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Though most chemicals in beauty products pose hardly any or absolutely no risk, some have been associated to serious medical conditions, including neurological harm and cancer. Cosmetic chemicals invade your body through the skin, inhalation, ingestion and internal use, and cause the same problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in food and lots of other common items. However, no classification of consumer items is accountable to less government inspection than cosmetics, including Titanium dioxide. While many of the chemicals in cosmetics probably pose very little risk, being exposed to some has been associated with substantial health problems, such as cancer.