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While many chemicals in cosmetics present little or absolutely no risk, dozens have been associated with severe health problems, including cancer, reproductive and neurological harm, and developmental delays. Chemicals in cosmetics invade a person's body through the skin and inhalation, and pose the same problems as food chemicals, per this site.

Contaminants and chemicals linked to cancer are found in food, water, and several other ordinary goods. Still, no sector of consumer goods is susceptible to less government management than cosmetics and other personal products, including MDSolarSciences SPF 40 Ultra-Sport Stick. While most of the chemicals and contaminants in cosmetics in all likelihood pose little risk, exposure to a few is linked to critical health issues, including cancer.