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Though most chemicals in cosmetics pose very little or absolutely no threat, some have been linked with serious medical problems, including developmental delays and cancer. Cosmetic chemicals can enter the body through internal use, the skin, and inhalation, and pose the same problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in food and lots of other ordinary products. However, no category of consumer products is susceptible to less government inspection than cosmetics and other personal products, including SPF 45. Although most of the chemicals and contaminants in cosmetics and personal care products very likely pose minimal risk, being exposed to some is associated with substantial health disorders, such as cancer.