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While the majority of chemicals in cosmetic products pose slight or zero threat, several dozen are associated to significant medical problems, such as cancer, and neurological harm. Cosmetic chemicals get into the body through the skin, inhalation, ingestion and internal use, and pose similar problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer can be found in water, food, and a lot of other ordinary goods. Yet, no category of consumer goods is subject to less government oversight than cosmetics and other personal products, including MDSolarSciences SPF 40 Ultra-Sport Stick. While many of the contaminants and chemicals in cosmetics almost certainly pose very little risk, exposure to a few has been associated with major health disorders, including cancer.