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While many chemicals in cosmetic products pose limited or absolutely no risk, dozens are linked to serious medical conditions, such as cancer, and neurological harm. Cosmetic chemicals enter a person's body through internal use, the skin, and inhalation, and cause the same problems as food chemicals, per this site.

Chemicals and contaminants linked to cancer can be found in food and lots of other common goods. Still, no category of consumer goods is subject to less government direction than cosmetics, including Brush-On Gel Overlay. Though most of the chemicals in cosmetics most likely pose little risk, exposure to some is linked to worrying health concerns, including cancer.