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Though many chemicals in cosmetics pose minimal or absolutely no threat, dozens have been associated with considerable medical problems, such as cancer, and neurological harm. Cosmetic chemicals get into a person's body through the skin, inhalation, ingestion and internal use, and pose the same dangers as food chemicals, per this site.

Chemicals and contaminants linked to cancer are found in water, food, and a lot of other commonly used items. Still, no group of consumer items is susceptible to less government oversight than cosmetics and other personal products, including No Makeup Foundation Serum SPF 20. While many of the chemicals in cosmetics probably present very little risk, exposure to some has been linked to worrying health issues, such as cancer.