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While most chemicals in cosmetics pose hardly any or zero risk, some are linked with severe medical issues, including cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals gain entry to a person's body through the skin and inhalation, and pose the same risks as food chemicals, per this site.

Chemicals linked to cancer can be found in food, water, and various other commonly used items. Still, no group of consumer items is subject to less government inspection than cosmetics and other personal care products, including Zinc. While many of the chemicals in cosmetics likely pose very little risk, your exposure to a few has been linked to significant health problems, including cancer.