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Although the majority of chemicals in cosmetic products pose slight or no threat, several have been linked with significant health issues, including developmental delays and cancer. Chemicals in cosmetics can enter the body through the skin, inhalation, ingestion and internal use, and lead to the same problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer can be found in water, food, and lots of other everyday products. However, no classification of consumer products is subject to less government direction than cosmetics, including No7 Protect & Perfect Advanced All in One Foundation. Though many of the chemicals and contaminants in cosmetics probably present very little risk, being exposed to some has been associated with substantial health concerns, such as cancer.