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While many chemicals in beauty products present slight or zero risk, dozens have been associated to severe medical problems, such as cancer, and neurological harm. Chemicals in cosmetics invade your body through inhalation, ingestion, and the skin, and lead to the same problems as food chemicals, per this site.

Chemicals and contaminants associated with cancer can be found in water, food, and several other everyday products. But, no category of consumer products is subject to less government oversight than cosmetics, including Kiehl's Lip Balm SPF 15 Petrolatum Lip Protectant. While many of the chemicals in cosmetics likely present very little risk, subjection to some has been associated with critical health issues, such as cancer.