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Though the majority of chemicals in cosmetics present minimal or zero threat, some have been linked to substantial health issues, such as cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals invade the body through ingestion, inhalation, and internal use, and cause similar dangers as food chemicals, per this site.

Chemicals linked to cancer are found in food and several other commonly used items. Still, no category of consumer items is subject to less government inspection than cosmetics, including NARS Powder Foundation. While most of the chemicals and contaminants in cosmetics almost certainly pose little risk, your exposure to some is linked to significant health issues, such as cancer.