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While most chemicals in cosmetics pose very little or zero threat, several dozen have been associated to considerable health issues, such as developmental delays and cancer. Cosmetic chemicals can enter the body through the skin and inhalation, and lead to similar risks as food chemicals, per this site.

Chemicals and contaminants associated with cancer can be found in food, water, and various other common products. However, no category of consumer products is subject to less government inspection than cosmetics, including Lithium. While many of the chemicals in cosmetics and personal care products likely present very little risk, your exposure to a few is associated with critical health disorders, such as cancer.