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While most chemicals in cosmetic products present very little or zero risk, several have been associated with serious medical problems, such as neurological harm and cancer. Chemicals in cosmetics can enter a person's body through internal use, the skin, and inhalation, and lead to the same dangers as food chemicals, per this site.

Chemicals and contaminants associated with cancer are found in water, food, and lots of other everyday products. But, no kind of consumer products is subject to less government inspection than cosmetics and other personal products, including intense UV protection cream. Although most of the chemicals and contaminants in cosmetics and personal care products probably pose minimal risk, being exposed to a few is associated with significant health concerns, such as cancer.