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Though many chemicals in cosmetic products pose hardly any or no danger, several dozen have been associated to serious medical conditions, including developmental delays and cancer. Cosmetic chemicals can enter the body through the skin and inhalation, and cause similar risks as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in food, water, and various other commonly used items. Still, no category of consumer items is subject to less government oversight than cosmetics, including Mineral Powder Foundation SPF 15 (9W). While most of the chemicals in cosmetics probably present minimal risk, your exposure to a few is associated with substantial health disorders, such as cancer.