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While the majority of chemicals in cosmetic products present hardly any or no risk, several dozen are linked to severe medical problems, such as cancer, and neurological harm. Cosmetic chemicals invade a person's body through the skin, inhalation, ingestion and internal use, and pose the same dangers as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in food, water, and several other commonly used products. Yet, no category of consumer products is accountable to less government direction than cosmetics, including Sally Hansen Thicken Up!. While many of the chemicals in cosmetics and personal care products in all likelihood present very little risk, exposure to some has been associated with critical health problems, including cancer.