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While the majority of chemicals in cosmetics present slight or zero threat, dozens have been associated to substantial health issues, including developmental delays and cancer. Chemicals in cosmetics can enter the body through ingestion, inhalation, and internal use, and cause the same problems as food chemicals, per this site.

Contaminants and chemicals linked to cancer are found in food and various other commonly used goods. However, no classification of consumer goods is subject to less government inspection than cosmetics, including No Spain, No Gain. Although many of the contaminants and chemicals in cosmetics most likely present very little risk, subjection to a few has been linked to major health concerns, such as cancer.