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While the majority of chemicals in cosmetic products present limited or zero risk, several have been associated with substantial health problems, such as neurological harm and cancer. Cosmetic chemicals enter a person's body through inhalation, ingestion, and the skin, and lead to the same problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in water, food, and a lot of other common products. However, no classification of consumer products is susceptible to less government oversight than cosmetics and other personal products, including Oh What A Knight. While many of the chemicals and contaminants in cosmetics almost certainly present little risk, being exposed to a few has been associated with serious health problems, such as cancer.