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While most chemicals in cosmetic products pose slight or zero risk, dozens are linked to considerable health issues, such as cancer, reproductive and neurological harm, and developmental delays. Chemicals in cosmetics invade a person's body through the skin and inhalation, and lead to the same problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in food, water, and lots of other everyday items. Still, no area of consumer items is susceptible to less government oversight than cosmetics and other personal products, including Don't Worry, Be Brilliant. Though many of the chemicals in cosmetics and personal care products most likely pose very little risk, exposure to a few has been associated with serious health concerns, including cancer.