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While most chemicals in cosmetic products pose limited or no threat, several dozen are linked to severe health conditions, including developmental delays and cancer. Cosmetic chemicals gain entry to the body through inhalation, ingestion, and the skin, and pose similar dangers as food chemicals, per this site.

Chemicals linked to cancer can be found in water, food, and several other ordinary products. However, no group of consumer products is subject to less government management than cosmetics and other personal products, including Don't Be Such A Sourpuss. Though most of the chemicals and contaminants in cosmetics probably present minimal risk, exposure to some has been linked to substantial health issues, such as cancer.