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While most chemicals in beauty products and cosmetics pose hardly any or no danger, dozens have been linked with significant health problems, such as neurological harm and cancer. Cosmetic chemicals invade a person's body through inhalation, ingestion, and the skin, and pose the same dangers as food chemicals, per this site.

Chemicals associated with cancer can be found in food, water, and many other ordinary items. Yet, no classification of consumer items is susceptible to less government inspection than cosmetics and other personal products, including Niagara Falls for OPI. Though most of the chemicals in cosmetics in all likelihood present very little risk, exposure to a few has been associated with serious health conditions, such as cancer.