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While many chemicals in beauty products present very little or no danger, some have been linked with substantial health problems, including cancer, reproductive and neurological harm, and developmental delays. Chemicals in cosmetics get into a person's body through the skin and inhalation, and lead to the same problems as food chemicals, per this site.

Chemicals linked to cancer are found in food and several other ordinary items. However, no group of consumer items is accountable to less government oversight than cosmetics and other personal products, including Mineral Powder Foundation SPF 15 (4C). Though most of the chemicals and contaminants in cosmetics likely pose little risk, exposure to a few is linked to substantial health concerns, including cancer.