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While most chemicals in beauty products pose hardly any or zero threat, several dozen have been linked to considerable health issues, including developmental delays and cancer. Cosmetic chemicals invade a person's body through internal use, the skin, and inhalation, and cause similar problems as food chemicals, per this site.

Chemicals associated with cancer are found in food and many other commonly used products. Still, no area of consumer products is subject to less government management than cosmetics, including Holy Cow-girl. While most of the chemicals and contaminants in cosmetics and personal care products in all likelihood pose very little risk, exposure to some is associated with significant health problems, including cancer.