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Although most chemicals in beauty products pose limited or no risk, dozens have been linked with substantial medical problems, such as developmental delays and cancer. Chemicals in cosmetics enter a person's body through ingestion, inhalation, and internal use, and cause similar risks as food chemicals, per this site.

Chemicals linked to cancer can be found in water, food, and a lot of other ordinary goods. But, no kind of consumer goods is subject to less government oversight than cosmetics and other personal care products, including Zest Marathon Bar. While many of the chemicals and contaminants in cosmetics in all likelihood pose little risk, being exposed to a few has been linked to significant health problems, including cancer.