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While most chemicals in beauty products and cosmetics pose slight or no threat, dozens are linked to serious medical issues, including cancer, and neurological harm. Chemicals in cosmetics invade a person's body through internal use, the skin, and inhalation, and pose similar problems as food chemicals, per this site.

Chemicals associated with cancer are found in food, water, and several other everyday products. Still, no category of consumer products is subject to less government oversight than cosmetics and other personal products, including NARS Lip Treatment. Though many of the chemicals and contaminants in cosmetics and personal care products most likely pose little risk, subjection to some is associated with serious health issues, such as cancer.