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While most chemicals in beauty products pose minimal or zero threat, several have been associated to severe medical problems, including developmental delays and cancer. Cosmetic chemicals can enter a person's body through the skin and inhalation, and pose similar problems as food chemicals, per this site.

Chemicals associated with cancer are found in food and lots of other commonly used items. Still, no kind of consumer items is susceptible to less government direction than cosmetics and other personal care products, including NARS Light Optimizing Primer. Though most of the contaminants and chemicals in cosmetics most likely pose minimal risk, your exposure to a few has been associated with critical health concerns, such as cancer.