risks as food chemicals, per this site.

Chemicals and contaminants associated with cancer are found in food, water, and a lot of other common items. Still, no area of consumer items is subject to less government inspection than cosmetics and other personal products, including Katelyn's Clothes. Though most of the chemicals and contaminants in cosmetics and personal care products almost certainly pose very little risk, being exposed to a few has been associated with critical health concerns, including cancer.