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While many chemicals in cosmetics pose little or absolutely no threat, several dozen have been associated to serious medical conditions, such as developmental delays and cancer. Chemicals in cosmetics invade a person's body through inhalation, ingestion, and the skin, and lead to the same dangers as food chemicals, per this site.

Contaminants and chemicals linked to cancer can be found in water, food, and various other commonly used goods. But, no category of consumer goods is susceptible to less government oversight than cosmetics and other personal products, including Perfectly Natural. While most of the contaminants and chemicals in cosmetics probably present very little risk, exposure to a few is linked to major health problems, including cancer.