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While many chemicals in beauty products pose limited or no threat, several dozen are associated to serious health problems, such as cancer, and neurological harm. Chemicals in cosmetics invade the body through the skin, inhalation, ingestion and internal use, and cause similar risks as food chemicals, per this site.

Chemicals and contaminants linked to cancer are found in food, water, and lots of other commonly used products. Yet, no category of consumer products is susceptible to less government oversight than cosmetics, including French manucure pencil. Though most of the chemicals and contaminants in cosmetics and personal care products most likely present minimal risk, exposure to a few has been linked to worrying health conditions, such as cancer.