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While many chemicals in cosmetic products present limited or absolutely no threat, several dozen are associated with severe health issues, such as cancer, and neurological harm. Chemicals in cosmetics enter the body through the skin, inhalation, ingestion and internal use, and pose the same risks as food chemicals, per this site.

Chemicals linked to cancer can be found in food, water, and many other commonly used goods. But, no category of consumer goods is accountable to less government direction than cosmetics, including Kiehl's Lip Balm SPF 15 Petrolatum Lip Protectant. Though most of the contaminants and chemicals in cosmetics and personal care products likely pose very little risk, being exposed to a few has been linked to worrying health issues, including cancer.