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Although most chemicals in cosmetic products present slight or no threat, several dozen are linked with considerable health problems, including neurological harm and cancer. Cosmetic chemicals can enter the body through ingestion, inhalation, and internal use, and lead to similar risks as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in water, food, and lots of other everyday products. However, no group of consumer products is subject to less government oversight than cosmetics, including French Manicure Pen. Although many of the chemicals and contaminants in cosmetics most likely pose minimal risk, exposure to some has been associated with worrying health conditions, including cancer.