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While many chemicals in cosmetic products pose minimal or zero threat, several are linked with substantial health problems, such as cancer, and neurological harm. Chemicals in cosmetics invade the body through ingestion, inhalation, and internal use, and cause similar dangers as food chemicals, per this site.

Chemicals and contaminants associated with cancer can be found in water, food, and many other commonly used products. However, no category of consumer products is susceptible to less government inspection than cosmetics and other personal care products, including SPF 15. Though many of the chemicals in cosmetics very likely present little risk, subjection to a few is associated with critical health concerns, including cancer.