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While most chemicals in beauty products present hardly any or zero threat, some have been associated to serious health problems, including developmental delays and cancer. Cosmetic chemicals can enter a person's body through the skin and inhalation, and lead to the same problems as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in water, food, and lots of other ordinary items. Still, no type of consumer items is accountable to less government oversight than cosmetics, including Stars. Although most of the chemicals in cosmetics probably present very little risk, subjection to some has been associated with significant health problems, including cancer.