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Though the majority of chemicals in cosmetics pose very little or zero threat, some have been associated with substantial health issues, including cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals enter a person's body through ingestion, inhalation, and internal use, and pose the same problems as food chemicals, per this site.

Chemicals linked to cancer are found in water, food, and many other everyday items. But, no group of consumer items is accountable to less government oversight than cosmetics, including Heracles. Although many of the contaminants and chemicals in cosmetics probably pose little risk, subjection to a few has been linked to worrying health concerns, including cancer.