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Though most chemicals in cosmetics present very little or no risk, several dozen have been linked to significant medical problems, such as cancer, and neurological harm. Chemicals in cosmetics can enter a person's body through inhalation, ingestion, and the skin, and cause similar problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer can be found in water, food, and several other common items. However, no type of consumer items is subject to less government inspection than cosmetics, including Day Cream SPF 20. Although most of the chemicals and contaminants in cosmetics and personal care products probably pose minimal risk, your exposure to some is associated with major health issues, such as cancer.