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Though many chemicals in cosmetic products pose minimal or absolutely no risk, some are linked with serious medical conditions, such as cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals get into the body through the skin, inhalation, ingestion and internal use, and lead to similar risks as food chemicals, per this site.

Chemicals and contaminants linked to cancer can be found in food and several other common items. Yet, no type of consumer items is subject to less government inspection than cosmetics, including Curious Britney Spears Write On! Perfumed Shimmer Stick. While most of the chemicals in cosmetics very likely present very little risk, subjection to a few has been linked to worrying health disorders, such as cancer.