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While many chemicals in beauty products pose very little or zero danger, several dozen have been associated with considerable medical conditions, including developmental delays and cancer. Cosmetic chemicals get into a person's body through ingestion, inhalation, and internal use, and cause similar problems as food chemicals, per this site.

Chemicals and contaminants linked to cancer can be found in food, water, and lots of other common items. Yet, no classification of consumer items is accountable to less government oversight than cosmetics, including Kiehl's Lip Balm SPF 15 Petrolatum Lip Protectant. While most of the chemicals in cosmetics and personal care products most likely pose minimal risk, subjection to a few is linked to significant health concerns, including cancer.