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While most chemicals in cosmetics pose very little or zero risk, dozens are associated to considerable medical conditions, including developmental delays and cancer. Cosmetic chemicals invade a person's body through the skin and inhalation, and pose similar risks as food chemicals, per this site.

Chemicals and contaminants associated with cancer can be found in food, water, and a lot of other commonly used products. Yet, no classification of consumer products is susceptible to less government inspection than cosmetics, including Gelish Soak-Off Gel Polish - Once Upon A Manicure. Though most of the chemicals in cosmetics almost certainly pose very little risk, being exposed to a few has been associated with significant health problems, including cancer.