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Though the majority of chemicals in cosmetic products present minimal or no risk, several have been linked with significant medical problems, such as cancer, reproductive and neurological harm, and developmental delays. Chemicals in cosmetics can enter a person's body through inhalation, the skin, and ingestion, and lead to the same risks as food chemicals, per this site.

Chemicals and contaminants associated with cancer are found in food and many other common items. But, no classification of consumer items is accountable to less government oversight than cosmetics, including Cobalt. While many of the chemicals in cosmetics and personal care products very likely pose very little risk, your exposure to a few has been associated with substantial health issues, including cancer.